Update from Google.

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MOE_MIGRATED_REVID=85702957

1 files changed, 134 insertions, 0 deletions

diff --git a/src/test/java/com/google/devtools/build/lib/collect/nestedset/RecordingUniqueifierTest.java b/src/test/java/com/google/devtools/build/lib/collect/nestedset/RecordingUniqueifierTest.java
new file mode 100644
index 0000000000..9764f4df53
--- /dev/null
+++ b/src/test/java/com/google/devtools/build/lib/collect/nestedset/RecordingUniqueifierTest.java
@@ -0,0 +1,134 @@
+// Copyright 2014 Google Inc. 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.collect.nestedset;
+
+import static org.junit.Assert.assertEquals;
+
+import com.google.common.base.Preconditions;
+import com.google.common.collect.ImmutableList;
+
+import junit.framework.TestCase;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.JUnit4;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.LinkedHashSet;
+import java.util.List;
+import java.util.Random;
+
+/**
+ * Tests for {@link RecordingUniqueifier}.
+ */
+@RunWith(JUnit4.class)
+public class RecordingUniqueifierTest extends TestCase {
+
+  private static final Random RANDOM = new Random();
+  
+  private static final int VERY_SMALL = 3; // one byte
+  private static final int SMALL = 11;     // two bytes
+  private static final int MEDIUM = 18;    // three bytes -- unmemoed
+  // For this one, the "* 8" is a bytes to bits (1 memo is 1 bit)
+  private static final int LARGE = (RecordingUniqueifier.LENGTH_THRESHOLD * 8) + 3;
+
+  private static final int[] SIZES = new int[] {VERY_SMALL, SMALL, MEDIUM, LARGE};
+  
+  private void doTest(int uniqueInputs, int deterministicHeadSize) throws Exception {
+    Preconditions.checkArgument(deterministicHeadSize <= uniqueInputs,
+        "deterministicHeadSize must be smaller than uniqueInputs");
+
+      // Setup
+
+      List<Integer> inputList = new ArrayList<>(uniqueInputs);
+      Collection<Integer> inputsDeduped = new LinkedHashSet<>(uniqueInputs);
+
+      for (int i = 0; i < deterministicHeadSize; i++) { // deterministic head
+        inputList.add(i);
+        inputsDeduped.add(i);
+      }
+
+      while (inputsDeduped.size() < uniqueInputs) { // random selectees
+        Integer i = RANDOM.nextInt(uniqueInputs);
+        inputList.add(i);
+        inputsDeduped.add(i);
+      }
+
+      // Unmemoed run
+
+      List<Integer> firstList = new ArrayList<>(uniqueInputs);
+      RecordingUniqueifier recordingUniqueifier = new RecordingUniqueifier();
+      for (Integer i : inputList) {
+        if (recordingUniqueifier.isUnique(i)) {
+          firstList.add(i);
+        }
+      }
+
+      // Potentially memo'ed run
+
+      List<Integer> secondList = new ArrayList<>(uniqueInputs);
+      Object memo = recordingUniqueifier.getMemo();
+      Uniqueifier uniqueifier = RecordingUniqueifier.createReplayUniqueifier(memo);
+      for (Integer i : inputList) {
+        if (uniqueifier.isUnique(i)) {
+          secondList.add(i);
+        }
+      }
+
+      // Evaluate results
+
+      inputsDeduped = ImmutableList.copyOf(inputsDeduped);
+      assertEquals("Unmemo'ed run has unexpected contents", inputsDeduped, firstList);
+      assertEquals("Memo'ed run has unexpected contents", inputsDeduped, secondList);
+  }
+
+  private void doTestWithLucidException(int uniqueInputs, int deterministicHeadSize)
+      throws Exception {
+    try {
+      doTest(uniqueInputs, deterministicHeadSize);
+    } catch (Exception e) {
+      throw new Exception("Failure in size: " + uniqueInputs, e);
+    }
+  }
+
+  @Test
+  public void noInputs() throws Exception {
+    doTestWithLucidException(0, 0);
+  }
+  
+  @Test
+  public void allUnique() throws Exception {
+    for (int size : SIZES) {
+      doTestWithLucidException(size, size);
+    }
+  }
+
+  @Test
+  public void fuzzedWithDeterministic2() throws Exception {
+    // The way that it is used, we know that the first two additions are not equal.
+    // Optimizations were made for this case in small memos.
+    for (int size : SIZES) {
+      doTestWithLucidException(size, 2);
+    }
+  }
+
+  @Test
+  public void fuzzedWithDeterministic2_otherSizes() throws Exception {
+    for (int i = 0; i < 100; i++) {
+      int size = RANDOM.nextInt(10000) + 2;
+      doTestWithLucidException(size, 2);
+    }
+  }
+}