net/http: wrap client errors followup

Author: yunginnanet

src/net/http/client_test.go

@@ -2127,3 +2127,23 @@ func testProbeZeroLengthBody(t *testing.T, mode testMode) {
 t.Fatalf("server got body %q, want %q", gotBody, content)
 }
 }
+
+
+func TestClientTimeoutReturnsContextDeadlineExceeded(t *testing.T) {
+run(t, testClientTimeoutReturnsContextDeadlineExceeded)
+}
+func testClientTimeoutReturnsContextDeadlineExceeded(t *testing.T, mode testMode) {
+doneCh := make(chan struct{})
+defer close(doneCh)
+cst := newClientServerTest(t, mode, HandlerFunc(func(w ResponseWriter, r *Request) {
+<-doneCh
+w.WriteHeader(200)
+}))
+// check that, upon exceeding Client.Timeout, the returned error is context.DeadlineExceeded.
+cst.c.Timeout = 5 * time.Millisecond
+req, _ := NewRequest("GET", cst.ts.URL, nil)
+_, err := cst.c.Do(req)
+if !errors.Is(err, context.DeadlineExceeded) {
+t.Fatalf("expected context.DeadlineExceeded, got %v", err)
+}
+}