diff --git a/tests/phpunit/tests/functions/wpArraySliceAssoc.php b/tests/phpunit/tests/functions/wpArraySliceAssoc.php
new file mode 100755
index 0000000000..73df5cb87c
--- /dev/null
+++ b/tests/phpunit/tests/functions/wpArraySliceAssoc.php
@@ -0,0 +1,129 @@
+<?php
+
+/**
+ * Tests wp_array_slice_assoc function
+ *
+ * @since 5.3.0
+ *
+ * @covers wp_array_slice_assoc
+ * @group functions.php
+ */
+class Tests_Functions_WpArraySliceAssoc extends WP_UnitTestCase {
+
+	/**
+	 * Test wp_array_slice_assoc().
+	 *
+	 * @dataProvider data_wp_array_slice_assoc_arrays
+	 *
+	 * @ticket 46638
+	 *
+	 * @param array $target_array The original array.
+	 * @param array $keys         The list of keys.
+	 * @param array $expected     The expected result.
+	 */
+	public function test_wp_array_slice_assoc( $target_array, $keys, $expected ) {
+		$this->assertSame( wp_array_slice_assoc( $target_array, $keys ), $expected );
+	}
+
+	/**
+	 * Test data for wp_array_slice_assoc().
+	 *
+	 * @return array
+	 */
+	public function data_wp_array_slice_assoc_arrays() {
+		return array(
+			array(
+				array( 1 => 1 ),
+				array( 1 ),
+				array( 1 => 1 ),
+			),
+			array(
+				array( 1 => 1 ),
+				array( 0 ),
+				array(),
+			),
+			array(
+				array( 1 => array( 1 => 1 ) ),
+				array( 1 ),
+				array( 1 => array( 1 => 1 ) ),
+			),
+			array(
+				array(
+					1 => 1,
+					2 => 2,
+				),
+				array( 1 ),
+				array( 1 => 1 ),
+			),
+			array(
+				array(
+					1 => 1,
+					2 => 2,
+				),
+				array( 2 ),
+				array( 2 => 2 ),
+			),
+			array(
+				array(
+					1 => 1,
+					2 => 2,
+				),
+				array( 1, 1 ),
+				array( 1 => 1 ),
+			),
+			array(
+				array( 1 => array( 1 => array( 1 => 1 ) ) ),
+				array( 1 ),
+				array( 1 => array( 1 => array( 1 => 1 ) ) ),
+			),
+			array(
+				array(
+					1 => 1,
+					2 => 2,
+				),
+				array( 1, 2 ),
+				array(
+					1 => 1,
+					2 => 2,
+				),
+			),
+			array(
+				array(
+					'1' => '1',
+					'2' => '2',
+				),
+				array( '1' ),
+				array( '1' => '1' ),
+			),
+			array(
+				array(
+					'1' => '1',
+					'2' => '2',
+				),
+				array( '2' ),
+				array( '2' => '2' ),
+			),
+			array(
+				array(
+					'1' => '1',
+					'2' => '2',
+				),
+				array( 1 ),
+				array( '1' => '1' ),
+			),
+			array(
+				array(
+					'1' => '1',
+					'2' => '2',
+				),
+				array( 1 ),
+				array( '1' => '1' ),
+			),
+			array(
+				array( 1 => 1 ),
+				array( '1' ),
+				array( 1 => 1 ),
+			),
+		);
+	}
+}