Open source graph tests

--
MOS_MIGRATED_REVID=107978531

src/test/java/com/google/devtools/build/lib/BUILD

diff --git a/src/test/java/com/google/devtools/build/lib/BUILD b/src/test/java/com/google/devtools/build/lib/BUILD
index 990ae34..f3d0b6a 100644
--- a/src/test/java/com/google/devtools/build/lib/BUILD
+++ b/src/test/java/com/google/devtools/build/lib/BUILD
@@ -458,6 +458,27 @@
     ],
 )
 
+java_test(
+    name = "graph_test",
+    srcs = glob([
+        "graph/*.java",
+    ]),
+    args = ["com.google.devtools.build.lib.AllTests"],
+    deps = [
+        ":foundations_testutil",
+        ":test_runner",
+        ":testutil",
+        "//src/main/java/com/google/devtools/build/lib:cmdline",
+        "//src/main/java/com/google/devtools/build/lib:collect",
+        "//src/main/java/com/google/devtools/build/lib:events",
+        "//src/main/java/com/google/devtools/build/lib:graph",
+        "//src/main/java/com/google/devtools/build/lib:packages-internal",
+        "//third_party:guava",
+        "//third_party:junit4",
+        "//third_party:truth",
+    ],
+)
+
 java_library(
     name = "packages_testutil",
     srcs = glob([

src/test/java/com/google/devtools/build/lib/graph/DigraphTest.java

diff --git a/src/test/java/com/google/devtools/build/lib/graph/DigraphTest.java b/src/test/java/com/google/devtools/build/lib/graph/DigraphTest.java
new file mode 100644
index 0000000..14959c7
--- /dev/null
+++ b/src/test/java/com/google/devtools/build/lib/graph/DigraphTest.java
@@ -0,0 +1,149 @@
+// Copyright 2015 The Bazel Authors. All rights reserved.
+//
+// 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 com.google.devtools.build.lib.graph;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import com.google.common.base.Function;
+import com.google.common.collect.ImmutableList;
+import com.google.common.collect.Lists;
+import com.google.devtools.build.lib.cmdline.Label;
+import com.google.devtools.build.lib.events.Location;
+import com.google.devtools.build.lib.packages.License;
+import com.google.devtools.build.lib.packages.License.DistributionType;
+import com.google.devtools.build.lib.packages.Package;
+import com.google.devtools.build.lib.packages.Rule;
+import com.google.devtools.build.lib.packages.RuleVisibility;
+import com.google.devtools.build.lib.packages.Target;
+
+import junit.framework.TestCase;
+
+import java.util.Comparator;
+import java.util.List;
+import java.util.Set;
+
+/**
+ * Test for {@link Digraph}.
+ */
+public class DigraphTest extends TestCase {
+
+  class FakeTarget implements Target {
+
+    private final Label label;
+
+    FakeTarget(Label label) {
+      this.label = label;
+    }
+
+    @Override
+    public Label getLabel() {
+      return label;
+    }
+
+    @Override
+    public String getName() {
+      return null;
+    }
+
+    @Override
+    public Package getPackage() {
+      return null;
+    }
+
+    @Override
+    public String getTargetKind() {
+      return null;
+    }
+
+    @Override
+    public Rule getAssociatedRule() {
+      return null;
+    }
+
+    @Override
+    public License getLicense() {
+      return null;
+    }
+
+    @Override
+    public Location getLocation() {
+      return null;
+    }
+
+    @Override
+    public Set<DistributionType> getDistributions() {
+      return null;
+    }
+
+    @Override
+    public RuleVisibility getVisibility() {
+      return null;
+    }
+
+    @Override
+    public boolean isConfigurable() {
+      return true;
+    }
+  }
+
+  public void testStableOrdering() throws Exception {
+    Digraph<Target> digraph = new Digraph<>();
+    FakeTarget a = new FakeTarget(Label.create("pkg", "a"));
+    FakeTarget b = new FakeTarget(Label.create("pkg", "b"));
+    FakeTarget c = new FakeTarget(Label.create("pkg", "c"));
+    FakeTarget d = new FakeTarget(Label.create("pkg", "d"));
+    FakeTarget e = new FakeTarget(Label.create("pkg", "e"));
+    FakeTarget f = new FakeTarget(Label.create("pkg", "f"));
+    FakeTarget g = new FakeTarget(Label.create("pkg", "g"));
+    //    f
+    // / | | \
+    // c g e d
+    //      / \
+    //      a  b
+    digraph.addEdge(f, c);
+    digraph.addEdge(f, g);
+    digraph.addEdge(d, a);
+    digraph.addEdge(d, b);
+    digraph.addEdge(f, e);
+    digraph.addEdge(f, d);
+
+    // Get them back in topological and, within a valid topological ordering, alphabetical order.
+    Comparator<Target> comparator = new Comparator<Target>() {
+      @Override
+      public int compare(Target o1, Target o2) {
+        return o1.getLabel().compareTo(o2.getLabel()) * -1;
+      }
+    };
+
+    // Unwrap the Label from the Node<Target>, to make the final assert prettier.
+    Function<? super Node<Target>, ? extends Label> unwrap = new Function<Node<Target>, Label>() {
+      @Override
+      public Label apply(Node<Target> node) {
+        return node.getLabel().getLabel();
+      }
+    };
+    List<Label> nodes = Lists.transform(digraph.getTopologicalOrder(comparator), unwrap);
+    assertThat(nodes)
+        .containsExactlyElementsIn(
+            ImmutableList.of(
+                Label.create("pkg", "f"),
+                Label.create("pkg", "c"),
+                Label.create("pkg", "d"),
+                Label.create("pkg", "a"),
+                Label.create("pkg", "b"),
+                Label.create("pkg", "e"),
+                Label.create("pkg", "g")));
+  }
+}