NIFI-49: Included patch from Philip Young to include name of default value when not allowed as a property descriptor value

nifi-api/src/test/java/org/apache/nifi/components/TestPropertyDescriptor.java

@@ -0,0 +1,59 @@
+/*
+ * 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
+ *
+ *     http://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 org.apache.nifi.components;
+
+import static org.junit.Assert.assertNotNull;
+
+import org.apache.nifi.components.PropertyDescriptor.Builder;
+import org.junit.BeforeClass;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.ExpectedException;
+
+
+/**
+ * Regression test for issue NIFI-49, to ensure that if a Processor's Property's Default Value is not allowed, 
+ * the Exception thrown should indicate what the default value is
+ */
+public class TestPropertyDescriptor {
+
+    private static Builder invalidDescriptorBuilder;
+    private static Builder validDescriptorBuilder;
+    private static String DEFAULT_VALUE = "Default Value";
+    
+    @Rule
+    public ExpectedException thrown = ExpectedException.none();
+    
+    @BeforeClass
+    public static void setUp() {
+        validDescriptorBuilder = new PropertyDescriptor.Builder().name("").allowableValues("Allowable Value", "Another Allowable Value").defaultValue("Allowable Value");
+        invalidDescriptorBuilder = new PropertyDescriptor.Builder().name("").allowableValues("Allowable Value", "Another Allowable Value").defaultValue(DEFAULT_VALUE);
+    }
+    
+    @Test
+    public void testExceptionThrownByDescriptorWithInvalidDefaultValue() {
+        thrown.expect(IllegalStateException.class);
+        thrown.expectMessage("["+ DEFAULT_VALUE +"]");
+            
+        invalidDescriptorBuilder.build();
+    }
+    
+    @Test
+    public void testNoExceptionThrownByPropertyDescriptorWithValidDefaultValue() {
+        assertNotNull(validDescriptorBuilder.build());
+    }
+}