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-rw-r--r--tests/audio/test_audio.cpp118
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diff --git a/tests/audio/test_audio.cpp b/tests/audio/test_audio.cpp
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+// Copyright 2023 Google LLC
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 2 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+#include <cmath>
+#include <random>
+
+#include "gtest/gtest.h"
+#include "keyboard_report_util.hpp"
+#include "test_common.hpp"
+
+namespace {
+
+class AudioTest : public TestFixture {
+ public:
+ uint16_t infer_tempo() {
+ return audio_ms_to_duration(1875) / 2;
+ }
+};
+
+TEST_F(AudioTest, OnOffToggle) {
+ audio_on();
+ EXPECT_TRUE(audio_is_on());
+
+ audio_off();
+ EXPECT_FALSE(audio_is_on());
+
+ audio_toggle();
+ EXPECT_TRUE(audio_is_on());
+
+ audio_toggle();
+ EXPECT_FALSE(audio_is_on());
+}
+
+TEST_F(AudioTest, ChangeTempo) {
+ for (int tempo = 50; tempo <= 250; tempo += 50) {
+ audio_set_tempo(tempo);
+ EXPECT_EQ(infer_tempo(), tempo);
+ }
+
+ audio_set_tempo(10);
+ audio_increase_tempo(25);
+ EXPECT_EQ(infer_tempo(), 35);
+
+ audio_decrease_tempo(4);
+ EXPECT_EQ(infer_tempo(), 31);
+
+ audio_increase_tempo(250);
+ EXPECT_EQ(infer_tempo(), 255);
+
+ audio_set_tempo(9);
+ EXPECT_EQ(infer_tempo(), 10);
+
+ audio_decrease_tempo(100);
+ EXPECT_EQ(infer_tempo(), 10);
+}
+
+TEST_F(AudioTest, BpmConversion) {
+ const int tol = 1;
+
+ audio_set_tempo(120);
+ // At 120 bpm, there are 2 beats per second, and a whole note is 500 ms.
+ EXPECT_NEAR(audio_duration_to_ms(64 /* whole note */), 500, tol);
+ EXPECT_NEAR(audio_ms_to_duration(500), 64, tol);
+ EXPECT_EQ(audio_duration_to_ms(0), 0);
+ EXPECT_EQ(audio_ms_to_duration(0), 0);
+
+ audio_set_tempo(10);
+ // At 10 bpm, UINT16_MAX ms corresponds to 699/64 beats and is the longest
+ // duration that can be converted without overflow.
+ EXPECT_NEAR(audio_ms_to_duration(UINT16_MAX), 699, tol);
+ EXPECT_NEAR(audio_duration_to_ms(699), 65531, tol);
+
+ audio_set_tempo(255);
+ // At 255 bpm, UINT16_MAX ms corresponds to 17825/64 beats and is the longest
+ // duration that can be converted without overflow.
+ EXPECT_NEAR(audio_ms_to_duration(UINT16_MAX), 17825, tol);
+ EXPECT_NEAR(audio_duration_to_ms(17825), 65533, tol);
+
+ std::mt19937 rng(0 /*seed*/);
+ std::uniform_int_distribution<int> dist_tempo(10, 255);
+ std::uniform_int_distribution<int> dist_ms(0, UINT16_MAX);
+
+ // Test bpm <-> ms conversions for random tempos and durations.
+ for (int trial = 0; trial < 50; ++trial) {
+ const int tempo = dist_tempo(rng);
+ const int duration_ms = dist_ms(rng);
+ SCOPED_TRACE("tempo " + testing::PrintToString(tempo) + ", duration " + testing::PrintToString(duration_ms) + " ms");
+
+ audio_set_tempo(tempo);
+ int duration_bpm = std::round((64.0f / (60.0f * 1000.0f)) * duration_ms * tempo);
+ ASSERT_NEAR(audio_ms_to_duration(duration_ms), duration_bpm, tol);
+
+ int roundtrip_ms = std::round((60.0f * 1000.0f / 64.0f) * duration_bpm / tempo);
+ // Because of round-off error, duration_ms and roundtrip_ms may differ by
+ // about (60 * 1000 / 64) / tempo.
+ int roundtrip_tol = tol * (60.0f * 1000.0f / 64.0f) / tempo;
+ ASSERT_NEAR(roundtrip_ms, duration_ms, roundtrip_tol);
+
+ // Only test converting back to ms if the result would be in uint16_t range.
+ if (roundtrip_ms <= UINT16_MAX) {
+ ASSERT_NEAR(audio_duration_to_ms(duration_bpm), roundtrip_ms, tol);
+ }
+ }
+}
+
+} // namespace