Attach documentation for Spring Data Commons for Spring Data project.

Closes #167

src/test/java/org/springframework/data/release/model/DocumentationMetadataUnitTests.java

@@ -0,0 +1,50 @@
+/*
+ * Copyright 2021 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
+ *
+ *      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.springframework.data.release.model;
+
+import static org.assertj.core.api.Assertions.*;
+
+import org.junit.jupiter.api.Test;
+
+/**
+ * Unit tests for {@link DocumentationMetadata}.
+ *
+ * @author Mark Paluch
+ */
+class DocumentationMetadataUnitTests {
+
+	@Test // gh-167
+	void shouldReportCorrectDocumentationUrls() {
+
+		DocumentationMetadata metadata = DocumentationMetadata.of(Projects.MONGO_DB, ArtifactVersion.of("3.1.0"));
+
+		assertThat(metadata.getApiDocUrl(ReleaseTrains.OCKHAM))
+				.isEqualTo("https://docs.spring.io/spring-data/mongodb/docs/3.1.0/api/");
+		assertThat(metadata.getReferenceDocUrl(ReleaseTrains.OCKHAM))
+				.isEqualTo("https://docs.spring.io/spring-data/mongodb/docs/3.1.0/reference/html/");
+	}
+
+	@Test // gh-167
+	void shouldReportCorrectCommonsDocumentationUrlsForBuildProject() {
+
+		DocumentationMetadata metadata = DocumentationMetadata.of(Projects.BUILD, ArtifactVersion.of("3.1.0"));
+
+		assertThat(metadata.getApiDocUrl(ReleaseTrains.OCKHAM))
+				.isEqualTo("https://docs.spring.io/spring-data/commons/docs/3.1.0/api/");
+		assertThat(metadata.getReferenceDocUrl(ReleaseTrains.OCKHAM))
+				.isEqualTo("https://docs.spring.io/spring-data/commons/docs/3.1.0/reference/html/");
+	}
+}