Add a fetch test for upload streaming

See whatwg/fetch#88 for context.

fetch/api/basic/request-upload.js

@@ -18,6 +18,17 @@ function testUpload(desc, url, method, body, expectedBody) {
   }, desc);
 }
 
+function testUploadFailure(desc, url, method, body) {
+  const requestInit = {"method": method};
+  promise_test(test => {
+    if (typeof body === "function")
+      body = body();
+    if (body)
+      requestInit["body"] = body;
+    return promise_rejects(new TypeError(), fetch(url, requestInit));
+  }, desc);
+}
+
 var url = RESOURCES_DIR + "echo-content.py"
 
 testUpload("Fetch with PUT with body", url, "PUT", "Request's body", "Request's body");
@@ -31,5 +42,30 @@ testUpload("Fetch with POST with Float32Array body", url, "POST", new Float32Arr
 testUpload("Fetch with POST with Float64Array body", url, "POST", new Float64Array(1), "\0\0\0\0\0\0\0\0");
 testUpload("Fetch with POST with DataView body", url, "POST", new DataView(new ArrayBuffer(8), 0, 4), "\0\0\0\0");
 testUpload("Fetch with POST with Blob body with mime type", url, "POST", new Blob(["Test"], { type: "text/maybe" }), "Test");
+testUpload("Fetch with POST with ReadableStream", url, "POST", new ReadableStream({start: controller => {
+    const encoder = new TextEncoder();
+    controller.enqueue(encoder.encode("Test"));
+    controller.close();
+  }}), "Test");
+testUploadFailure("Fetch with POST with ReadableStream containing String", url, "POST", new ReadableStream({start: controller => {
+    controller.enqueue("Test");
+    controller.close();
+  }}));
+testUploadFailure("Fetch with POST with ReadableStream containing null", url, "POST", new ReadableStream({start: controller => {
+    controller.enqueue(null);
+    controller.close();
+  }}));
+testUploadFailure("Fetch with POST with ReadableStream containing number", url, "POST", new ReadableStream({start: controller => {
+    controller.enqueue(99);
+    controller.close();
+  }}));
+testUploadFailure("Fetch with POST with ReadableStream containing ArrayBuffer", url, "POST", new ReadableStream({start: controller => {
+    controller.enqueue(new ArrayBuffer());
+    controller.close();
+  }}));
+testUploadFailure("Fetch with POST with ReadableStream containing Blob", url, "POST", new ReadableStream({start: controller => {
+    controller.enqueue(new Blob());
+    controller.close();
+  }}));
 
 done();