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diff --git a/www/wiki/tests/phpunit/includes/libs/HtmlArmorTest.php b/www/wiki/tests/phpunit/includes/libs/HtmlArmorTest.php
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+++ b/www/wiki/tests/phpunit/includes/libs/HtmlArmorTest.php
@@ -0,0 +1,55 @@
+<?php
+
+/**
+ * @covers HtmlArmor
+ */
+class HtmlArmorTest extends PHPUnit\Framework\TestCase {
+
+	use MediaWikiCoversValidator;
+
+	public static function provideConstructor() {
+		return [
+			[ 'test' ],
+			[ null ],
+			[ '<em>some html!</em>' ]
+		];
+	}
+
+	/**
+	 * @dataProvider provideConstructor
+	 */
+	public function testConstructor( $value ) {
+		$this->assertInstanceOf( HtmlArmor::class, new HtmlArmor( $value ) );
+	}
+
+	public static function provideGetHtml() {
+		return [
+			[
+				'foobar',
+				'foobar',
+			],
+			[
+				'<script>alert("evil!");</script>',
+				'&lt;script&gt;alert(&quot;evil!&quot;);&lt;/script&gt;',
+			],
+			[
+				new HtmlArmor( '<script>alert("evil!");</script>' ),
+				'<script>alert("evil!");</script>',
+			],
+			[
+				new HtmlArmor( null ),
+				null,
+			]
+		];
+	}
+
+	/**
+	 * @dataProvider provideGetHtml
+	 */
+	public function testGetHtml( $input, $expected ) {
+		$this->assertEquals(
+			$expected,
+			HtmlArmor::getHtml( $input )
+		);
+	}
+}