test: add test for gh-15147

Author: matrei

grails-test-examples/app1/grails-app/controllers/functionaltests/DataBindingController.groovy

@@ -0,0 +1,33 @@
+/*
+ *  Licensed to the Apache Software Foundation (ASF) under one
+ *  or more contributor license agreements.  See the NOTICE file
+ *  distributed with this work for additional information
+ *  regarding copyright ownership.  The ASF licenses this file
+ *  to you under the Apache License, Version 2.0 (the
+ *  "License"); you may not use this file except in compliance
+ *  with the License.  You may obtain a copy of the License at
+ *
+ *    https://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing,
+ *  software distributed under the License is distributed on an
+ *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ *  KIND, either express or implied.  See the License for the
+ *  specific language governing permissions and limitations
+ *  under the License.
+ */
+
+package functionaltests
+
+import grails.converters.JSON
+
+class DataBindingController {
+
+    def show(String id) {
+        render([success: true] as JSON)
+    }
+
+    def submit(long id, long data) {
+        render([success: true] as JSON)
+    }
+}

grails-test-examples/app1/src/integration-test/groovy/functionaltests/DataBindingSpec.groovy

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+/*
+ *  Licensed to the Apache Software Foundation (ASF) under one
+ *  or more contributor license agreements.  See the NOTICE file
+ *  distributed with this work for additional information
+ *  regarding copyright ownership.  The ASF licenses this file
+ *  to you under the Apache License, Version 2.0 (the
+ *  "License"); you may not use this file except in compliance
+ *  with the License.  You may obtain a copy of the License at
+ *
+ *    https://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing,
+ *  software distributed under the License is distributed on an
+ *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ *  KIND, either express or implied.  See the License for the
+ *  specific language governing permissions and limitations
+ *  under the License.
+ */
+
+package functionaltests
+
+import spock.lang.Issue
+import spock.lang.PendingFeature
+
+import grails.plugin.geb.ContainerGebSpec
+import grails.testing.mixin.integration.Integration
+
+@Integration
+class DataBindingSpec extends ContainerGebSpec {
+
+    @PendingFeature
+    @Issue('https://github.com/apache/grails-core/issues/15147')
+    void 'data binding works'() {
+        when:
+        go('/dataBinding/submit?id=123&data=456')
+
+        then:
+        pageSource.contains('{"success":true}')
+    }
+}