diff --git a/tests/phpunit/tests/http/functions.php b/tests/phpunit/tests/http/functions.php
index f08e272922017..50dc04d6697ec 100644
--- a/tests/phpunit/tests/http/functions.php
+++ b/tests/phpunit/tests/http/functions.php
@@ -14,9 +14,12 @@ public function setUp() {
 		parent::setUp();
 	}
 
-	function test_head_request() {
-		// this url give a direct 200 response
-		$url      = 'https://asdftestblog1.files.wordpress.com/2007/09/2007-06-30-dsc_4700-1.jpg';
+	/**
+	 * @covers ::wp_remote_head
+	 */
+	public function test_head_request() {
+		// This URL gives a direct 200 response.
+		$url      = 'https://s.w.org/screenshots/3.9/dashboard.png';
 		$response = wp_remote_head( $url );
 
 		$this->skipTestOnTimeout( $response );
@@ -25,30 +28,38 @@ function test_head_request() {
 
 		$this->assertInternalType( 'array', $response );
 
-		$this->assertEquals( 'image/jpeg', $headers['content-type'] );
-		$this->assertEquals( '40148', $headers['content-length'] );
-		$this->assertEquals( '200', wp_remote_retrieve_response_code( $response ) );
+		$this->assertSame( 'image/png', $headers['Content-Type'] );
+		$this->assertSame( '153204', $headers['Content-Length'] );
+		$this->assertSame( 200, wp_remote_retrieve_response_code( $response ) );
 	}
 
 	function test_head_redirect() {
 		// this url will 301 redirect
-		$url      = 'https://asdftestblog1.wordpress.com/files/2007/09/2007-06-30-dsc_4700-1.jpg';
+		$url      = 'https://wp.org/screenshots/3.9/dashboard.png';
 		$response = wp_remote_head( $url );
 
 		$this->skipTestOnTimeout( $response );
 		$this->assertEquals( '301', wp_remote_retrieve_response_code( $response ) );
 	}
 
-	function test_head_404() {
-		$url      = 'https://asdftestblog1.files.wordpress.com/2007/09/awefasdfawef.jpg';
+	/**
+	 * @covers ::wp_remote_head
+	 */
+	public function test_head_404() {
+		$url      = 'https://wordpress.org/screenshots/3.9/awefasdfawef.jpg';
 		$response = wp_remote_head( $url );
 
 		$this->skipTestOnTimeout( $response );
 		$this->assertEquals( '404', wp_remote_retrieve_response_code( $response ) );
 	}
 
-	function test_get_request() {
-		$url = 'https://asdftestblog1.files.wordpress.com/2007/09/2007-06-30-dsc_4700-1.jpg';
+	/**
+	 * @covers ::wp_remote_get
+	 * @covers ::wp_remote_retrieve_headers
+	 * @covers ::wp_remote_retrieve_response_code
+	 */
+	public function test_get_request() {
+		$url = 'https://s.w.org/screenshots/3.9/dashboard.png';
 
 		$response = wp_remote_get( $url );
 
@@ -58,15 +69,20 @@ function test_get_request() {
 
 		$this->assertInternalType( 'array', $response );
 
-		// should return the same headers as a head request
-		$this->assertEquals( 'image/jpeg', $headers['content-type'] );
-		$this->assertEquals( '40148', $headers['content-length'] );
-		$this->assertEquals( '200', wp_remote_retrieve_response_code( $response ) );
+		// Should return the same headers as a HEAD request.
+		$this->assertSame( 'image/png', $headers['Content-Type'] );
+		$this->assertSame( '153204', $headers['Content-Length'] );
+		$this->assertSame( 200, wp_remote_retrieve_response_code( $response ) );
 	}
 
-	function test_get_redirect() {
-		// this will redirect to asdftestblog1.files.wordpress.com
-		$url = 'https://asdftestblog1.wordpress.com/files/2007/09/2007-06-30-dsc_4700-1.jpg';
+	/**
+	 * @covers ::wp_remote_get
+	 * @covers ::wp_remote_retrieve_headers
+	 * @covers ::wp_remote_retrieve_response_code
+	 */
+	public function test_get_redirect() {
+		// This will redirect to wordpress.org.
+		$url = 'https://wp.org/screenshots/3.9/dashboard.png';
 
 		$response = wp_remote_get( $url );
 
@@ -74,15 +90,18 @@ function test_get_redirect() {
 
 		$headers = wp_remote_retrieve_headers( $response );
 
-		// should return the same headers as a head request
-		$this->assertEquals( 'image/jpeg', $headers['content-type'] );
-		$this->assertEquals( '40148', $headers['content-length'] );
-		$this->assertEquals( '200', wp_remote_retrieve_response_code( $response ) );
+		// Should return the same headers as a HEAD request.
+		$this->assertSame( 'image/png', $headers['Content-Type'] );
+		$this->assertSame( '153204', $headers['Content-Length'] );
+		$this->assertSame( 200, wp_remote_retrieve_response_code( $response ) );
 	}
 
-	function test_get_redirect_limit_exceeded() {
-		// this will redirect to asdftestblog1.files.wordpress.com
-		$url = 'https://asdftestblog1.wordpress.com/files/2007/09/2007-06-30-dsc_4700-1.jpg';
+	/**
+	 * @covers ::wp_remote_get
+	 */
+	public function test_get_redirect_limit_exceeded() {
+		// This will redirect to wordpress.org.
+		$url = 'https://wp.org/screenshots/3.9/dashboard.png';
 
 		// pretend we've already redirected 5 times
 		$response = wp_remote_get( $url, array( 'redirection' => -1 ) );
diff --git a/tests/phpunit/tests/image/functions.php b/tests/phpunit/tests/image/functions.php
index d763e4d0e4de5..a46678c3fb710 100644
--- a/tests/phpunit/tests/image/functions.php
+++ b/tests/phpunit/tests/image/functions.php
@@ -335,7 +335,7 @@ public function test_wp_crop_image_url() {
 		}
 
 		$file = wp_crop_image(
-			'https://asdftestblog1.files.wordpress.com/2008/04/canola.jpg',
+			'https://s.w.org/screenshots/3.9/dashboard.png',
 			0,
 			0,
 			100,
@@ -343,7 +343,7 @@ public function test_wp_crop_image_url() {
 			100,
 			100,
 			false,
-			DIR_TESTDATA . '/images/' . __FUNCTION__ . '.jpg'
+			DIR_TESTDATA . '/images/' . __FUNCTION__ . '.png'
 		);
 		$this->assertNotWPError( $file );
 		$this->assertFileExists( $file );
@@ -374,7 +374,7 @@ public function test_wp_crop_image_url_not_exist() {
 		}
 
 		$file = wp_crop_image(
-			'https://asdftestblog1.files.wordpress.com/2008/04/canoladoesnotexist.jpg',
+			'https://wordpress.org/screenshots/3.9/canoladoesnotexist.jpg',
 			0,
 			0,
 			100,