Reading Notes of The Art Of Unit Test Ch3
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Unit testing involves writing automated tests to test code. Automated tests are repeatable and help catch bugs before deploying code. The main benefits of unit testing are that it allows developers to test code frequently and in less time, catch bugs before deploying, deploy with confidence, reduce bugs in production, and refactor code with confidence.
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Recommended
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Measures in SQL (SIGMOD 2024, Santiago, Chile)
SQL has attained widespread adoption, but Business Intelligence tools still use their own higher level languages based upon a multidimensional paradigm. Composable calculations are what is missing from SQL, and we propose a new kind of column, called a measure, that attaches a calculation to a table. Like regular tables, tables with measures are composable and closed when used in queries.
SQL-with-measures has the power, conciseness and reusability of multidimensional languages but retains SQL semantics. Measure invocations can be expanded in place to simple, clear SQL.
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A talk at SIGMOD, June 9–15, 2024, Santiago, Chile
Authors: Julian Hyde (Google) and John Fremlin (Google)
https://doi.org/10.1145/3626246.3653374
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- 1. {THE ART OF UNIT TESTING} READING NOTES BY BENJAMIN FAN
- 2. AGENDA • Breaking dependencies • Why use stubs • How to use stubs
- 3. BREAKING DEPENDENCIES • Dependency: • Services/components that you can‘t fully control in the SUT include loggers, file access, network interaction, and DB access.
- 7. WHY USE STUBS • Breaks the incoming dependency.
- 8. WHY USE STUBS • What if you want to test without the internet? • What if you want to test without a GitHub API token?
- 9. HOW TO USE STUBS • There are three ways to adopt stubs in your unit tests. Some of these require more refactoring of your production code.
- 10. THREE APPROACHES TO STUBBING
- 11. SAMPLE CODE • What if you want to test the expiry scenario?
- 14. INJECTION VIA PARTIAL APPLICATION
- 15. MODULAR INJECTION • This is the sample code used here • This code will verify whether today is a weekend
- 23. TAKE AWAY Two types to break the dependencies:mocks and stubs Mocks break outgoing dependencies Stubs break incoming dependencies Avoid using modular injection Object as parameter (aka duck typing) like Golang style Common interface as parameter - same as object as parameter