Add new class to create cpu usage time series.

RELNOTES: None
PiperOrigin-RevId: 208462186

1 files changed, 79 insertions, 0 deletions

diff --git a/src/test/java/com/google/devtools/build/lib/profiler/CpuUsageTimeSeriesTest.java b/src/test/java/com/google/devtools/build/lib/profiler/CpuUsageTimeSeriesTest.java
new file mode 100644
index 0000000000..9d375308c9
--- /dev/null
+++ b/src/test/java/com/google/devtools/build/lib/profiler/CpuUsageTimeSeriesTest.java
@@ -0,0 +1,79 @@
+// Copyright 2018 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.profiler;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import java.util.Arrays;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.JUnit4;
+
+/** Tests for {@link CpuUsageTimeSeries}. */
+@RunWith(JUnit4.class)
+public final class CpuUsageTimeSeriesTest {
+  @Test
+  public void testAddRange() {
+    CpuUsageTimeSeries cpuUsageTimeSeries = new CpuUsageTimeSeries(42, 100);
+    cpuUsageTimeSeries.addRange(42, 142);
+    cpuUsageTimeSeries.addRange(442, 542);
+    double[] values = cpuUsageTimeSeries.toDoubleArray(5);
+    assertThat(values).usingTolerance(1.0e-10).containsExactly(1, 0, 0, 0, 1).inOrder();
+  }
+
+  @Test
+  public void testAddRangeWithValue() {
+    CpuUsageTimeSeries cpuUsageTimeSeries = new CpuUsageTimeSeries(42, 100);
+    cpuUsageTimeSeries.addRange(42, 242, 3);
+    cpuUsageTimeSeries.addRange(442, 542, 0.5);
+    double[] values = cpuUsageTimeSeries.toDoubleArray(5);
+    assertThat(values).usingTolerance(1.0e-10).containsExactly(3, 3, 0, 0, .5).inOrder();
+  }
+
+  @Test
+  public void testAddRangeOverlappingWithValue() {
+    CpuUsageTimeSeries cpuUsageTimeSeries = new CpuUsageTimeSeries(42, 100);
+    cpuUsageTimeSeries.addRange(42, 242, 3);
+    cpuUsageTimeSeries.addRange(142, 442, 0.5);
+    double[] values = cpuUsageTimeSeries.toDoubleArray(5);
+    assertThat(values).usingTolerance(1.0e-10).containsExactly(3, 3.5, 0.5, 0.5, 0).inOrder();
+  }
+
+  @Test
+  public void testAddRangeFractions() {
+    CpuUsageTimeSeries cpuUsageTimeSeries = new CpuUsageTimeSeries(42, 100);
+    cpuUsageTimeSeries.addRange(92, 267);
+    double[] values = cpuUsageTimeSeries.toDoubleArray(5);
+    assertThat(values).usingTolerance(1.0e-10).containsExactly(0.5, 1, 0.25, 0, 0).inOrder();
+  }
+
+  @Test
+  public void testAddRangeWithValueFractions() {
+    CpuUsageTimeSeries cpuUsageTimeSeries = new CpuUsageTimeSeries(42, 100);
+    cpuUsageTimeSeries.addRange(92, 267, 3);
+    double[] values = cpuUsageTimeSeries.toDoubleArray(5);
+    assertThat(values).usingTolerance(1.0e-10).containsExactly(1.5, 3, 0.75, 0, 0).inOrder();
+  }
+
+  @Test
+  public void testResize() {
+    CpuUsageTimeSeries cpuUsageTimeSeries = new CpuUsageTimeSeries(0, 100);
+    cpuUsageTimeSeries.addRange(0, 100 * 100 + 1, 42);
+    double[] values = cpuUsageTimeSeries.toDoubleArray(101);
+    double[] expected = new double[101];
+    Arrays.fill(expected, 0, expected.length - 1, 42);
+    expected[expected.length - 1] = 0.42;
+    assertThat(values).usingTolerance(1.0e-10).containsExactly(expected).inOrder();
+  }
+}