diff --git a/test/unit/php/includes/core/classes/class-test-topic.php b/test/unit/php/includes/core/classes/class-test-topic.php
new file mode 100644
index 000000000..df59b779e
--- /dev/null
+++ b/test/unit/php/includes/core/classes/class-test-topic.php
@@ -0,0 +1,105 @@
+<?php
+/**
+ * Class handles unit tests for GatherPress\Core\Topic.
+ *
+ * @package GatherPress\Core
+ * @since 1.0.0
+ */
+
+namespace GatherPress\Tests\Core;
+
+use GatherPress\Core\Topic;
+use PMC\Unit_Test\Base;
+
+/**
+ * Class Test_Topic.
+ *
+ * @coversDefaultClass \GatherPress\Core\Topic
+ */
+class Test_Topic extends Base {
+	/**
+	 * Coverage for __construct and setup_hooks.
+	 *
+	 * @covers ::__construct
+	 * @covers ::setup_hooks
+	 *
+	 * @return void
+	 */
+	public function test_setup_hooks(): void {
+		$instance = Topic::get_instance();
+		$hooks    = array(
+			array(
+				'type'     => 'action',
+				'name'     => 'init',
+				'priority' => 10,
+				'callback' => array( $instance, 'register_taxonomy' ),
+			),
+		);
+
+		$this->assert_hooks( $hooks, $instance );
+	}
+
+	/**
+	 * Coverage for register_taxonomy method.
+	 *
+	 * @covers ::register_taxonomy
+	 *
+	 * @return void
+	 */
+	public function test_register_taxonomy(): void {
+		$instance = Topic::get_instance();
+
+		unregister_taxonomy( Topic::TAXONOMY );
+
+		$this->assertFalse( taxonomy_exists( Topic::TAXONOMY ), 'Failed to assert that taxonomy does not exist.' );
+
+		$instance->register_taxonomy();
+
+		$this->assertTrue( taxonomy_exists( Topic::TAXONOMY ), 'Failed to assert that taxonomy exists.' );
+	}
+
+	/**
+	 * Coverage for get_localized_taxonomy_slug method.
+	 *
+	 * @covers ::get_localized_taxonomy_slug
+	 *
+	 * @return void
+	 */
+	public function test_get_localized_taxonomy_slug(): void {
+		$instance = Topic::get_instance();
+
+		$this->assertSame(
+			'topic',
+			$instance->get_localized_taxonomy_slug(),
+			'Failed to assert english taxonomy slug is "topic".'
+		);
+
+		$filter = static function ( string $translation, string $text, string $context ): string {
+			if ( 'topic' !== $text || 'Taxonomy Slug' !== $context ) {
+				return $translation;
+			}
+			return 'Ünit Tést';
+		};
+
+		/**
+		 * Instead of loading additional languages into the unit test suite,
+		 * we just filter the translated value, to mock different languages.
+		 *
+		 * Filters text with its translation based on context information for a domain.
+		 *
+		 * @param string $translation Translated text.
+		 * @param string $text        Text to translate.
+		 * @param string $context     Context information for the translators.
+		 * @return string Translated text.
+		 */
+		add_filter( 'gettext_with_context_gatherpress', $filter, 10, 3 );
+
+		$this->assertSame(
+			'unit-test',
+			$instance->get_localized_taxonomy_slug(),
+			'Failed to assert taxonomy slug is "unit-test".'
+		);
+
+		remove_filter( 'gettext_with_context_gatherpress', $filter );
+	}
+}