Add more tests

Author: JBlond

tests/Diff/DiffTest.php

@@ -0,0 +1,65 @@
+<?php
+
+namespace Tests\Diff;
+
+use jblond\Diff;
+use jblond\Diff\Renderer\Text\Unified;
+use jblond\Diff\Renderer\Html\SideBySide;
+use jblond\Diff\Renderer\Text\Json;
+use PHPUnit\Framework\TestCase;
+
+class DiffTest extends TestCase
+{
+    public function testIdenticalStrings()
+    {
+        $diff = new Diff("Hello", "Hello");
+        $this->assertTrue($diff->isIdentical());
+        $this->assertFalse($diff->render(new Unified()));
+    }
+
+    public function testCompletelyDifferentStrings()
+    {
+        $diff = new Diff("A", "B");
+        $output = $diff->render(new Unified());
+        $this->assertStringContainsString("-A", $output);
+        $this->assertStringContainsString("+B", $output);
+    }
+
+    public function testIgnoreWhitespace()
+    {
+        $options = ['ignoreWhitespace' => true];
+        $diff = new Diff("Hello World", "Hello   World", $options);
+        $this->assertTrue($diff->isIdentical());
+    }
+
+    public function testIgnoreCase()
+    {
+        $options = ['ignoreCase' => true];
+        $diff = new Diff("Hello", "hello", $options);
+        $this->assertTrue($diff->isIdentical());
+    }
+
+    public function testHtmlRendererOutput()
+    {
+        $diff = new Diff("foo", "bar");
+        $output = $diff->render(new SideBySide());
+        $this->assertStringContainsString("<table", $output);
+        $this->assertStringContainsString("</table>", $output);
+    }
+
+    public function testJsonRendererOutput()
+    {
+        $diff = new Diff("foo", "bar");
+        $output = $diff->render(new Json());
+        $decoded = json_decode($output, true);
+
+        $this->assertIsArray($decoded);
+        $this->assertNotEmpty($decoded);
+    }
+
+    public function testEmptyInputs()
+    {
+        $diff = new Diff("", "");
+        $this->assertTrue($diff->isIdentical());
+    }
+}