PHPUnit function for PHP functions

In software development, testing is a very important link. In the PHP development process, PHPUnit is one of the most commonly used tools for testing PHP programs. PHPUnit is a unit testing framework based on test-driven development (TDD) and behavior-driven development (BDD). The main function of PHPUnit is to conduct automated testing of PHP code, find errors and problems in the code, and ensure the stability and reliability of the program.

In addition to providing a testing framework, PHPUnit also provides a series of functions for checking and verifying test results. In this article, we will introduce common functions in PHPUnit and explore their use in PHP development.

1. assertEquals()

The assertEquals() function is one of the most commonly used functions in PHPUnit. Its function is to judge and compare whether the two parameters are equal. If the two parameters are not equal, the test fails, otherwise it passes. The specific usage is as follows:

public function testAdd()
{
  $num1 = 2;
  $num2 = 3;
  $this->assertEquals(5, $num1 + $num2);
}

In the above code, we first define two variables $num1 and $num2, and then use the assertEquals() function to compare whether $num1 $num2 and 5 are equal. If they are equal, test Pass; otherwise the test fails.

2. assertTrue() and assertFalse()

The assertTrue() function is used to determine whether a condition is true. If it is true, the test passes, otherwise the test fails. . Contrary to assertTrue(), the assertFalse() function is used to determine whether a condition is false. The specific usage is as follows:

public function testIsOdd()
{
  $num = 3;
  $this->assertTrue($num % 2 != 0);
  $this->assertFalse($num % 2 == 0);
}

In the above code, we first define a variable $num, and then use the assertTrue() function to determine whether $num%2 is not equal to 0. If so, the test passes; otherwise the test Fail. Then we use the assertFalse() function to determine whether $num%2 is equal to 0. If so, the test fails; otherwise, the test passes.

3. assertGreaterThan() and assertLessThan()

assertGreaterThan() function is used to determine whether a value is greater than another value. If so, the test passes, otherwise the test Fail. Contrary to assertGreaterThan(), the assertLessThan() function is used to determine whether one value is smaller than another value. The specific usage is as follows:

public function testCompare()
{
  $num1 = 5;
  $num2 = 3;
  $this->assertGreaterThan($num2, $num1);
  $this->assertLessThan($num1, $num2 + 2);
}

In the above code, we first define two variables $num1 and $num2, and then use the assertGreaterThan() function to determine whether $num1 is greater than $num2. If so, the test passes; Otherwise the test fails. Then we use the assertLessThan() function to determine whether $num1 is less than $num2 2. If so, the test passes; otherwise, the test fails.

4. assertArrayHasKey()

The assertArrayHasKey() function is used to determine whether an array contains a certain key value. If it does, the test passes, otherwise the test fails. The specific usage is as follows:

public function testArray()
{
  $arr = array('name' => 'Tom', 'age' => 18);
  $this->assertArrayHasKey('name', $arr);
  $this->assertArrayNotHasKey('gender', $arr);
}

In the above code, we first define an associative array $arr, and then use the assertArrayHasKey() function to determine whether $arr contains a key with the key value 'name'. If so, then The test passes; otherwise the test fails. Then we use the assertArrayNotHasKey() function to determine whether $arr does not contain a key with the key value 'gender'. If so, the test passes; otherwise, the test fails.

Summary

In PHP development, testing is a very important link. PHPUnit provides a series of functions that can automatically test PHP code to ensure the stability and reliability of the program. In this article, we introduce common functions in PHPUnit and discuss their use in PHP development to help readers better understand and master PHPUnit.

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