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Functional unit testing is an automated testing technique used to test the expected behavior of a C function in isolation. Applicable to the following scenarios: Verify function behavior Check boundary conditions Detect errors Refactor code as documentation
When to use C function unit testing
Function unit testing is an automated testing technology that performs isolated testing of C functions. It helps you ensure that functions work as expected and detect edge cases or errors.
Here are some situations when it is appropriate to use function unit testing:
Practical Case
Let us consider a simple C function that calculates the sum of two numbers:
int add(int a, int b) { return a + b; }
We can use Google Test framework writes a unit test to verify the behavior of this function:
#include <gtest/gtest.h> TEST(AddFunctionTest, PositiveNumbers) { EXPECT_EQ(add(1, 2), 3); EXPECT_EQ(add(4, 5), 9); } TEST(AddFunctionTest, NegativeNumbers) { EXPECT_EQ(add(-1, -2), -3); EXPECT_EQ(add(-3, -4), -7); }
Code description:
TEST()
Macro definition A unit test. EXPECT_EQ()
Asserts that two expressions have equal values. Running these tests will verify the expected behavior of the add()
function under different inputs.
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