Puede que hayas oído hablar de Spock, el framework basado en Groovy que te permite hacer tus tests Java más legibles y expresivos. Pero seguramente no hayas visto una comparación de código real de tests hechos en librerías de test típicas como son JUnit y Mockito y cómo se harían en Spock, algo que realmente te haga consciente de lo que ganas, y lo que pierdes, al hacer tus tests con Spock.
En esta charla no solo mostraremos eso, sino que repasaremos algunas recomendaciones de buenas prácticas típicas para los tests unitarios o de integración en Java, y veremos cómo se ven afectadas al usar Spock. Cómo algunas pierden importancia y hasta sentido, y otras nuevas aparecen para reemplazarlas. Cómo ahora puedes pensar más en el qué que en el cómo, cómo todo es más sencillo. Y cómo pierdes también cosas por el camino.
¿Te atreves a cambiar la forma de hacer tus tests?
The document discusses property-based testing and how it can be used to test code more effectively than example-based testing. It introduces the concepts of testing properties like commutativity, associativity, and identity to specify requirements at a deeper level. QuickCheck is presented as a tool that generates random test values to check properties, finding bugs more quickly than testing by hand. JUnit Quickcheck and JSVerify are given as libraries for implementing property tests in Java and JavaScript. Potential applications of property testing like testing SDKs and data processing frameworks are outlined.
This document contains code snippets and explanations for 5 questions on structured programming in C++. Question 1 involves writing a program to determine if a number is odd or even. Question 2 prints a multiplication table as a lower triangular matrix using different loop structures. Question 3 solves quadratic equations. Question 4 finds the mean of N numbers using various loops. Question 5 calculates the sum of even and odd numbers up to N using different loops. The document provides the code and output for each question using different loop structures like for, while, and do-while loops.
The document discusses new features in C# 8 including readonly members, default interface methods, pattern matching with switch expressions and property patterns, using declarations, static local functions, asynchronous streams with IAsyncEnumerable, and null-coalescing assignment. Some key features covered are readonly members to prevent modification of struct fields and methods, default interface methods to provide implementation in interfaces, switch expressions as a cleaner alternative to switch statements, and property patterns for matching on property values in a switch expression.
This document contains C++ code and output to evaluate definite integrals using numerical integration methods like the Trapezoidal rule, Simpson's 1/3 rule, and Simpson's 3/8 rule. It includes 7 questions that provide code to integrate functions like exp(x), 1/(1+x^2), and sin(x)+cos(x) over different intervals. The code demonstrates how to implement the different numerical integration techniques to compute approximations of definite integrals and compare the results to exact solutions where available.
The document provides examples of using friend functions in C++.
In the first example, a friend function "add()" is declared and defined to access private members of class "Sum" to add two numbers. The second example demonstrates how a friend function "fun()" can access private members of two different classes "A" and "B". The third example shows how a static member function and static data member can be accessed using the class name and scope resolution operator.
This document contains code snippets from a structured programming tutorial/lab assignment. It includes 5 questions that involve printing text, performing basic math operations on hardcoded and user-inputted values, and converting floating point numbers to integers using different rounding methods. For each question, the code to solve it is provided along with example outputs.
This document contains the code solutions to 6 questions on structured programming techniques in C++. It demonstrates the use of different loop structures like while and for loops to calculate the area and perimeter of a rectangle, convert inches to centimeters, determine if a user is a child, adult or senior citizen based on age, calculate factorials of a given number, find the sum of first N natural numbers, and calculate the sum of squares of a given number. For each question, multiple solutions using different loop types are provided along with sample outputs.
The document discusses property-based testing and how it can be used to test code more effectively than example-based testing. It introduces the concepts of testing properties like commutativity, associativity, and identity to specify requirements at a deeper level. QuickCheck is presented as a tool that generates random test values to check properties, finding bugs more quickly than testing by hand. JUnit Quickcheck and JSVerify are given as libraries for implementing property tests in Java and JavaScript. Potential applications of property testing like testing SDKs and data processing frameworks are outlined.
This document contains code snippets and explanations for 5 questions on structured programming in C++. Question 1 involves writing a program to determine if a number is odd or even. Question 2 prints a multiplication table as a lower triangular matrix using different loop structures. Question 3 solves quadratic equations. Question 4 finds the mean of N numbers using various loops. Question 5 calculates the sum of even and odd numbers up to N using different loops. The document provides the code and output for each question using different loop structures like for, while, and do-while loops.
The document discusses new features in C# 8 including readonly members, default interface methods, pattern matching with switch expressions and property patterns, using declarations, static local functions, asynchronous streams with IAsyncEnumerable, and null-coalescing assignment. Some key features covered are readonly members to prevent modification of struct fields and methods, default interface methods to provide implementation in interfaces, switch expressions as a cleaner alternative to switch statements, and property patterns for matching on property values in a switch expression.
This document contains C++ code and output to evaluate definite integrals using numerical integration methods like the Trapezoidal rule, Simpson's 1/3 rule, and Simpson's 3/8 rule. It includes 7 questions that provide code to integrate functions like exp(x), 1/(1+x^2), and sin(x)+cos(x) over different intervals. The code demonstrates how to implement the different numerical integration techniques to compute approximations of definite integrals and compare the results to exact solutions where available.
The document provides examples of using friend functions in C++.
In the first example, a friend function "add()" is declared and defined to access private members of class "Sum" to add two numbers. The second example demonstrates how a friend function "fun()" can access private members of two different classes "A" and "B". The third example shows how a static member function and static data member can be accessed using the class name and scope resolution operator.
This document contains code snippets from a structured programming tutorial/lab assignment. It includes 5 questions that involve printing text, performing basic math operations on hardcoded and user-inputted values, and converting floating point numbers to integers using different rounding methods. For each question, the code to solve it is provided along with example outputs.
This document contains the code solutions to 6 questions on structured programming techniques in C++. It demonstrates the use of different loop structures like while and for loops to calculate the area and perimeter of a rectangle, convert inches to centimeters, determine if a user is a child, adult or senior citizen based on age, calculate factorials of a given number, find the sum of first N natural numbers, and calculate the sum of squares of a given number. For each question, multiple solutions using different loop types are provided along with sample outputs.
This document discusses strategies for throwing better exceptions in code. It presents examples of poorly thrown exceptions and demonstrates how to improve them by including more context and details. The key rules discussed are to use variable values, wrap bad exceptions, provide context, show runtime details, include tl;dr examples, add extra information, and highlight root causes when throwing exceptions. This aims to give confused coders more guidance in debugging and understanding where errors are occurring.
The document contains examples demonstrating various object-oriented programming concepts in C++ including constructors, destructors, inheritance, polymorphism, operator overloading, templates, and more. Each example includes the code for a concept, the output of running the code, and a brief description.
This program implements Hamming code in C for error detection and correction. It takes in 4-bit data as input, encodes it using a generator matrix to add parity bits, prints the encoded data. It then decodes the received encoded data by calculating the syndrome using a parity check matrix, detects and corrects any errors by flipping the erroneous bit.
The document describes the objectives of a C++ lab course. It includes:
1. Designing classes with static members, methods with default arguments, and friend functions like a matrix and vector class.
2. Implementing a complex number class with operator overloading.
3. Implementing a matrix class with dynamic memory allocation.
4. Overloading new and delete operators for custom memory allocation.
5. Developing linked list and sorting algorithm templates.
Numerical solution of ordinary differential equations by using Runge-Kutta Method of Order Two and Runge-Kutta Method of Order Four
How to write the C++ codes?
This document contains C++ code to find roots of equations using the bisection method. It includes 4 questions:
1) Finds the root of x3 – 4x – 8.95 = 0 between 2 and 3 to 3 decimal places.
2) Finds the root of ex – 3x = 0 using bisection up to a specified number of iterations.
3) Defines a bisection function to find the root of f(x) = x6 – x – 1 = 0 within 0.001 accuracy.
4) Defines a bisection function to find the smallest positive root of a cubic equation ax3+bx2+cx+d=0 within an error tolerance of 10-6.
Here is a program to calculate the area of a ring using functions:
#include <iostream>
using namespace std;
// Function to calculate area of ring
double areaOfRing(double innerRadius, double outerRadius) {
return (M_PI * (outerRadius * outerRadius - innerRadius * innerRadius));
}
int main() {
double innerRadius, outerRadius;
// Get input from user
cout << "Enter inner radius of ring: ";
cin >> innerRadius;
cout << "Enter outer radius of ring: ";
cin >> outerRadius;
// Call function to calculate area
double area = areaOfRing(innerRadius, outerRadius);
//
This document contains code for a C++ program that manages traveler details. It includes functions for an administrator menu with options to display traveler lists, search, edit, and delete traveler details. There are also functions for a guest menu to input and display traveler details. Structures are used to store traveler information including name, destination, address, phone number, etc.
The document contains C++ code examples demonstrating various programming concepts like:
1. A program that takes input from the user, performs addition if the input letter is 'A' and prints output. Otherwise it prints invalid letter.
2. Multiple code snippets showing the use of for loops, if-else conditions, functions and arithmetic operations.
3. Code examples to find even/odd numbers in an array, check if a number is prime, calculate factorials, print multiplication tables and find the sum of numbers.
The document discusses promises and asynchronous programming in JavaScript. It provides examples of using promises to handle asynchronous operations and avoid callback hell. Key points include:
- Promises allow asynchronous operations to be written in a synchronous-looking way by chaining .then() and .catch() methods
- The await keyword pauses async function execution until a Promise is resolved or rejected
- Examples demonstrate promise basics like resolving, rejecting, chaining, and error handling
- Asynchronous operations like timeouts and requests still execute concurrently with promises and async/await
This document contains 17 programming problems and their solutions involving object oriented programming concepts like classes, objects, functions, arrays, pointers etc. The problems cover basic concepts like calculating factorial, checking prime number, Fibonacci series, arithmetic operations using menus. More advanced concepts covered include sorting, searching, function overloading, complex numbers, class/object concepts like constructors, destructors and member functions to maintain student records.
This document contains C program code examples for various programming problems. It is divided into 5 weeks. Some of the programs included are: exchanging values between two variables with and without a temporary variable, finding the sum of digits of a positive integer, generating factors of numbers, calculating the factorial of a number, computing the sine function as a series, generating the Fibonacci sequence, reversing digits of an integer, converting decimal to binary, octal and hexadecimal, calculating terms of a series, and performing basic mathematical operations based on user input. The document provides the code and output for each problem.
This document discusses metaprogramming in C++ and describes an RPC framework implemented using C++ templates and metaprogramming. It defines an interface called calc_interface for a calculator RPC with functions like add and signals like expr_evaluated. It shows how to define the interface using meta_functions, and how a client can invoke functions on the server while handling serialization, transport, and response deserialization. Key aspects covered include defining the interface, invoking functions from the client, argument checking, and verifying functions exist in the interface.
(Rx).NET' way of async programming (.NET summit 2017 Belarus)Stas Rivkin
The document discusses Rx.NET's approach to asynchronous programming using observables and operators. It begins with an introduction to Rx and observables, explaining how they allow pushing data rather than pulling it. It then demonstrates building observables from scratch by implementing the observer pattern directly. Finally, it shows how common Rx operators like Where and Select can be implemented to transform and filter observable sequences. The overall summary is that the document introduces the key concepts of Rx.NET through examples of building observables and operators from first principles in a push-based reactive style.
1. The document contains details of Pranav Ghildiyal, a class XII student. It includes a table of contents listing 24 programs with page numbers.
2. The programs cover concepts like arrays, structures, classes, inheritance, file handling, stacks, queues and more. Algorithms covered include sorting, searching and linked lists.
3. The document serves as an index for various C++ programs written by the student to demonstrate different concepts and data structures.
The document contains multiple C++ code examples for programming exercises. It includes code to generate and output matrices, sort vectors, loop through ranges printing values, and calculate averages of two digit numbers. Jefferson Caiza is listed as the student name for the programming course. The code examples demonstrate basic programming concepts like loops, arrays, conditionals, and math operations.
Twisted is an event-driven networking engine written in Python. It provides tools for developing asynchronous network applications and services. Some key features of Twisted include an asynchronous reactor framework, support for deferreds/promises, common network protocols and services implemented, and application framework for building services.
The document discusses C++ concepts like static data members, static member functions, static objects, constant data members, and constant member functions through examples. It includes code snippets demonstrating how to declare and use static data members and static member functions. It also shows examples of constant data members, constant member functions, and constant objects in C++.
The document contains 5 questions related to C++ programs for matrix and array operations:
1) Finding the average of numbers in an array
2) Finding the smallest number in a 1D array
3) Adding two matrices
4) Finding the transpose of a matrix
5) Multiplying two matrices (for 2x2 matrices and matrices up to 10x10)
Each question provides the full C++ code to implement the operation and sample input/output.
The document discusses pointers in C++. It defines a pointer as a special variable that stores the address of another variable of the same data type. It provides examples of declaring and accessing pointers, pointer arithmetic, pointers as function parameters and return types, pointers and arrays, pointers and strings, and pointers and structures. Key topics covered include pointer declaration and dereferencing operators, pointer arithmetic, self-referential structures, and using pointers to implement linked lists.
Write a Java program in which a method named digitSum that accepts a.pdfnaveenkumar29100
Winnebagel Corp. currently sells 20,000 motor homes per year at $58,000 each, and 7,000
luxury motor coaches per year at $95,000 each. The company wants to introduce a new portable
camper to fill out its product line; it hopes to sell 15,000 of these campers per year at $9,000
each. An independent consultant has determined that if Winnebagel introduces the new campers,
it should boost the sales of its existing motor homes by 2,300 units per year, and reduce the sales
of its motor coaches by 1,000 units per year. What is the amount to use as the annual sales figure
when evaluating this project? (Enter your answer in dollars, not millions of dollars, e.g.
1,234,567.)
Solution
Sales revenue from new portable camper = 15000*$9000 = $ 13,50,00,000 Additional sales
of motor homes = 2300*$58000 = $ 13,34,00,000 Decrease in sales of motor coaches =
1000*$95000 = $ -9,50,00,000 Annual sales figure for evaluating the project $
17,34,00,000.
Самые вкусные баги из игрового кода: как ошибаются наши коллеги-программисты ...DevGAMM Conference
Один из лучших способов снизить количество багов в играх – это показывать программистам, как не стоит писать код. В своём докладе я соберу самые вкусные и необычные ошибки, которые удалось найти в C++ и C# коде таких игр, как VVVVVV, Space Engineers, Command & Conquer, osu! и даже Doom. Я уверен, что каждый из слушателей обязательно узнает для себя что-то новое. В конце концов, это просто приятно – лично увидеть ошибки из кода знакомой и любимой игры!
This document discusses strategies for throwing better exceptions in code. It presents examples of poorly thrown exceptions and demonstrates how to improve them by including more context and details. The key rules discussed are to use variable values, wrap bad exceptions, provide context, show runtime details, include tl;dr examples, add extra information, and highlight root causes when throwing exceptions. This aims to give confused coders more guidance in debugging and understanding where errors are occurring.
The document contains examples demonstrating various object-oriented programming concepts in C++ including constructors, destructors, inheritance, polymorphism, operator overloading, templates, and more. Each example includes the code for a concept, the output of running the code, and a brief description.
This program implements Hamming code in C for error detection and correction. It takes in 4-bit data as input, encodes it using a generator matrix to add parity bits, prints the encoded data. It then decodes the received encoded data by calculating the syndrome using a parity check matrix, detects and corrects any errors by flipping the erroneous bit.
The document describes the objectives of a C++ lab course. It includes:
1. Designing classes with static members, methods with default arguments, and friend functions like a matrix and vector class.
2. Implementing a complex number class with operator overloading.
3. Implementing a matrix class with dynamic memory allocation.
4. Overloading new and delete operators for custom memory allocation.
5. Developing linked list and sorting algorithm templates.
Numerical solution of ordinary differential equations by using Runge-Kutta Method of Order Two and Runge-Kutta Method of Order Four
How to write the C++ codes?
This document contains C++ code to find roots of equations using the bisection method. It includes 4 questions:
1) Finds the root of x3 – 4x – 8.95 = 0 between 2 and 3 to 3 decimal places.
2) Finds the root of ex – 3x = 0 using bisection up to a specified number of iterations.
3) Defines a bisection function to find the root of f(x) = x6 – x – 1 = 0 within 0.001 accuracy.
4) Defines a bisection function to find the smallest positive root of a cubic equation ax3+bx2+cx+d=0 within an error tolerance of 10-6.
Here is a program to calculate the area of a ring using functions:
#include <iostream>
using namespace std;
// Function to calculate area of ring
double areaOfRing(double innerRadius, double outerRadius) {
return (M_PI * (outerRadius * outerRadius - innerRadius * innerRadius));
}
int main() {
double innerRadius, outerRadius;
// Get input from user
cout << "Enter inner radius of ring: ";
cin >> innerRadius;
cout << "Enter outer radius of ring: ";
cin >> outerRadius;
// Call function to calculate area
double area = areaOfRing(innerRadius, outerRadius);
//
This document contains code for a C++ program that manages traveler details. It includes functions for an administrator menu with options to display traveler lists, search, edit, and delete traveler details. There are also functions for a guest menu to input and display traveler details. Structures are used to store traveler information including name, destination, address, phone number, etc.
The document contains C++ code examples demonstrating various programming concepts like:
1. A program that takes input from the user, performs addition if the input letter is 'A' and prints output. Otherwise it prints invalid letter.
2. Multiple code snippets showing the use of for loops, if-else conditions, functions and arithmetic operations.
3. Code examples to find even/odd numbers in an array, check if a number is prime, calculate factorials, print multiplication tables and find the sum of numbers.
The document discusses promises and asynchronous programming in JavaScript. It provides examples of using promises to handle asynchronous operations and avoid callback hell. Key points include:
- Promises allow asynchronous operations to be written in a synchronous-looking way by chaining .then() and .catch() methods
- The await keyword pauses async function execution until a Promise is resolved or rejected
- Examples demonstrate promise basics like resolving, rejecting, chaining, and error handling
- Asynchronous operations like timeouts and requests still execute concurrently with promises and async/await
This document contains 17 programming problems and their solutions involving object oriented programming concepts like classes, objects, functions, arrays, pointers etc. The problems cover basic concepts like calculating factorial, checking prime number, Fibonacci series, arithmetic operations using menus. More advanced concepts covered include sorting, searching, function overloading, complex numbers, class/object concepts like constructors, destructors and member functions to maintain student records.
This document contains C program code examples for various programming problems. It is divided into 5 weeks. Some of the programs included are: exchanging values between two variables with and without a temporary variable, finding the sum of digits of a positive integer, generating factors of numbers, calculating the factorial of a number, computing the sine function as a series, generating the Fibonacci sequence, reversing digits of an integer, converting decimal to binary, octal and hexadecimal, calculating terms of a series, and performing basic mathematical operations based on user input. The document provides the code and output for each problem.
This document discusses metaprogramming in C++ and describes an RPC framework implemented using C++ templates and metaprogramming. It defines an interface called calc_interface for a calculator RPC with functions like add and signals like expr_evaluated. It shows how to define the interface using meta_functions, and how a client can invoke functions on the server while handling serialization, transport, and response deserialization. Key aspects covered include defining the interface, invoking functions from the client, argument checking, and verifying functions exist in the interface.
(Rx).NET' way of async programming (.NET summit 2017 Belarus)Stas Rivkin
The document discusses Rx.NET's approach to asynchronous programming using observables and operators. It begins with an introduction to Rx and observables, explaining how they allow pushing data rather than pulling it. It then demonstrates building observables from scratch by implementing the observer pattern directly. Finally, it shows how common Rx operators like Where and Select can be implemented to transform and filter observable sequences. The overall summary is that the document introduces the key concepts of Rx.NET through examples of building observables and operators from first principles in a push-based reactive style.
1. The document contains details of Pranav Ghildiyal, a class XII student. It includes a table of contents listing 24 programs with page numbers.
2. The programs cover concepts like arrays, structures, classes, inheritance, file handling, stacks, queues and more. Algorithms covered include sorting, searching and linked lists.
3. The document serves as an index for various C++ programs written by the student to demonstrate different concepts and data structures.
The document contains multiple C++ code examples for programming exercises. It includes code to generate and output matrices, sort vectors, loop through ranges printing values, and calculate averages of two digit numbers. Jefferson Caiza is listed as the student name for the programming course. The code examples demonstrate basic programming concepts like loops, arrays, conditionals, and math operations.
Twisted is an event-driven networking engine written in Python. It provides tools for developing asynchronous network applications and services. Some key features of Twisted include an asynchronous reactor framework, support for deferreds/promises, common network protocols and services implemented, and application framework for building services.
The document discusses C++ concepts like static data members, static member functions, static objects, constant data members, and constant member functions through examples. It includes code snippets demonstrating how to declare and use static data members and static member functions. It also shows examples of constant data members, constant member functions, and constant objects in C++.
The document contains 5 questions related to C++ programs for matrix and array operations:
1) Finding the average of numbers in an array
2) Finding the smallest number in a 1D array
3) Adding two matrices
4) Finding the transpose of a matrix
5) Multiplying two matrices (for 2x2 matrices and matrices up to 10x10)
Each question provides the full C++ code to implement the operation and sample input/output.
The document discusses pointers in C++. It defines a pointer as a special variable that stores the address of another variable of the same data type. It provides examples of declaring and accessing pointers, pointer arithmetic, pointers as function parameters and return types, pointers and arrays, pointers and strings, and pointers and structures. Key topics covered include pointer declaration and dereferencing operators, pointer arithmetic, self-referential structures, and using pointers to implement linked lists.
Write a Java program in which a method named digitSum that accepts a.pdfnaveenkumar29100
Winnebagel Corp. currently sells 20,000 motor homes per year at $58,000 each, and 7,000
luxury motor coaches per year at $95,000 each. The company wants to introduce a new portable
camper to fill out its product line; it hopes to sell 15,000 of these campers per year at $9,000
each. An independent consultant has determined that if Winnebagel introduces the new campers,
it should boost the sales of its existing motor homes by 2,300 units per year, and reduce the sales
of its motor coaches by 1,000 units per year. What is the amount to use as the annual sales figure
when evaluating this project? (Enter your answer in dollars, not millions of dollars, e.g.
1,234,567.)
Solution
Sales revenue from new portable camper = 15000*$9000 = $ 13,50,00,000 Additional sales
of motor homes = 2300*$58000 = $ 13,34,00,000 Decrease in sales of motor coaches =
1000*$95000 = $ -9,50,00,000 Annual sales figure for evaluating the project $
17,34,00,000.
Самые вкусные баги из игрового кода: как ошибаются наши коллеги-программисты ...DevGAMM Conference
Один из лучших способов снизить количество багов в играх – это показывать программистам, как не стоит писать код. В своём докладе я соберу самые вкусные и необычные ошибки, которые удалось найти в C++ и C# коде таких игр, как VVVVVV, Space Engineers, Command & Conquer, osu! и даже Doom. Я уверен, что каждый из слушателей обязательно узнает для себя что-то новое. В конце концов, это просто приятно – лично увидеть ошибки из кода знакомой и любимой игры!
Adodb Scripts And Some Sample Scripts[1]testduser1
The document contains code snippets demonstrating various ways to interact with databases and files in Visual Basic Script (VBS). This includes examples of connecting to databases, inserting and retrieving data, importing/exporting data from Excel files, reading/writing to text files, and running SQL commands. The last example shows how to parameterize login tests by reading username and password data from an Excel file.
The document contains code snippets demonstrating various ways to interact with databases and files in Visual Basic Script (VBS). This includes examples of connecting to databases, inserting and retrieving data, importing/exporting data from Excel files, reading/writing to text files, and running SQL commands. The last example shows how to parameterize login tests by reading username and password data from an Excel file.
The document discusses various testing techniques including parameterized tests. It provides an example of using parameterized tests with JUnit 4.8.1 to test a tax calculator with sample income and expected tax data. The test class is annotated with @RunWith(Parameterized.class) and has fields for the income and expected tax. It constructs test instances with the data and includes a test that verifies the calculated tax matches the expected value.
This document discusses improving the Java type system by adding behavioral assertions. It describes how assertions can be added for fields, methods, constructors, and on method entry/exit. Fields are handled by injecting code to track writes. Method assertions are added by wrapping the original method. Constructor assertions are added by inserting code before the body. Entry/exit assertions require injecting code at both the start and end of the method. The approach aims to not break original program functionality while checking assertions. Examples are provided for each case.
When it comes to writing tests we often live in the here-and-now and consequently end up producing "write-only" tests. This session looks at what we need to consider if we want to create tests that our future selves and teammates will find valuable instead of becoming another burden on top of delivering the feature itself.
If there is one place that we find it easy to take shortcuts it's when writing tests. Whether we're under the cosh or have an overly-optimistic view of our ability to write self-documenting code, instead of creating tests that support the production code and development process we can find ourselves producing WTFs (Weak Test Functions). The net effect is often a viscous cycle that disparages, instead of encourages us.
In the past I've tried many different ways to try and short-circuit the test writing process, but have only come-up short every time. This session takes a look at why skimping on elements of the test structure, such as organisation, naming and scope only leads to pain and hardship in the long run. Along the way we'll uncover the truth behind common folklore, such as only having one assertion per test.
C++ code only(Retrieve of Malik D., 2015, p. 742) Programming Exer.pdfandreaplotner1
The document describes classes for integer manipulation and prime factorization. It defines member functions to perform operations on integers such as counting digits, reversing digits, splitting integers into blocks, determining primality, and finding prime factorization. It also provides code for driver programs that test the classes and allow the user to select operations via a menu. The full solution includes implementing the remaining member functions, adding constructors/destructors, overloading operators, and separating class specifications from implementation code.
This document describes using rule-based programming and games to teach rule-based programming concepts. It provides examples of rule-based systems for modeling cash flow accounting, a fire suppression system, and a number guessing game. It also includes code snippets defining classes and rules for a text-based adventure game.
Automatically Repairing Test Cases for Evolving Method DeclarationsICSM 2010
TestCareAssistant is a tool that can automatically repair unit tests that fail to compile due to changes in method declarations. It repairs compilation errors by making changes like modifying parameter types, adding or removing parameters, or changing return types. The tool was able to automatically repair 72% of tests cases, 75% of compilation errors, and initialize parameter values correctly in 80% of cases across several open source projects. However, static data flow analysis is not always effective for repairing tests that use complex data structures.
Best Bugs from Games: Fellow Programmers' MistakesAndrey Karpov
George Gribkov will present on errors found in the code of popular games like System Shock, Doom 3, and osu!. He will discuss how his tool searches for code errors, provide examples of bugs detected, and conclude his presentation. The examples will showcase issues like unused variables, incorrect increment variables in for loops, null pointer dereferences, and misunderstandings of operators like ??. Corrections will be proposed to address the bugs.
PVS-Studio analyzer is continuously improving, and the C#-code analysis module is developing most actively: ninety new diagnostic rules were added in 2016. However, the best way to estimate the analyzer's efficiency is to look at the bugs it can catch. It's always interesting, as well as useful, to do recurring checks of large open-source projects at certain intervals and compare their results. Today I will talk about the results of the second analysis of SharpDevelop project.
This document discusses various code smells and anti-patterns that can occur when writing unit tests, such as duplication, overuse of dependencies, lack of cohesion/coupling, fragile tests, and not following good object-oriented design principles. It provides examples of each smell and recommends practices like using fixtures, single responsibility tests, and test data builders to avoid these issues and make tests easier to write and maintain.
This document provides an overview of test-driven development (TDD) and behavior-driven development (BDD), beginning with common misconceptions about TDD and how it differs from traditional testing approaches. It discusses how TDD is a design activity that focuses on emergent design and driving design with tests. Key principles of TDD/BDD are explained, such as writing tests before code, the red-green-refactor cycle, and outside-in development. The document also covers test automation, mock objects, different testing tools and frameworks, and best practices for TDD/BDD.
TDD is the way. This presentation explains how TDD yields better Interfaces, Loose Coupling, Modularity, Separation of Concerns, Testability, and Atomic Commits. TDD exists so we have an easy time coming up with high quality code and so we can refactor easily. 💪
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4. A testing framework
Tests are written in
100% compatible with Java code
Runs on
http://spockframework.org/
5. A basic JUnit test
@Test
public void thatAddAPositiveNumberToZeroReturnsTheSamePositiveNumber()
throws Exception {
int positiveNumber = 23;
int zero = 0;
int result = zero + positiveNumber;
assertEquals(positiveNumber, result);
}
6. A basic Spock test
def "Add a positive number to zero returns the same positive number"() {
given:
def positiveNumber = 23
def zero = 0
when:
def result = zero + positiveNumber
then:
result == positiveNumber
}
7. A basic Spock test
def "Add a positive number to zero returns the same positive number"() {
given:
def positiveNumber = 23
def zero = 0
when:
def result = zero + positiveNumber
then:
result == positiveNumber
}
8. A basic Spock test
DSL
def "Add a positive number to zero returns the same positive number"() {
given:
def positiveNumber = 23
def zero = 0
when:
def result = zero + positiveNumber
then:
result == positiveNumber
}
9. String literals
def "Add a positive number to zero returns the same positive number"() {
(...)
}
@Test
public void thatAddAPositiveNumberToZeroReturnsTheSamePositiveNumber()
throws Exception {
(...)
}
10. String literals
def "Add a positive number to zero returns the same positive number"() {
(...)
}
@Test
public void thatAddAPositiveNumberToZeroReturnsTheSamePositiveNumber()
throws Exception {
(...)
}
def "En un lugar de la Mancha, de cuyo nombre no quiero acordarme,
no ha mucho tiempo que vivía un hidalgo de los de lanza en astillero,
adarga antigua, rocín flaco y galgo corredor. "() {
(...)
}
11. Spock Blocks
given:
def positiveNumber = 23
def zero = 0
when:
def result = zero + positiveNumber
then:
result == positiveNumber
int positiveNumber = 23;
int zero = 0;
int result = zero + positiveNumber;
assertEquals(positiveNumber, result);
Programming vs. Specification
12. Spock Blocks
given:
def positiveNumber = 23
def zero = 0
when:
def result = zero + positiveNumber
then:
result == positiveNumber
// Given
int positiveNumber = 23;
int zero = 0;
// When
int result = zero + positiveNumber;
// Then
assertEquals(positiveNumber, result);
Compilation check
Programming vs. Specification
13. Documented Spock Blocks
given: "A positive number"
def positiveNumber = 23
and: "Well... a SPECTACULAR zero"
def zero = 0
when: "The number is added to zero"
def result = zero + positiveNumber
then: "The result is the same number"
result == positiveNumber
int positiveNumber = 23;
int zero = 0;
int result = zero + positiveNumber;
assertEquals(positiveNumber, result);
Documents purpose
Helps thinking
14. expect block
given: "A positive number"
def positiveNumber = 23
expect: "That added to zero results the same number"
zero + positiveNumber == positiveNumber
Replaces when-then for simple
functional tests
15. Expectations (then / expect)
given:
def positiveNumber = 23
def zero = 0
when:
def result = zero + positiveNumber
then:
result == positiveNumber
int positiveNumber = 23;
int zero = 0;
int result = zero + positiveNumber;
assertEquals(positiveNumber, result);
27. Responses declaration
@Test
public void testSuccessfulPaymentWithNewCreditCard() throws Exception {
when(customerRegistry.getCustomerData(SUBSCRIPTION_ID)).thenReturn(CUSTOMER_DATA);
(...)
PaymentResult result = paymentCoordinator.doPayment(paymentData);
(...)
}
def "Succesful payment with new credit card"() {
given: "A registered customer"
customerRegistry.getCustomerData(SUBSCRIPTION_ID) >> CUSTOMER_DATA
(...)
when: "A payment is requested"
def result = paymentCoordinator.doPayment(paymentData)
(...)
}
28. Interaction expectations
@Test
public void testSuccessfulPaymentWithNewCreditCard() throws Exception {
(...)
when(paymentInteractor.performPaymentInProvider(inputFields))
.thenReturn(PAYMENT_SUCCESSFUL_OUTPUT);
PaymentResult result = paymentCoordinator.doPayment(paymentData);
verify(paymentInteractor).performPaymentInProvider(inputFields)).
(...)
}
def "Succesful payment with new credit card"() {
(...)
when: "A payment is requested"
def result = paymentCoordinator.doPayment(paymentData)
then: "It is sent to the payment provider with successful result"
1 * paymentInteractor.performPaymentInProvider(inputFields) >>
PAYMENT_SUCCESSFUL_OUTPUT
(...)
}
29. Mocks and Stubs
then:
0 * _
Semantic
Lenient: default
values
Only return values
Stubs: empty objects
Stubs: no interaction
expectations
Mocks: nulls
50. ●
Increase abstraction level
Not “programming tests” ® specify test cases
Easy + powerful
Expressivity ® test is also documentation
● Easy to run in continuous integration systems / IDEs
● Better error detection info
Advantages?
51. ● Code Refactors not so safe
● Mocks can only be created in the Spec class
Integration tests with dependency injection overrides ... more
difficult, but possible!
Disadvantages?
52. ● Code Refactors not so safe
● Mocks can only be created in the Spec class
Integration tests with dependency injection overrides ... more
difficult, but possible!
Disadvantages?
class BaseIntegrationSpecification extends TIntegrationSpecification {
@InjectOverride MercadopagoClient mercadopago = Mock()
@Inject PaymentNotificationsService paymentNotificationsServiceMock
(...)
@TIntegrationTestsModule
static class MockedBoundariesModule extends SpockMocksModule {
(...)
}
}
53. ● Code Refactors not so safe
● Mocks can only be created in the Spec class
Integration tests with dependency injection overrides ... more
difficult, but possible!
Disadvantages?
class BaseIntegrationSpecification extends TIntegrationSpecification {
@InjectOverride MercadopagoClient mercadopago = Mock()
@Inject PaymentNotificationsService paymentNotificationsServiceMock
(...)
@TIntegrationTestsModule
static class MockedBoundariesModule extends SpockMocksModule {
(...)
}
}
Buenas a todos, gracias por venir.
Java Testing ==&gt; cuánta gente realmente prueba?
- opensource, std. Groovy
Fácil pensar – no te da tanto, ¿por qué cambiar?
Ejemplo parecido – salto de altura
Dick Fosbury – Mexico 68
Hasta años después no se popularizó del todo – quizá lo que pensaban entonces el resto de saltadores es que no te da tanto, que por qué cambiar, que ellos llevaban toooda la vida … saltando así.