PHPUnit9.0 編寫PHPUnit測(cè)試-錯(cuò)誤相關(guān)信息的輸出

當(dāng)有測(cè)試失敗時(shí)，PHPUnit 全力提供盡可能多的有助于找出問(wèn)題所在的上下文信息。

示例 2.15 數(shù)組比較失敗時(shí)生成的錯(cuò)誤輸出

<?php declare(strict_types=1);
use PHPUnit\Framework\TestCase;

final class ArrayDiffTest extends TestCase
{
    public function testEquality(): void
    {
        $this->assertSame(
            [1, 2,  3, 4, 5, 6],
            [1, 2, 33, 4, 5, 6]
        );
    }
}

$ phpunit ArrayDiffTest
PHPUnit latest.0 by Sebastian Bergmann and contributors.

F

Time: 0 seconds, Memory: 5.25Mb

There was 1 failure:

1) ArrayDiffTest::testEquality
Failed asserting that two arrays are identical.
--- Expected
+++ Actual
@@ @@
 Array (
     0 => 1
     1 => 2
-    2 => 3
+    2 => 33
     3 => 4
     4 => 5
     5 => 6
 )

/home/sb/ArrayDiffTest.php:7

FAILURES!
Tests: 1, Assertions: 1, Failures: 1.

在這個(gè)例子中，數(shù)組中只有一個(gè)值不同，但其他值也都同時(shí)顯示出來(lái)，以提供關(guān)于錯(cuò)誤發(fā)生的位置的上下文信息。
當(dāng)生成的輸出很長(zhǎng)而難以閱讀時(shí)，PHPUnit 將對(duì)其進(jìn)行分割，并在每個(gè)差異附近提供少數(shù)幾行上下文信息。
示例 2.16 長(zhǎng)數(shù)組的數(shù)組比較失敗時(shí)的錯(cuò)誤輸出

<?php declare(strict_types=1);
use PHPUnit\Framework\TestCase;

final class LongArrayDiffTest extends TestCase
{
    public function testEquality(): void
    {
        $this->assertSame(
            [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 2,  3, 4, 5, 6],
            [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 33, 4, 5, 6]
        );
    }
}

$ phpunit LongArrayDiffTest
PHPUnit latest.0 by Sebastian Bergmann and contributors.

F

Time: 0 seconds, Memory: 5.25Mb

There was 1 failure:

1) LongArrayDiffTest::testEquality
Failed asserting that two arrays are identical.
--- Expected
+++ Actual
@@ @@
     11 => 0
     12 => 1
     13 => 2
-    14 => 3
+    14 => 33
     15 => 4
     16 => 5
     17 => 6
 )

/home/sb/LongArrayDiffTest.php:7

FAILURES!
Tests: 1, Assertions: 1, Failures: 1.

邊緣情況

當(dāng)比較失敗時(shí)，PHPUnit 為輸入值建立文本表示，然后以此進(jìn)行對(duì)比。這種實(shí)現(xiàn)導(dǎo)致在差異指示中顯示出來(lái)的問(wèn)題可能比實(shí)際上存在的多。
這種情況只出現(xiàn)在對(duì)數(shù)組或者對(duì)象使用 ?assertEquals()? 或其他“弱”比較函數(shù)時(shí)。
示例 2.17 使用弱比較時(shí)在差異生成過(guò)程中的邊緣情況

<?php declare(strict_types=1);
use PHPUnit\Framework\TestCase;

final class ArrayWeakComparisonTest extends TestCase
{
    public function testEquality(): void
    {
        $this->assertEquals(
            [1, 2, 3, 4, 5, 6],
            ['1', 2, 33, 4, 5, 6]
        );
    }
}

$ phpunit ArrayWeakComparisonTest
PHPUnit latest.0 by Sebastian Bergmann and contributors.

F

Time: 0 seconds, Memory: 5.25Mb

There was 1 failure:

1) ArrayWeakComparisonTest::testEquality
Failed asserting that two arrays are equal.
--- Expected
+++ Actual
@@ @@
 Array (
-    0 => 1
+    0 => '1'
     1 => 2
-    2 => 3
+    2 => 33
     3 => 4
     4 => 5
     5 => 6
 )

/home/sb/ArrayWeakComparisonTest.php:7

FAILURES!
Tests: 1, Assertions: 1, Failures: 1.

在這個(gè)例子中，第一個(gè)索引項(xiàng)中的 1 和 '1' 在報(bào)告中被視為不同，雖然 ?assertEquals()? 認(rèn)為這兩個(gè)值是匹配的。