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/*
* Copyright (C) 2023 The Android Open Source Project
*
* 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.android.modules.expresslog;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
import androidx.test.filters.SmallTest;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;
@RunWith(JUnit4.class)
@SmallTest
public class ScaledRangeOptionsTest {
static {
System.loadLibrary("expresslog_test_jni");
}
private static final String TAG = ScaledRangeOptionsTest.class.getSimpleName();
@Test
public void testGetBinsCount() {
Histogram.ScaledRangeOptions options1 = new Histogram.ScaledRangeOptions(1, 100, 100, 2);
assertEquals(3, options1.getBinsCount());
Histogram.ScaledRangeOptions options10 = new Histogram.ScaledRangeOptions(10, 100, 100, 2);
assertEquals(12, options10.getBinsCount());
}
@Test(expected = IllegalArgumentException.class)
public void testConstructZeroBinsCount() {
new Histogram.ScaledRangeOptions(0, 100, 100, 2);
}
@Test(expected = IllegalArgumentException.class)
public void testConstructNegativeBinsCount() {
new Histogram.ScaledRangeOptions(-1, 100, 100, 2);
}
@Test(expected = IllegalArgumentException.class)
public void testConstructNegativeFirstBinWidth() {
new Histogram.ScaledRangeOptions(10, 100, -100, 2);
}
@Test(expected = IllegalArgumentException.class)
public void testConstructTooSmallFirstBinWidth() {
new Histogram.ScaledRangeOptions(10, 100, 0.5f, 2);
}
@Test(expected = IllegalArgumentException.class)
public void testConstructNegativeScaleFactor() {
new Histogram.ScaledRangeOptions(10, 100, 100, -2);
}
@Test(expected = IllegalArgumentException.class)
public void testConstructTooSmallScaleFactor() {
new Histogram.ScaledRangeOptions(10, 100, 100, 0.5f);
}
@Test(expected = IllegalArgumentException.class)
public void testConstructTooBigScaleFactor() {
new Histogram.ScaledRangeOptions(10, 100, 100, 500.f);
}
@Test(expected = IllegalArgumentException.class)
public void testConstructTooBigBinRange() {
new Histogram.ScaledRangeOptions(100, 100, 100, 10.f);
}
@Test
public void testBinIndexForRangeEqual1() {
Histogram.ScaledRangeOptions options = new Histogram.ScaledRangeOptions(10, 1, 1, 1);
assertEquals(12, options.getBinsCount());
assertEquals(11, options.getBinForSample(11));
for (int i = 0, bins = options.getBinsCount(); i < bins; i++) {
assertEquals(i, options.getBinForSample(i));
}
}
@Test
public void testBinIndexForRangeEqual2() {
// this should produce bin otpions similar to linear histogram with bin width 2
Histogram.ScaledRangeOptions options = new Histogram.ScaledRangeOptions(10, 1, 2, 1);
assertEquals(12, options.getBinsCount());
for (int i = 0, bins = options.getBinsCount(); i < bins; i++) {
assertEquals(i, options.getBinForSample(i * 2));
assertEquals(i, options.getBinForSample(i * 2 - 1));
}
}
@Test
public void testBinIndexForRangeEqual5() {
Histogram.ScaledRangeOptions options = new Histogram.ScaledRangeOptions(2, 0, 5, 1);
assertEquals(4, options.getBinsCount());
for (int i = 0; i < 2; i++) {
for (int sample = 0; sample < 5; sample++) {
assertEquals(i + 1, options.getBinForSample(i * 5 + sample));
}
}
}
@Test
public void testBinIndexForRangeEqual10() {
Histogram.ScaledRangeOptions options = new Histogram.ScaledRangeOptions(10, 1, 10, 1);
assertEquals(0, options.getBinForSample(0));
assertEquals(options.getBinsCount() - 2, options.getBinForSample(100));
assertEquals(options.getBinsCount() - 1, options.getBinForSample(101));
final float binSize = (101 - 1) / 10f;
for (int i = 1, bins = options.getBinsCount() - 1; i < bins; i++) {
assertEquals(i, options.getBinForSample(i * binSize));
}
}
@Test
public void testBinIndexForScaleFactor2() {
final int binsCount = 10;
final int minValue = 10;
final int firstBinWidth = 5;
final int scaledFactor = 2;
Histogram.ScaledRangeOptions options = new Histogram.ScaledRangeOptions(
binsCount, minValue, firstBinWidth, scaledFactor);
assertEquals(binsCount + 2, options.getBinsCount());
long[] binCounts = new long[10];
// precalculate max valid value - start value for the overflow bin
int lastBinStartValue = minValue; //firstBinMin value
int lastBinWidth = firstBinWidth;
for (int binIdx = 2; binIdx <= binsCount + 1; binIdx++) {
lastBinStartValue = lastBinStartValue + lastBinWidth;
lastBinWidth *= scaledFactor;
}
// underflow bin
for (int i = 1; i < minValue; i++) {
assertEquals(0, options.getBinForSample(i));
}
for (int i = 10; i < lastBinStartValue; i++) {
assertTrue(options.getBinForSample(i) > 0);
assertTrue(options.getBinForSample(i) <= binsCount);
binCounts[options.getBinForSample(i) - 1]++;
}
// overflow bin
assertEquals(binsCount + 1, options.getBinForSample(lastBinStartValue));
for (int i = 1; i < binsCount; i++) {
assertEquals(binCounts[i], binCounts[i - 1] * 2L);
}
}
}
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