migrate fetch tests to htmlRunner

src/tests/fetch/response.html

@@ -0,0 +1,38 @@
+<script src="../testing.js"></script>
+
+<script id=response>
+  let response = new Response("Hello, World!");
+  testing.expectEqual(200, response.status);
+  testing.expectEqual("", response.statusText);
+  testing.expectEqual(true, response.ok);
+  testing.expectEqual("", response.url);
+  testing.expectEqual(false, response.redirected);
+
+  let response2 = new Response("Error occurred", {
+    status: 404,
+    statusText: "Not Found",
+    headers: { 
+        "Content-Type": "text/plain", 
+        "X-Custom": "test-value",
+        "Cache-Control": "no-cache"
+    }
+  });
+  testing.expectEqual(404, response2.status);
+  testing.expectEqual("Not Found", response2.statusText);
+  testing.expectEqual(false, response2.ok);
+  testing.expectEqual("text/plain", response2.headers.get("Content-Type"));
+  testing.expectEqual("test-value", response2.headers.get("X-Custom"));
+  testing.expectEqual("no-cache", response2.headers.get("cache-control"));
+        
+  let response3 = new Response("Created", { status: 201, statusText: "Created" });
+  testing.expectEqual(201, response3.status);
+  testing.expectEqual("Created", response3.statusText);
+  testing.expectEqual(true, response3.ok);
+
+  let nullResponse = new Response(null);
+  testing.expectEqual(200, nullResponse.status);
+  testing.expectEqual("", nullResponse.statusText);
+
+  let emptyResponse = new Response("");
+  testing.expectEqual(200, emptyResponse.status);
+</script>