Index: taxonomy/isTaxonomyViewable.php
===================================================================
--- taxonomy/isTaxonomyViewable.php	(nonexistent)
+++ taxonomy/isTaxonomyViewable.php	(working copy)
@@ -0,0 +1,44 @@
+<?php
+
+/**
+ * @group taxonomy
+ */
+class Tests_Taxonomy_IsTaxonomyViewable extends WP_UnitTestCase {
+
+	public function setUp() {
+		register_post_type( 'wptests_pt' );
+		register_taxonomy( 'wptests_tax_viewable', 'wptests_pt', array( 'publicly_queryable' => true ) );
+		register_taxonomy( 'wptests_tax_non_viewable', 'wptests_pt', array( 'publicly_queryable' => false ) );
+	}
+
+	/**
+	 * @ticket 44466
+	 */
+	public function test_is_taxonomy_viewable_for_querable_taxonomy() {
+		$this->assertTrue( is_taxonomy_viewable( 'wptests_tax_viewable' ) );
+	}
+
+	/**
+	 * @ticket 44466
+	 */
+	public function test_is_taxonomy_viewable_for_non_querable_taxonomy() {
+		$this->assertFalse( is_taxonomy_viewable( 'wptests_tax_non_viewable' ) );
+	}
+
+	/**
+	 * @ticket 44466
+	 */
+	public function test_is_taxonomy_viewable_for_non_existing_taxonomy() {
+		$this->assertFalse( is_taxonomy_viewable( 'wptests_tax_non_existing' ) );
+	}
+
+	/**
+	 * @ticket 44466
+	 */
+	public function test_is_taxonomy_viewable_with_object_given() {
+		$taxonomy = get_taxonomy( 'wptests_tax_viewable' );
+
+		$this->assertTrue( is_taxonomy_viewable( $taxonomy ) );
+	}
+
+}