add tests for date split and merging

src/backend/tests/Unit/Source/Entities/SplittableDateTest.php

+<?php
+
+
+namespace Tests\Unit\Source\Entities;
+
+
+use Carbon\Carbon;
+use PHPUnit\Framework\TestCase;
+use Source\Entities\SplittableDate;
+
+class SplittableDateTest extends TestCase
+{
+    /** @test */
+    public function it_tests_engulfed_ranges(): void
+    {
+        $d1 = new SplittableDate(Carbon::now()->subMinute(), Carbon::now()->addHour());
+        $d2 = new SplittableDate(Carbon::now(), Carbon::now()->addMinute());
+
+        $this->assertTrue($d1->engulfs($d2));
+        $this->assertFalse($d2->engulfs($d1));
+    }
+
+    /** @test */
+    public function it_tests_engulfed_ranges_when_equal(): void
+    {
+        $s = Carbon::now();
+        $e = $s->clone()->addMinute();
+        $d1 = new SplittableDate($s, $e);
+        $d2 = new SplittableDate($s, $e);
+
+        $this->assertTrue($d1->engulfs($d2));
+        $this->assertTrue($d2->engulfs($d1));
+    }
+
+    /** @test */
+    public function it_tests_overlap_detection(): void
+    {
+        $d1 = new SplittableDate(Carbon::now()->addDay(), Carbon::now()->addYear());
+        $d2 = new SplittableDate(Carbon::now(), Carbon::now()->addHour());
+
+        $this->assertTrue($d1->hasNoOverlapWith($d2));
+        $this->assertTrue($d2->hasNoOverlapWith($d1));
+
+        $d1 = new SplittableDate(Carbon::now()->subDay(), Carbon::now()->addYear());
+        $d2 = new SplittableDate(Carbon::now(), Carbon::now()->addHour());
+
+        $this->assertFalse($d1->hasNoOverlapWith($d2));
+        $this->assertFalse($d2->hasNoOverlapWith($d1));
+
+        $d1 = new SplittableDate(Carbon::now(), Carbon::now()->addMinute());
+        $d2 = new SplittableDate(Carbon::now()->subMinute(), Carbon::now());
+
+        $this->assertFalse($d1->hasNoOverlapWith($d2));
+        $this->assertFalse($d2->hasNoOverlapWith($d1));
+    }
+
+    /** @test */
+    public function it_tests_date_set_merging(): void
+    {
+        // |--- d1 ---|
+        //                |---d2-------------|
+        //                      |---d3---|
+        //                      |-----d4---|
+        //                                      |---d5---|
+        //                                        |---d6---|
+        $d1 = new SplittableDate(Carbon::now()->subDay(), Carbon::now()->subHours(20));
+        $d2 = new SplittableDate(Carbon::now(), Carbon::now()->addHour());
+        $sameStart = Carbon::now()->addMinute();
+        $d3 = new SplittableDate($sameStart, Carbon::now()->addMinutes(10));
+        $d4 = new SplittableDate($sameStart, Carbon::now()->addMinutes(20));
+
+        $d5 = new SplittableDate(Carbon::now()->addYear(), Carbon::now()->addYears(3));
+        $d6 = new SplittableDate(Carbon::now()->addYears(2), Carbon::now()->addYears(10));
+
+        // Test null case
+        $this->assertEquals([], SplittableDate::mergeSet([]));
+
+        // Test case with just 1 in it
+        $result = SplittableDate::mergeSet([$d1]);
+        $this->assertCount(1, $result);
+        $this->assertEquals($d1, $result[0]);
+
+        $result = SplittableDate::mergeSet([$d1, $d2, $d3, $d4, $d5, $d6]);
+        $this->assertCount(3, $result);
+
+        $this->assertEquals($d1, $result[0]);
+        $this->assertEquals($d2, $result[1]);
+        $this->assertEquals($d5->getBegin(), $result[2]->getBegin());
+        $this->assertEquals($d6->getEnd(), $result[2]->getEnd());
+    }
+
+    /** @test */
+    public function it_tests_date_block_splitting(): void
+    {
+        $toSplit = new SplittableDate(Carbon::now()->subHour(), Carbon::now()->addHour());
+        $leftNoOverlap = new SplittableDate(Carbon::now()->subWeek(), Carbon::now()->subDay());
+
+        $leftOverlap = new SplittableDate(Carbon::now()->subHours(2), Carbon::now()->subMinutes(50));
+
+
+        $midBlockLarge = new SplittableDate(Carbon::now()->subMinutes(30), Carbon::now()->addMinutes(2));
+        $midBlockSmall = new SplittableDate(Carbon::now()->subMinute(), Carbon::now()->addMinute());
+
+        $rightMid = new SplittableDate(Carbon::now()->addMinutes(30), Carbon::now()->addMinutes(40));
+
+        $rightOverlap = new SplittableDate(Carbon::now()->addMinutes(50), Carbon::now()->addHours(2));
+
+        $rightNoOverlap = new SplittableDate(Carbon::now()->addDay(), Carbon::now()->addWeek());
+
+        $splits = $toSplit->split([
+            $leftNoOverlap, $leftOverlap, $midBlockLarge, $midBlockSmall, $rightMid, $rightOverlap, $rightNoOverlap,
+        ]);
+
+        $this->assertCount(3, $splits);
+
+        $this->assertEquals($leftOverlap->getEnd(), $splits[0]->getBegin());
+        $this->assertEquals($midBlockLarge->getBegin(), $splits[0]->getEnd());
+        $this->assertEquals($midBlockLarge->getEnd(), $splits[1]->getBegin());
+        $this->assertEquals($rightMid->getBegin(), $splits[1]->getEnd());
+        $this->assertEquals($rightMid->getEnd(), $splits[2]->getBegin());
+        $this->assertEquals($rightOverlap->getBegin(), $splits[2]->getEnd());
+    }
+
+    /** @test */
+    public function test_split_with_engulfs(): void
+    {
+        $toSplit = new SplittableDate(Carbon::now()->subMinute(), Carbon::now()->addMinute());
+        $this->assertEquals([], $toSplit->split([$toSplit]));
+    }
+}