Use PHP unit tests to verify correctness of array intersection and union calculations

Yes, this article provides guidance on unit testing correctness of array intersection and union calculations using PHPUnit. Specific steps include: Install PHPUnit. Create test class. Use array_intersect to test array intersection. Use array_union to test array unions. Run the test.

Use PHP unit testing to verify the correctness of array intersection and union calculations

In PHP, array intersection and union It is a common operation. In order to ensure the correctness of the code, unit testing is essential. This article will guide you on how to use PHPUnit to test the calculation results of these operations.

Install PHPUnit

First, make sure PHPUnit is installed. You can install it with the following command:

composer global require phpunit/phpunit

Create a test class

Create a test class, for example ArraySetTest.php:

use PHPUnit\Framework\TestCase;

class ArraySetTest extends TestCase
{
    // ...
}

Test array intersection

To test array intersection, use array_intersect function. Here's how to create a test method for it:

public function testArrayIntersect()
{
    $array1 = [1, 2, 3];
    $array2 = [2, 3, 4];

    $intersect = array_intersect($array1, $array2);

    $this->assertEquals([2, 3], $intersect);
}

Testing array union

Next, to test array union, use the array_union function :

public function testArrayUnion()
{
    $array1 = [1, 2, 3];
    $array2 = [2, 3, 4];

    $union = array_union($array1, $array2);

    $this->assertEquals([1, 2, 3, 4], $union);
}

Run the test

Use the following command to run the test:

phpunit ArraySetTest

If the test passes, you will see output similar to this:

PHPUnit 9.5.19 by Sebastian Bergmann and contributors.

..........

Time: 86 ms, Memory: 6.00 MB

OK (2 tests, 8 assertions)

Practical use

In addition to unit testing, these array setting operations are also widely used in actual combat. For example:

• Find the common points between two user-focused movie lists
• Calculate duplicate values ​​of a set of numbers
• Combine data from different sources into one comprehensive Dataset

By using PHPUnit and clear test cases, you can ensure that your array set calculations are always accurate and reliable.

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