diff --git a/tests/phpunit/tests/http/base.php b/tests/phpunit/tests/http/base.php
index 8a6ce3b3b001a..2e73b0de94431 100644
--- a/tests/phpunit/tests/http/base.php
+++ b/tests/phpunit/tests/http/base.php
@@ -219,6 +219,7 @@ public function test_no_redirection_on_PUT() {
 		);
 
 		$this->skipTestOnTimeout( $res );
+		$this->assertNotWPError( $res );
 		$this->assertSame( 'PASS', wp_remote_retrieve_body( $res ) );
 		$this->assertNotEmpty( $res['headers']['location'] );
 	}
@@ -356,6 +357,7 @@ public function test_post_redirect_to_method_300( $response_code, $method ) {
 		$res = wp_remote_post( add_query_arg( 'response_code', $response_code, $url ), array( 'timeout' => 30 ) );
 
 		$this->skipTestOnTimeout( $res );
+		$this->assertNotWPError( $res );
 		$this->assertSame( $method, wp_remote_retrieve_body( $res ) );
 	}
 
@@ -406,6 +408,7 @@ public function test_ip_url_with_host_header() {
 		$res = wp_remote_get( $url, $args );
 
 		$this->skipTestOnTimeout( $res );
+		$this->assertNotWPError( $res );
 		$this->assertSame( 'PASS', wp_remote_retrieve_body( $res ) );
 	}
 
@@ -447,6 +450,7 @@ public function test_cookie_handling() {
 		$res = wp_remote_get( $url );
 
 		$this->skipTestOnTimeout( $res );
+		$this->assertNotWPError( $res );
 		$this->assertSame( 'PASS', wp_remote_retrieve_body( $res ) );
 	}
 
diff --git a/tests/phpunit/tests/http/functions.php b/tests/phpunit/tests/http/functions.php
index 1da190997db06..9c3e54a8b8911 100644
--- a/tests/phpunit/tests/http/functions.php
+++ b/tests/phpunit/tests/http/functions.php
@@ -15,14 +15,14 @@ public function test_head_request() {
 		$response = wp_remote_head( $url );
 
 		$this->skipTestOnTimeout( $response );
+		$this->assertNotWPError( $response );
 
 		$headers = wp_remote_retrieve_headers( $response );
 
 		$this->assertIsArray( $response );
-
+		$this->assertSame( 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 ) );
 	}
 
 	/**
@@ -34,6 +34,7 @@ public function test_head_redirect() {
 		$response = wp_remote_head( $url );
 
 		$this->skipTestOnTimeout( $response );
+		$this->assertNotWPError( $response );
 		$this->assertSame( 301, wp_remote_retrieve_response_code( $response ) );
 	}
 
@@ -45,6 +46,7 @@ public function test_head_404() {
 		$response = wp_remote_head( $url );
 
 		$this->skipTestOnTimeout( $response );
+		$this->assertNotWPError( $response );
 		$this->assertSame( 404, wp_remote_retrieve_response_code( $response ) );
 	}
 
@@ -59,15 +61,14 @@ public function test_get_request() {
 		$response = wp_remote_get( $url );
 
 		$this->skipTestOnTimeout( $response );
+		$this->assertNotWPError( $response );
 
 		$headers = wp_remote_retrieve_headers( $response );
 
-		$this->assertIsArray( $response );
-
 		// Should return the same headers as a HEAD request.
+		$this->assertSame( 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 ) );
 	}
 
 	/**
@@ -82,13 +83,14 @@ public function test_get_redirect() {
 		$response = wp_remote_get( $url );
 
 		$this->skipTestOnTimeout( $response );
+		$this->assertNotWPError( $response );
 
 		$headers = wp_remote_retrieve_headers( $response );
 
 		// Should return the same headers as a HEAD request.
+		$this->assertSame( 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 ) );
 	}
 
 	/**
@@ -119,6 +121,7 @@ public function test_get_response_cookies() {
 		$response = wp_remote_head( $url );
 
 		$this->skipTestOnTimeout( $response );
+		$this->assertNotWPError( $response );
 
 		$cookies = wp_remote_retrieve_cookies( $response );
 
@@ -164,6 +167,7 @@ public function test_get_response_cookies_with_wp_http_cookie_object() {
 		);
 
 		$this->skipTestOnTimeout( $response );
+		$this->assertNotWPError( $response );
 
 		$cookies = wp_remote_retrieve_cookies( $response );
 
@@ -195,6 +199,7 @@ public function test_get_response_cookies_with_name_value_array() {
 		);
 
 		$this->skipTestOnTimeout( $response );
+		$this->assertNotWPError( $response );
 
 		$cookies = wp_remote_retrieve_cookies( $response );
 
diff --git a/tests/phpunit/tests/readme.php b/tests/phpunit/tests/readme.php
index 7ec762b665345..04faecbb368bf 100644
--- a/tests/phpunit/tests/readme.php
+++ b/tests/phpunit/tests/readme.php
@@ -94,6 +94,7 @@ public function get_response_body( $url ) {
 		$response = wp_remote_get( $url );
 
 		$this->skipTestOnTimeout( $response );
+		$this->assertNotWPError( $response );
 
 		$response_code = wp_remote_retrieve_response_code( $response );
 		$response_body = wp_remote_retrieve_body( $response );