Add more tests

Author: JBlond

tests/Diff/Renderer/JSon/JsonTest.php

@@ -0,0 +1,23 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tests\Diff\Renderer\Text;
+
+use PHPUnit\Framework\TestCase;
+use jblond\Diff;
+use jblond\Diff\Renderer\Text\Json;
+
+class JsonTest extends TestCase
+{
+    public function testJsonRendererProducesValidJson()
+    {
+        $diff = new Diff("foo", "bar");
+        $output = $diff->render(new Json());
+        $decoded = json_decode($output, true);
+
+        $this->assertIsArray($decoded);
+        $this->assertNotEmpty($decoded);
+        $this->assertIsArray($decoded[0]);
+    }
+}

tests/Diff/Renderer/Text/UnifiedTest.php

@@ -0,0 +1,20 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tests\Diff\Renderer\Text;
+
+use jblond\Diff;
+use jblond\Diff\Renderer\Text\Unified;
+use PHPUnit\Framework\TestCase;
+
+class UnifiedTest extends TestCase
+{
+    public function testUnifiedRendererShowsChanges()
+    {
+        $diff = new Diff("foo", "bar");
+        $output = $diff->render(new Unified());
+        $this->assertStringContainsString("-foo", $output);
+        $this->assertStringContainsString("+bar", $output);
+    }
+}