PHP code coverage improvement strategies

PHP code coverage improvement strategies include: writing targeted test cases, using stubs and simulated white-box testing, fuzz test data coverage

PHP code coverage improvement Strategy

Code coverage is an important metric for measuring the effectiveness of your test suite. High code coverage indicates that the test cases are practiced against most of the code paths in the application.

Strategies to improve PHP code coverage:

1. Write targeted test cases: By manually checking the code or using coverage Tools, such as PHPUnit's CodeCoverage, identify uncovered code paths. Write specific test cases for these paths.
2. Use stubs and mocks: Stubs can replace dependencies to isolate the code under test, and mocks can verify the interaction of dependencies. This makes it easier to cover complex or inaccessible code paths.
3. White box testing: White box testing involves examining the internal structure of the code. Using the debugger or breakpoints, you can identify sections of code that are not executed and add corresponding test cases.
4. Fuzz testing: Fuzz testing uses random or atypical inputs and can help expose unexpected code paths and improve coverage.
5. Data coverage: Ensure that test cases cover a wide range of input data to cover code paths under different branch conditions.

Practical case:

Consider the following code:

function calculateDiscount($price, $coupon) {
    if ($coupon == "SUMMER20") {
        return $price * 0.2;
    } else if ($coupon == "AUTUMN10") {
        return $price * 0.1;
    }
    else return $price;
}

To improve code coverage, we need to write test cases to cover all conditions Branches:

// 针对 SUMMER20 优惠券的测试用例
function testSummerDiscount() {
    $price = 100;
    $coupon = "SUMMER20";
    $actualDiscount = calculateDiscount($price, $coupon);
    $expectedDiscount = 20;
    assertEquals($expectedDiscount, $actualDiscount);
}

// 针对 AUTUMN10 优惠券的测试用例
function testAutumnDiscount() {
    $price = 100;
    $coupon = "AUTUMN10";
    $actualDiscount = calculateDiscount($price, $coupon);
    $expectedDiscount = 10;
    assertEquals($expectedDiscount, $actualDiscount);
}

// 针对不使用优惠券的测试用例
function testNoDiscount() {
    $price = 100;
    $coupon = null;
    $actualDiscount = calculateDiscount($price, $coupon);
    $expectedDiscount = 100;
    assertEquals($expectedDiscount, $actualDiscount);
}

You can improve the code coverage of the calculateDiscount() function by writing test cases for all conditional branches.

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