TestScalingValue.java see http://henrikwarne.com/2014/02/09/unit-testing-private-methods/

gistfile1.txt

package com.example.testphone.node.generator;

import junit.framework.TestCase;

import java.util.ArrayList;
import java.util.Arrays;

/**
 * @author Henrik Warne
 */
public class TestScalingValue extends TestCase {

    public  void test_setTimeAnchors_zeroValues_gives100() {
        ScalingValue scalingValue = new ScalingValue(new ArrayList<Integer>());
        scalingValue.setTimeAnchors(0, 1000);
        assertEquals(2, scalingValue.valueList.size());
        assertEquals(100, scalingValue.valueList.get(0).scalePercentage);
        assertEquals(0, scalingValue.valueList.get(0).anchorTimeStamp);

        assertEquals(100, scalingValue.valueList.get(1).scalePercentage);
        assertEquals(1000, scalingValue.valueList.get(1).anchorTimeStamp);
    }

    public  void test_setTimeAnchors_oneValues_duplicated() {
        ScalingValue scalingValue = new ScalingValue(new ArrayList<>(Arrays.asList(60)));
        scalingValue.setTimeAnchors(0, 1000);
        assertEquals(2, scalingValue.valueList.size());
        assertEquals(60, scalingValue.valueList.get(0).scalePercentage);
        assertEquals(0, scalingValue.valueList.get(0).anchorTimeStamp);

        assertEquals(60, scalingValue.valueList.get(1).scalePercentage);
        assertEquals(1000, scalingValue.valueList.get(1).anchorTimeStamp);
    }

    public  void test_setTimeAnchors_twoValues() {
        ScalingValue scalingValue = new ScalingValue(new ArrayList<>(Arrays.asList(100,0)));
        scalingValue.setTimeAnchors(0, 1000);
        assertEquals(2, scalingValue.valueList.size());
        assertEquals(100, scalingValue.valueList.get(0).scalePercentage);
        assertEquals(0, scalingValue.valueList.get(0).anchorTimeStamp);

        assertEquals(0, scalingValue.valueList.get(1).scalePercentage);
        assertEquals(1000, scalingValue.valueList.get(1).anchorTimeStamp);
    }

    public  void test_setTimeAnchors_threeValues() {
        ScalingValue scalingValue = new ScalingValue(new ArrayList<>(Arrays.asList(0, 100, 60)));
        scalingValue.setTimeAnchors(0, 1000);
        assertEquals(3, scalingValue.valueList.size());
        assertEquals(0, scalingValue.valueList.get(0).scalePercentage);
        assertEquals(0, scalingValue.valueList.get(0).anchorTimeStamp);

        assertEquals(100, scalingValue.valueList.get(1).scalePercentage);
        assertEquals(500, scalingValue.valueList.get(1).anchorTimeStamp);

        assertEquals(60, scalingValue.valueList.get(2).scalePercentage);
        assertEquals(1000, scalingValue.valueList.get(2).anchorTimeStamp);
    }

    public void testGetCurrentRate_timeAnchorsNotSet_exception() {
        ScalingValue scalingValue = new ScalingValue(new ArrayList<>(Arrays.asList(0, 100, 60)));
        try {
            scalingValue.getCurrentRate(0, 10.0);
            fail();
        } catch (IllegalArgumentException e) {
            // expected
        }
    }

    public void testGetNextIndex() {
        ScalingValue scalingValue = new ScalingValue(new ArrayList<>(Arrays.asList(0, 100, 60)));
        scalingValue.setTimeAnchors(0, 1000);

        assertEquals(1, scalingValue.getNextIndex(0));
        assertEquals(1, scalingValue.getNextIndex(499));
        assertEquals(2, scalingValue.getNextIndex(500));
        assertEquals(2, scalingValue.getNextIndex(999));
        assertEquals(2, scalingValue.getNextIndex(1000));
    }

    public void testGetScalingFactor() {
        ScalingValue scalingValue = new ScalingValue(new ArrayList<>(Arrays.asList(0, 100, 60)));
        scalingValue.setTimeAnchors(0, 1000);

        long now;
        now = 250;
        int i;
        ScalingValue.Value prev;
        ScalingValue.Value next;
        i = scalingValue.getNextIndex(now);
        prev = scalingValue.valueList.get(i-1);
        next = scalingValue.valueList.get(i);
        assertEquals(0.5, scalingValue.getScalingFactor(prev, next, now));

        now = 750;
        i = scalingValue.getNextIndex(now);
        prev = scalingValue.valueList.get(i-1);
        next = scalingValue.valueList.get(i);
        assertEquals(0.8, scalingValue.getScalingFactor(prev, next, now));

    }

    public void test_getCurrentRate_twoValues() {
        ScalingValue scalingValue = new ScalingValue(new ArrayList<>(Arrays.asList(100,0)));
        scalingValue.setTimeAnchors(0, 1000);
        assertEquals(10.0, scalingValue.getCurrentRate(0, 10.0));
        assertEquals(8.0, scalingValue.getCurrentRate(200, 10.0));
        assertEquals(5.0, scalingValue.getCurrentRate(500, 10.0));
        assertEquals(4.0, scalingValue.getCurrentRate(600, 10.0));
        assertEquals(2.0, scalingValue.getCurrentRate(800, 10.0));
    }

    public void test_getCurrentRate_threeValues() {
        ScalingValue scalingValue = new ScalingValue(new ArrayList<>(Arrays.asList(100,0,100,0,100)));
        scalingValue.setTimeAnchors(4000, 1000);
        assertEquals(10.0, scalingValue.getCurrentRate(0, 10.0));
        assertEquals(10.0, scalingValue.getCurrentRate(4000, 10.0));
        assertEquals(15.0, scalingValue.getCurrentRate(4125, 30.0));
        assertEquals(0.0, scalingValue.getCurrentRate(4250, 10.0));
        assertEquals(5.0, scalingValue.getCurrentRate(4375, 10.0));
        assertEquals(10.0, scalingValue.getCurrentRate(4500, 10.0));
        assertEquals(0.0, scalingValue.getCurrentRate(4750, 10.0));
        assertEquals(10.0, scalingValue.getCurrentRate(5000, 10.0));
        assertEquals(10.0, scalingValue.getCurrentRate(6000, 10.0));
    }
}