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1 /*
2  * Copyright 2018 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 #include <gtest/gtest.h>
18 
19 #include <media/EventMetric.h>
20 
21 namespace android {
22 
23 /**
24  * Unit tests for the EventMetric class.
25  */
26 
TEST(EventMetricTest,IntDataTypeEmpty)27 TEST(EventMetricTest, IntDataTypeEmpty) {
28   EventMetric<int> metric("MyMetricName", "MetricAttributeName");
29 
30   std::map<int, EventStatistics> values;
31 
32   metric.ExportValues(
33       [&] (int attribute_value, const EventStatistics& value) {
34           values[attribute_value] = value;
35       });
36 
37   EXPECT_TRUE(values.empty());
38 }
39 
TEST(EventMetricTest,IntDataType)40 TEST(EventMetricTest, IntDataType) {
41   EventMetric<int> metric("MyMetricName", "MetricAttributeName");
42 
43   std::map<int, EventStatistics> values;
44 
45   metric.Record(4, 7);
46   metric.Record(5, 8);
47   metric.Record(5, 8);
48   metric.Record(5, 8);
49   metric.Record(6, 8);
50   metric.Record(6, 8);
51   metric.Record(6, 8);
52 
53   metric.ExportValues(
54       [&] (int attribute_value, const EventStatistics& value) {
55           values[attribute_value] = value;
56       });
57 
58   ASSERT_EQ(2u, values.size());
59   EXPECT_EQ(4, values[7].min);
60   EXPECT_EQ(4, values[7].max);
61   EXPECT_EQ(4, values[7].mean);
62   EXPECT_EQ(1, values[7].count);
63 
64   EXPECT_EQ(5, values[8].min);
65   EXPECT_EQ(6, values[8].max);
66   // This is an approximate value because of the technique we're using.
67   EXPECT_NEAR(5.5, values[8].mean, 0.2);
68   EXPECT_EQ(6, values[8].count);
69 }
70 
TEST(EventMetricTest,StringDataType)71 TEST(EventMetricTest, StringDataType) {
72   EventMetric<std::string> metric("MyMetricName", "MetricAttributeName");
73 
74   std::map<std::string, EventStatistics> values;
75 
76   metric.Record(1, "a");
77   metric.Record(2, "b");
78   metric.Record(2, "b");
79   metric.Record(3, "b");
80   metric.Record(3, "b");
81 
82   metric.ExportValues(
83       [&] (std::string attribute_value, const EventStatistics& value) {
84           values[attribute_value] = value;
85       });
86 
87   ASSERT_EQ(2u, values.size());
88   EXPECT_EQ(1, values["a"].min);
89   EXPECT_EQ(1, values["a"].max);
90   EXPECT_EQ(1, values["a"].mean);
91   EXPECT_EQ(1, values["a"].count);
92 
93   EXPECT_EQ(2, values["b"].min);
94   EXPECT_EQ(3, values["b"].max);
95   EXPECT_NEAR(2.5, values["b"].mean, 0.2);
96   EXPECT_EQ(4, values["b"].count);
97 }
98 
99 // Helper class that allows us to mock the clock.
100 template<typename AttributeType>
101 class MockEventTimer : public EventTimer<AttributeType> {
102  public:
MockEventTimer(nsecs_t time_delta_ns,EventMetric<AttributeType> * metric)103   explicit MockEventTimer(nsecs_t time_delta_ns,
104                           EventMetric<AttributeType>* metric)
105       : EventTimer<AttributeType>(metric) {
106     // Pretend the event started earlier.
107     this->start_time_ = systemTime() - time_delta_ns;
108   }
109 };
110 
TEST(EventTimerTest,IntDataType)111 TEST(EventTimerTest, IntDataType) {
112   EventMetric<int> metric("MyMetricName", "MetricAttributeName");
113 
114   for (int i = 0; i < 5; i++) {
115     {
116       // Add a mock time delta.
117       MockEventTimer<int> metric_timer(i * 1000000, &metric);
118       metric_timer.SetAttribute(i % 2);
119     }
120   }
121 
122   std::map<int, EventStatistics> values;
123   metric.ExportValues(
124       [&] (int attribute_value, const EventStatistics& value) {
125           values[attribute_value] = value;
126       });
127 
128   ASSERT_EQ(2u, values.size());
129   EXPECT_LT(values[0].min, values[0].max);
130   EXPECT_GE(4000, values[0].max);
131   EXPECT_GT(values[0].mean, values[0].min);
132   EXPECT_LE(values[0].mean, values[0].max);
133   EXPECT_EQ(3, values[0].count);
134 
135   EXPECT_LT(values[1].min, values[1].max);
136   EXPECT_GE(3000, values[1].max);
137   EXPECT_GT(values[1].mean, values[1].min);
138   EXPECT_LE(values[1].mean, values[1].max);
139   EXPECT_EQ(2, values[1].count);
140 }
141 
142 }  // namespace android
143