playground: fix the test broken by CL 141478

New fields were added to the response struct in CL 141478.
That was not accounted in the TestCommandHandler test.
This CL fixes the test by adding required fields.

Updates golang/go#25454

Change-Id: I374cef6199235d781bd83a60156ca4f0d90898ee
Reviewed-on: https://go-review.googlesource.com/c/144078
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Yury Smolsky <yury@smolsky.by>
Reviewed-by: Katie Hockman <katie@golang.org>
diff --git a/server_test.go b/server_test.go
index 6314193..34c8c26 100644
--- a/server_test.go
+++ b/server_test.go
@@ -192,12 +192,12 @@
 		{"Failed cmdFunc", http.MethodPost, http.StatusInternalServerError, []byte(`{"Body":"fail"}`), nil},
 		{"Standard flow", http.MethodPost, http.StatusOK,
 			[]byte(`{"Body":"ok"}`),
-			[]byte(`{"Errors":"","Events":[{"Message":"ok","Kind":"stdout","Delay":0}]}
+			[]byte(`{"Errors":"","Events":[{"Message":"ok","Kind":"stdout","Delay":0}],"Status":0,"IsTest":false,"TestsFailed":0}
 `),
 		},
 		{"Errors in response", http.MethodPost, http.StatusOK,
 			[]byte(`{"Body":"error"}`),
-			[]byte(`{"Errors":"errors","Events":null}
+			[]byte(`{"Errors":"errors","Events":null,"Status":0,"IsTest":false,"TestsFailed":0}
 `),
 		},
 		{"Out of memory error in response body event message", http.MethodPost, http.StatusInternalServerError,