Add basic concept for scm protocol

scm-core/src/test/java/sonia/scm/repository/api/RepositoryServiceTest.java

@@ -0,0 +1,65 @@
+package sonia.scm.repository.api;
+
+import org.junit.Test;
+import sonia.scm.repository.Repository;
+import sonia.scm.repository.spi.HttpScmProtocol;
+import sonia.scm.repository.spi.RepositoryServiceProvider;
+
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import java.util.Collections;
+import java.util.Set;
+
+import static org.assertj.core.api.AssertionsForClassTypes.assertThat;
+import static org.assertj.core.util.IterableUtil.sizeOf;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.when;
+
+public class RepositoryServiceTest {
+
+  private final RepositoryServiceProvider provider = mock(RepositoryServiceProvider.class);
+  private final Repository repository = mock(Repository.class);
+
+  @Test
+  public void shouldReturnProtocolsFromProvider() {
+    when(provider.getSupportedProtocols()).thenReturn(Collections.singleton(new DummyHttpProtocol()));
+
+    RepositoryService repositoryService = new RepositoryService(null, provider, repository, null);
+    Set<ScmProtocol> supportedProtocols = repositoryService.getSupportedProtocols();
+
+    assertThat(sizeOf(supportedProtocols)).isEqualTo(1);
+  }
+
+  @Test
+  public void shouldFindProtocolFromProvider() {
+    when(provider.getSupportedProtocols()).thenReturn(Collections.singleton(new DummyHttpProtocol()));
+
+    RepositoryService repositoryService = new RepositoryService(null, provider, repository, null);
+    HttpScmProtocol protocol = repositoryService.getProtocol(HttpScmProtocol.class);
+
+    assertThat(protocol.getUrl()).isEqualTo("dummy");
+  }
+
+  @Test
+  public void shouldFailForUnknownProtocol() {
+    when(provider.getSupportedProtocols()).thenReturn(Collections.emptySet());
+
+    RepositoryService repositoryService = new RepositoryService(null, provider, repository, null);
+
+    assertThrows(IllegalArgumentException.class, () -> {
+      repositoryService.getProtocol(HttpScmProtocol.class);
+    });
+  }
+
+  private static class DummyHttpProtocol implements HttpScmProtocol {
+    @Override
+    public String getUrl() {
+      return "dummy";
+    }
+
+    @Override
+    public void serve(HttpServletRequest request, HttpServletResponse response) {
+    }
+  }
+}