diff --git a/tests/phpunit/tests/media/sideload.php b/tests/phpunit/tests/media/sideload.php
deleted file mode 100644
index 085e5b0422..0000000000
--- a/tests/phpunit/tests/media/sideload.php
+++ /dev/null
@@ -1,106 +0,0 @@
-<?php
-
-/**
- * @group media
- * @group sideload
- */
-class Tests_Media_Sideload extends WP_UnitTestCase {
-	private $attachment_id = 0;
-
-	public function setUp() {
-		parent::setUp();
-
-		add_filter( 'pre_http_request', array( $this, 'mock_sideload_request' ), 10, 3 );
-		add_filter( 'wp_update_attachment_metadata', array( $this, 'get_attachment_metadata' ), 10, 2 );
-	}
-
-	public function tearDown() {
-		parent::tearDown();
-
-		remove_filter( 'pre_http_request', array( $this, 'mock_sideload_request' ), 10, 3 );
-		remove_filter( 'wp_update_attachment_metadata', array( $this, 'get_attachment_metadata' ), 10, 2 );
-	}
-
-	/**
-	 * Catch the attachment ID as attachment meta is updated so that it
-	 * can be used to check against `media_sideload_image` output.
-	 *
-	 * @param array $data Attachment metadata.
-	 * @param int   $id   Attachment ID.
-	 * @return array Attachment metadata.
-	 */
-	public function get_attachment_metadata( $data, $id ) {
-		$this->attachment_id = $id;
-		return $data;
-	}
-
-	/**
-	 * Intercept image sideload requests and mock responses.
-	 *
-	 * @param mixed  $preempt Whether to preempt an HTTP request's return value. Default false.
-	 * @param mixed  $r       HTTP request arguments.
-	 * @param string $url     The request URL.
-	 * @return array Response data.
-	 */
-	public function mock_sideload_request( $preempt, $r, $url ) {
-		// If `$url` is set to false, continue the request to
-		// simulate failure using an improper URL.
-		if ( false == $url ) {
-			return $preempt;
-		}
-
-		// Copy the existing file to the expected temporary location to
-		// simulate a successful upload.
-		copy( DIR_TESTDATA . '/images/test-image.jpg', $r['filename'] );
-		return array(
-			'response' => array(
-				'code' => 200,
-			),
-		);
-	}
-
-	/**
-	 * Tests basic functionality and error handling of `media_sideload_image()`.
-	 *
-	 * @ticket 19629
-	 */
-	function test_wp_media_sideload_image() {
-		$source = 'https://example.com/test-image.jpg';
-		$alt = 'alt text';
-
-		// Test default return value, which should return the same as html.
-		$result = media_sideload_image( $source, 0, $alt );
-		$dest = wp_get_attachment_url( $this->attachment_id );
-
-		$expected = "<img src='$dest' alt='$alt' />";
-		$this->assertEquals( $expected, $result );
-		wp_delete_file( get_attached_file( $this->attachment_id ) );
-
-		// Test 'html' return value
-		$result = media_sideload_image( $source, 0, $alt, 'html' );
-		$dest = wp_get_attachment_url( $this->attachment_id );
-
-		$expected = "<img src='$dest' alt='$alt' />";
-		$this->assertEquals( $expected, $result );
-		wp_delete_file( get_attached_file( $this->attachment_id ) );
-
-		// Test 'id' return value
-		$result = media_sideload_image( $source, 0, $alt, 'id' );
-		$this->assertEquals( $this->attachment_id, $result);
-		wp_delete_file( get_attached_file( $this->attachment_id ) );
-
-		// Test 'src' return value
-		$result = media_sideload_image( $source, 0, $alt, 'src' );
-		$expected = wp_get_attachment_url( $this->attachment_id );
-		$this->assertEquals( $expected, $result);
-		wp_delete_file( get_attached_file( $this->attachment_id ) );
-
-		// Test WP_Error on invalid URL.
-		$result = media_sideload_image( false, 0, $alt, 'id' );
-		$this->assertInstanceOf( 'WP_Error', $result);
-
-		// Test WP_Error if file can't be sanitized to image.
-		$result = media_sideload_image( 'invalid-image.html', 0, $alt, 'id' );
-		$this->assertInstanceOf( 'WP_Error', $result);
-	}
-}