DATAREST-1446 - Polishing.

Test cases.

Original pull request: #366.

spring-data-rest-webmvc/src/main/java/org/springframework/data/rest/webmvc/support/DefaultExcerptProjector.java

@@ -64,6 +64,7 @@ public class DefaultExcerptProjector implements ExcerptProjector {
 	public boolean hasExcerptProjection(Class<?> type) {
 
 		ResourceMetadata metadata = mappings.getMetadataFor(type);
+
 		return metadata == null ? false : metadata.getExcerptProjection().isPresent();
 	}
 }

spring-data-rest-webmvc/src/test/java/org/springframework/data/rest/webmvc/support/DefaultExcerptProjectorUnitTests.java

@@ -0,0 +1,49 @@
+/*
+ * Copyright 2019 the original author or authors.
+ *
+ * Licensed 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 org.springframework.data.rest.webmvc.support;
+
+import static org.assertj.core.api.Assertions.*;
+import static org.mockito.Mockito.*;
+
+import java.util.Optional;
+
+import org.junit.Test;
+import org.springframework.data.projection.ProjectionFactory;
+import org.springframework.data.rest.core.mapping.ResourceMappings;
+import org.springframework.data.rest.core.mapping.ResourceMetadata;
+
+/**
+ * Unit test for {@link DefaultExcerptProjector}.
+ *
+ * @author Oliver Drotbohm
+ */
+public class DefaultExcerptProjectorUnitTests {
+
+	ProjectionFactory factory = mock(ProjectionFactory.class);
+	ResourceMappings mappings = mock(ResourceMappings.class);
+	ResourceMetadata metadata = mock(ResourceMetadata.class);
+
+	@Test // DATAREST-1446
+	public void doesNotHaveExcerptProjectionIfMetadataReturnsNone() {
+
+		when(mappings.getMetadataFor(Object.class)).thenReturn(metadata);
+		when(metadata.getExcerptProjection()).thenReturn(Optional.empty());
+
+		DefaultExcerptProjector projector = new DefaultExcerptProjector(factory, mappings);
+
+		assertThat(projector.hasExcerptProjection(Object.class)).isFalse();
+	}
+}