How to use PHPUnit to debug unit tests of PHP functions?

Use PHPUnit to debug unit tests of PHP functions: Install PHPUnit. Create test cases. Run the test. Use the --debug option to enable the debugger. Use the debugger to find and fix errors.

How to use PHPUnit to debug unit tests of PHP functions

PHPUnit is a popular PHPUnit framework for testing PHP applications . It provides powerful debugging features that can help you easily find and fix problems in unit tests.

Here's how to use PHPUnit to debug unit tests of PHP functions:

1. Install PHPUnit

composer global require phpunit/phpunit

2. Create test cases

namespace MyTestNamespace;

use PHPUnit\Framework\TestCase;

class MyTestCase extends TestCase
{
    public function testMyFunction(): void
    {
        $this->assertEquals(expectedValue, myFunction(inputvalue));
    }
}

3. Run the test

phpunit

4. Use the debugger

Once the test fails, you can Enable the debugger using the --debug option:

phpunit --debug

This will open an interactive debugger after a failed test fails, which you can use to inspect variables, stack traces, and information about the failure Additional information on the cause.

Practical case

Suppose you are testing the myFunction function, which accepts an input value and returns the expected value. However, your test fails.

Debugging steps:

1. Run phpunit --debug
2. In the debugger, use var_dump() Checks the values ​​of inputvalue and expectedValue.
3. Use debug_print_backtrace() to examine the stack trace of a function call.
4. Find and fix errors based on the information displayed in the debugger.

For example, if the value of inputvalue is not what you expected, you need to check the code that calls the myFunction function to make sure it is passing the correct parameters.

Tip:

• Use the var_dump() and debug_print_backtrace() functions to debug variables and stack traces .
• Read the PHPUnit documentation for more debugging tips.
• Use a version control system to track your changes so that you can roll them back if needed.

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