This document provides instructions for installing and using GoogleTest, a C++ testing framework, to write unit tests for a simple math program that calculates the cubic of numbers. It describes downloading and extracting the GoogleTest package, creating test files with test cases that use GoogleTest macros and functions, building and linking the tests, and executing them with a script to validate the math program meets expectations. Example test cases are provided to check the cubic of specific values.

1. SW Test Automation Using GoogleTest
Brief Introduction
Mohammed Ibrahim
ma_ext@gmx.net
April 15, 2018

2. 1. GoogleTest Installation
1 GoogleTest Installation
Download GoogleTest from the following link
http://code.google.com/p/googletest/downloads/list
Extract this package. You can simply start now working with googletest.
2 Running Test
To work with googletest, assume we have a program for calculating cubic of numbers. This
program is saved as simplemath.h
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#include <cmath>
double cubic(double d) {
return pow(d,3);
}
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To make some test for this program, lets create a folder that contains our test iles. For
our demo here this folder is named as cubetest.
In this folder create your testing iles as follows:
• Create a ile called main_all.c this ile is your main testing iles. It should contain the
following:
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#include "gtest/gtest.h"
int main (int argc, char** argv) {
::testing::InitGoogleTest(&argc, argv);
return RUN_ALL_TESTS();
}
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• Create a ile called unittest_simplemath.c. This ile will contain your test cases. For
example it will be like the following:
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#include "gtest/gtest.h"
#include "/path/to/simplemath.h"
TEST(testMath, myCubeTest_ten) {
EXPECT_EQ(1000, cubic(10));
}
TEST(testMath, myCubeTest_three) {
EXPECT_EQ(27, cubic(3));
}
TEST(testMath, NegativeTest) {
EXPECT_NE(240, cubic(2));
}
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In this ile we created 3 test case: irst test case to check if cubic of 10 is 1000, second test
case to check if cubic of 3 is 27, last test case to check negative test that cubic of 2 is not 240.
Now to run your test cases, it is good approach to build a script that will be ready for
running several times. In our demo here I created a script ile that contains the following
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3. 2. Running Test
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export GTEST_DIR=/path/to/gtest-1.7.0
export WORKING_DIR=/path/to/sample_demo/cubetest
cd $WORKING_DIR
g++ -isystem $GTEST_DIR/include -I$GTEST_DIR -pthread -c $GTEST_DIR/src/gtest-
all.cc
ar -rv libgtest.a gtest-all.o
g++ -isystem $GTEST_DIR/include -pthread $WORKING_DIR/unittest_simplemath.c
$WORKING_DIR/main_all.c libgtest.a -o myout
./myout
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These red lines are used in each run to include some header iles from googletest package.
Youcanusethisscriptinanytest, youhavetochangeworkingdirectoryandpathtogoogletest
directory. Alsoyouhavetochange ilesundertestname(main_all.candunittest_simplemath.c).
Running this example should give a result like the following:
for more information about available test functions, you can check at:
http://code.google.com/p/googletest/wiki/Primer
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