add tests

tests/Unit/Clover/Handler/HandleTest.php

@@ -0,0 +1,60 @@
+<?php
+
+declare(strict_types=1);
+
+use Dannecron\CoverageMerger\Clover\Dto\ClassDto;
+use Dannecron\CoverageMerger\Clover\Dto\FileDto;
+use Dannecron\CoverageMerger\Clover\Dto\LineDto;
+use Dannecron\CoverageMerger\Clover\Handler;
+use Dannecron\CoverageMerger\Clover\Parser;
+
+\test('merge multiple valid files', function (): void {
+    $fileWithPackage = \file_get_contents(\getExamplePath('file-with-package.xml'));
+    $fileWithoutPackage = \file_get_contents(\getExamplePath('file-without-package.xml'));
+    $fileWithDifferences = \file_get_contents(\getExamplePath('file-with-differences.xml'));
+    $metricsAndClasses = \file_get_contents(\getExamplePath('metrics-and-classes.xml'));
+
+    $handler = new Handler(new Parser());
+
+    $accumulator = $handler->handle(
+        \simplexml_load_string($fileWithPackage),
+        \simplexml_load_string($fileWithoutPackage),
+        \simplexml_load_string($fileWithDifferences),
+        \simplexml_load_string($metricsAndClasses),
+    );
+
+    $files = $accumulator->getFiles();
+    \expect($files)->toHaveCount(3)
+        ->toHaveKey('test.php')
+        ->toHaveKey('other.php')
+        ->toHaveKey('/src/Example/Namespace/Class.php')
+        ->each->toBeInstanceOf(FileDto::class);
+
+    $testFile = $files['test.php'];
+    \expect($testFile->getClasses())->toHaveCount(0);
+    $testFileLines = $testFile->getLines();
+    \expect($testFileLines)->toHaveCount(7)
+        ->toHaveKeys([1, 2, 3, 4, 5, 6, 8])
+        ->each->toBeInstanceOf(LineDto::class)
+        ->toMatchCallback(fn (LineDto $line): bool => match ($line->getNum()) {
+            1 => $line->getCount() === 0,
+            2, 8 => $line->getCount() === 3,
+            3, 5 => $line->getCount() === 4,
+            6 => $line->getCount() === 1,
+            4 => $line->getCount() === 9,
+            default => true,
+        });
+
+    $classFile = $files['/src/Example/Namespace/Class.php'];
+    \expect($classFile->getClasses())->toHaveCount(1)
+        ->each->toBeInstanceOf(ClassDto::class)
+        ->toMatchCallback(function (ClassDto $class): bool {
+            $properties = $class->getProperties();
+
+            return $properties['name'] === 'Example\Namespace\Class'
+                && $properties['namespace'] === 'Example\Namespace';
+        });
+});
+
+// todo merge multiple files with empty report
+// todo merge multiple files with invalid report