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| ****************************************************************/ |
| |
| package org.apache.james.jmap.draft.utils; |
| |
| import static org.assertj.core.api.Assertions.assertThat; |
| |
| import java.util.List; |
| import java.util.Optional; |
| import java.util.stream.Collectors; |
| import java.util.stream.Stream; |
| |
| import org.apache.james.jmap.draft.utils.DependencyGraph.CycleDetectedException; |
| import org.junit.Test; |
| |
| import com.google.common.annotations.VisibleForTesting; |
| import com.google.common.base.Preconditions; |
| import com.google.common.collect.ImmutableList; |
| |
| public class DependencyGraphTest { |
| |
| @Test |
| public void getBuildChainShouldReturnOrderedMailbox() { |
| // Given |
| Commit a = new Commit("A"); |
| Commit b = new Commit("B", a); |
| Commit c = new Commit("C", b); |
| |
| DependencyGraph<Commit> graph = new DependencyGraph<>(Commit::getParent); |
| Stream.of(b, a, c) |
| .forEach(graph::registerItem); |
| |
| // When |
| Stream<Commit> orderedMailboxes = graph.getBuildChain(); |
| |
| // Then |
| assertThat(orderedMailboxes).extracting(Commit::getMessage).containsExactly("A", "B", "C"); |
| } |
| |
| @Test |
| public void getBuildChainWithEmptyGraphShouldReturnEmpty() { |
| DependencyGraph<Commit> graph = new DependencyGraph<>(m -> null); |
| assertThat(graph.getBuildChain()).isEmpty(); |
| } |
| |
| @Test |
| public void getBuildChainOnIsolatedVerticesShouldReturnSameOrder() { |
| DependencyGraph<Commit> graph = new DependencyGraph<>(m -> Optional.empty()); |
| ImmutableList<Commit> isolatedMailboxes = ImmutableList.of(new Commit("A"), new Commit("B"), new Commit("C")); |
| isolatedMailboxes.forEach(graph::registerItem); |
| |
| List<Commit> orderedResultList = graph.getBuildChain().collect(Collectors.toList()); |
| |
| assertThat(orderedResultList).isEqualTo(isolatedMailboxes); |
| } |
| |
| @Test |
| public void getBuildChainOnTwoIsolatedTreesShouldWork() { |
| // a-b d-e |
| // \c \f |
| |
| //Given |
| Commit a = new Commit("A"); |
| Commit b = new Commit("B", a); |
| Commit c = new Commit("C", b); |
| Commit d = new Commit("D"); |
| Commit e = new Commit("E", d); |
| Commit f = new Commit("F", d); |
| DependencyGraph<Commit> testee = new DependencyGraph<>(Commit::getParent); |
| Stream.of(b, a, e, d, f, c) |
| .forEach(testee::registerItem); |
| |
| //When |
| Stream<Commit> actual = testee.getBuildChain(); |
| |
| //Then |
| assertThat(actual).extracting(Commit::getMessage).containsExactly("A", "D", "B", "E", "F", "C"); |
| } |
| |
| @Test |
| public void getBuildChainOnComplexTreeShouldWork() { |
| //Given |
| Commit a = new Commit("A"); |
| Commit b = new Commit("B", a); |
| Commit c = new Commit("C", a); |
| Commit d = new Commit("D", b); |
| Commit e = new Commit("E", b); |
| Commit f = new Commit("F", c); |
| Commit g = new Commit("G", e); |
| DependencyGraph<Commit> testee = new DependencyGraph<>(Commit::getParent); |
| Stream.of(b, a, e, g, d, f, c) |
| .forEach(testee::registerItem); |
| |
| //When |
| Stream<Commit> actual = testee.getBuildChain(); |
| |
| //Then |
| assertThat(actual).extracting(Commit::getMessage).containsExactly("A", "B", "C", "E", "D", "F", "G"); |
| } |
| |
| @Test(expected = CycleDetectedException.class) |
| public void getBuildChainOnTreeWithLoopShouldFail() { |
| //Given |
| Commit a = new Commit("A"); |
| Commit b = new Commit("B", a); |
| a.setParent(b); |
| DependencyGraph<Commit> testee = new DependencyGraph<>(Commit::getParent); |
| Stream.of(a, b) |
| .forEach(testee::registerItem); |
| |
| //When |
| testee.getBuildChain(); |
| } |
| |
| @Test(expected = CycleDetectedException.class) |
| public void getBuildChainOnTreeWithComplexLoopShouldFail() { |
| // a - b |
| // c - d - e - f |
| // |___________| |
| //Given |
| Commit a = new Commit("A"); |
| Commit b = new Commit("B", a); |
| |
| Commit c = new Commit("C"); |
| Commit d = new Commit("D", c); |
| Commit e = new Commit("E", d); |
| Commit f = new Commit("F", e); |
| c.setParent(f); |
| DependencyGraph<Commit> testee = new DependencyGraph<>(Commit::getParent); |
| Stream.of(a, b, c, d, e, f) |
| .forEach(testee::registerItem); |
| |
| //When |
| testee.getBuildChain(); |
| } |
| |
| |
| private static class Commit { |
| private final String message; |
| private Optional<Commit> parent; |
| |
| @VisibleForTesting |
| Commit(String message) { |
| this(message, null); |
| } |
| |
| @VisibleForTesting |
| Commit(String message, Commit parent) { |
| Preconditions.checkArgument(message != null); |
| this.message = message; |
| this.parent = Optional.ofNullable(parent); |
| } |
| |
| public Optional<Commit> getParent() { |
| return parent; |
| } |
| |
| public void setParent(Commit parent) { |
| this.parent = Optional.of(parent); |
| } |
| |
| public String getMessage() { |
| return message; |
| } |
| } |
| } |