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      1 /*
      2  * Copyright (C) 2014 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package android.hardware.cts.helpers.sensorverification;
     18 
     19 import junit.framework.TestCase;
     20 
     21 import android.hardware.cts.helpers.SensorStats;
     22 import android.hardware.cts.helpers.TestSensorEnvironment;
     23 import android.hardware.cts.helpers.TestSensorEvent;
     24 
     25 import java.util.ArrayList;
     26 import java.util.Collection;
     27 
     28 /**
     29  * Tests for {@link StandardDeviationVerification}.
     30  */
     31 public class StandardDeviationVerificationTest extends TestCase {
     32 
     33     /**
     34      * Test {@link StandardDeviationVerification#verify(TestSensorEnvironment, SensorStats)}.
     35      */
     36     public void testVerify() {
     37         // Stddev should be {sqrt(2.5), sqrt(2.5), sqrt(2.5)}
     38         float[][] values = {
     39                 {0, 1, 0},
     40                 {1, 2, 2},
     41                 {2, 3, 4},
     42                 {3, 4, 6},
     43                 {4, 5, 8},
     44         };
     45         float[] standardDeviations = {
     46                 (float) Math.sqrt(2.5), (float) Math.sqrt(2.5), (float) Math.sqrt(10.0)
     47         };
     48 
     49         float[] threshold = {2, 2, 4};
     50         runVerification(threshold, values, true, standardDeviations);
     51 
     52         threshold = new float[]{1, 2, 4};
     53         runVerification(threshold, values, false, standardDeviations);
     54 
     55         threshold = new float[]{2, 1, 4};
     56         runVerification(threshold, values, false, standardDeviations);
     57 
     58         threshold = new float[]{2, 2, 3};
     59         runVerification(threshold, values, false, standardDeviations);
     60     }
     61 
     62     private void runVerification(float[] threshold, float[][] values, boolean pass,
     63             float[] standardDeviations) {
     64         SensorStats stats = new SensorStats();
     65         StandardDeviationVerification verification = getVerification(threshold, values);
     66         if (pass) {
     67             verification.verify(stats);
     68         } else {
     69             boolean failed = false;
     70             try {
     71                 verification.verify(stats);
     72             } catch (AssertionError e) {
     73                 // Expected;
     74                 failed = true;
     75             }
     76             assertTrue("Expected an AssertionError", failed);
     77         }
     78         assertEquals(pass, stats.getValue(StandardDeviationVerification.PASSED_KEY));
     79         float[] actual = (float[]) stats.getValue(SensorStats.STANDARD_DEVIATION_KEY);
     80         for (int i = 0; i < standardDeviations.length; i++) {
     81             assertEquals(standardDeviations[i], actual[i], 0.1);
     82         }
     83     }
     84 
     85     private static StandardDeviationVerification getVerification(
     86             float[] threshold,
     87             float[] ... values) {
     88         Collection<TestSensorEvent> events = new ArrayList<>(values.length);
     89         for (float[] value : values) {
     90             events.add(new TestSensorEvent(null, 0, 0, value));
     91         }
     92         StandardDeviationVerification verification = new StandardDeviationVerification(threshold);
     93         verification.addSensorEvents(events);
     94         return verification;
     95     }
     96 }
     97