add BranchLinkProvider which returns internal api link for given branch of repository

scm-webapp/src/test/java/sonia/scm/api/v2/resources/DefaultBranchLinkProviderTest.java

@@ -0,0 +1,63 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2020-present Cloudogu GmbH and Contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+package sonia.scm.api.v2.resources;
+
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.Answers;
+import org.mockito.InjectMocks;
+import org.mockito.Mock;
+import org.mockito.junit.jupiter.MockitoExtension;
+import sonia.scm.repository.Repository;
+import sonia.scm.repository.RepositoryTestData;
+
+import java.net.URI;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+@ExtendWith(MockitoExtension.class)
+class DefaultBranchLinkProviderTest {
+
+  @Mock(answer = Answers.RETURNS_DEEP_STUBS)
+  private ResourceLinks resourceLinks;
+
+  @InjectMocks
+  private DefaultBranchLinkProvider branchLinkProvider;
+
+  @Test
+  void shouldReturnBranchLink() {
+    when(resourceLinks.branch()).thenReturn(new ResourceLinks.BranchLinks(() -> URI.create("/")));
+    Repository repository = RepositoryTestData.createHeartOfGold();
+    String branch = "develop";
+
+    String branchLink = branchLinkProvider.get(repository.getNamespaceAndName(), branch);
+
+    assertThat(branchLink).isEqualTo("/v2/repositories/hitchhiker/HeartOfGold/branches/develop");
+  }
+
+}