Initial Release

tests/Clock/FrozenClockTest.php

@@ -0,0 +1,109 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Beste\Clock\Tests;
+
+use Beste\Clock\FrozenClock;
+use DateTimeImmutable;
+use PHPUnit\Framework\TestCase;
+use Psr\Clock\ClockInterface;
+
+/**
+ * @internal
+ * @coversDefaultClass \Beste\Clock\FrozenClock
+ */
+final class FrozenClockTest extends TestCase
+{
+    /**
+     * @test
+     * @covers ::__construct
+     * @covers ::at
+     * @covers ::now
+     */
+    public function itFreezesTime(): void
+    {
+        $now = new DateTimeImmutable('2021-03-21 22:16:00');
+        $clock = FrozenClock::at($now);
+
+        self::assertEquals($now, $clock->now());
+    }
+
+    /**
+     * @test
+     *
+     * @uses \Beste\Clock\FrozenClock::__construct
+     * @uses \Beste\Clock\FrozenClock::fromUTC()
+     *
+     * @covers ::now()
+     */
+    public function itReturnsAnEqualNowButNotTheSame(): void
+    {
+        $clock = FrozenClock::fromUTC();
+
+        $first = $clock->now();
+        $second = $clock->now();
+
+        self::assertEquals($first, $second);
+        self::assertNotSame($first, $second);
+    }
+
+    /**
+     * @test
+     *
+     * @uses \Beste\Clock\FrozenClock::__construct
+     * @uses \Beste\Clock\FrozenClock::now
+     *
+     * @covers ::withNowFrom
+     */
+    public function itFreezesTimeFromAnotherClock(): void
+    {
+        $now = new DateTimeImmutable('now');
+
+        $clock = $this->createMock(ClockInterface::class);
+        $clock
+            ->expects(self::once())
+            ->method('now')
+            ->willReturn($now);
+
+        $frozenClock = FrozenClock::withNowFrom($clock);
+
+        self::assertEquals($now, $frozenClock->now());
+    }
+
+    /**
+     * @test
+     *
+     * @uses \Beste\Clock\FrozenClock::__construct
+     * @uses \Beste\Clock\FrozenClock::now
+     *
+     * @covers ::fromUTC
+     */
+    public function itFreezesTheCurrentUTCTime(): void
+    {
+        $clock = FrozenClock::fromUTC();
+
+        self::assertSame('UTC', $clock->now()->getTimezone()->getName());
+        self::assertEquals($clock->now(), $clock->now());
+    }
+
+    /**
+     * @test
+     *
+     * @uses \Beste\Clock\FrozenClock::__construct
+     * @uses \Beste\Clock\FrozenClock::at
+     * @uses \Beste\Clock\FrozenClock::now
+     *
+     * @covers ::setTo
+     */
+    public function itCanBeSet(): void
+    {
+        $now = new DateTimeImmutable('2021-03-21 18:18:18');
+        $then = new DateTimeImmutable('2021-03-21 19:19:19');
+
+        $clock = FrozenClock::at($now);
+        $clock->setTo($then);
+
+        self::assertEquals($then, $clock->now());
+    }
+}