Integration action test (#28561)

Co-authored-by: Ben Schumacher <ben.schumacher@mattermost.com>

server/.golangci.yml

@@ -77,7 +77,6 @@ issues:
         channels/api4/export_test.go|\
         channels/api4/file_test.go|\
         channels/api4/import_test.go|\
-        channels/api4/integration_action_test.go|\
         channels/api4/ip_filtering_test.go|\
         channels/api4/job_test.go|\
         channels/api4/license.go|\

server/channels/api4/integration_action_test.go

@@ -41,7 +41,8 @@ func (th *testHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	assert.NotEmpty(th.t, poir.TriggerId)
 	assert.Equal(th.t, "button", poir.Type)
 	assert.Equal(th.t, "test-value", poir.Context["test-key"])
-	w.Write([]byte("{}"))
+	_, err = w.Write([]byte("{}"))
+	require.NoError(th.t, err)
 	w.WriteHeader(200)
 }