Re-add encoder tests (#15312)

Co-authored-by: Balz Guenat <balz.guenat@gmail.com>

1 files changed, 144 insertions, 0 deletions

diff --git a/quantum/encoder/tests/encoder_tests.cpp b/quantum/encoder/tests/encoder_tests.cpp
new file mode 100644
index 0000000000..1888fdab8d
--- /dev/null
+++ b/quantum/encoder/tests/encoder_tests.cpp
@@ -0,0 +1,144 @@
+/* Copyright 2021 Balz Guenat
+ *
+ * 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 "gtest/gtest.h"
+#include "gmock/gmock.h"
+#include <vector>
+#include <algorithm>
+#include <stdio.h>
+
+extern "C" {
+#include "encoder.h"
+#include "encoder/tests/mock.h"
+}
+
+struct update {
+    int8_t index;
+    bool   clockwise;
+};
+
+uint8_t uidx = 0;
+update  updates[32];
+
+bool encoder_update_kb(uint8_t index, bool clockwise) {
+    updates[uidx % 32] = {index, clockwise};
+    uidx++;
+    return true;
+}
+
+bool setAndRead(pin_t pin, bool val) {
+    setPin(pin, val);
+    return encoder_read();
+}
+
+class EncoderTest : public ::testing::Test {};
+
+TEST_F(EncoderTest, TestInit) {
+    uidx = 0;
+    encoder_init();
+    EXPECT_EQ(pinIsInputHigh[0], true);
+    EXPECT_EQ(pinIsInputHigh[1], true);
+    EXPECT_EQ(uidx, 0);
+}
+
+TEST_F(EncoderTest, TestOneClockwise) {
+    uidx = 0;
+    encoder_init();
+    // send 4 pulses. with resolution 4, that's one step and we should get 1 update.
+    setAndRead(0, false);
+    setAndRead(1, false);
+    setAndRead(0, true);
+    setAndRead(1, true);
+
+    EXPECT_EQ(uidx, 1);
+    EXPECT_EQ(updates[0].index, 0);
+    EXPECT_EQ(updates[0].clockwise, true);
+}
+
+TEST_F(EncoderTest, TestOneCounterClockwise) {
+    uidx = 0;
+    encoder_init();
+    setAndRead(1, false);
+    setAndRead(0, false);
+    setAndRead(1, true);
+    setAndRead(0, true);
+
+    EXPECT_EQ(uidx, 1);
+    EXPECT_EQ(updates[0].index, 0);
+    EXPECT_EQ(updates[0].clockwise, false);
+}
+
+TEST_F(EncoderTest, TestTwoClockwiseOneCC) {
+    uidx = 0;
+    encoder_init();
+    setAndRead(0, false);
+    setAndRead(1, false);
+    setAndRead(0, true);
+    setAndRead(1, true);
+    setAndRead(0, false);
+    setAndRead(1, false);
+    setAndRead(0, true);
+    setAndRead(1, true);
+    setAndRead(1, false);
+    setAndRead(0, false);
+    setAndRead(1, true);
+    setAndRead(0, true);
+
+    EXPECT_EQ(uidx, 3);
+    EXPECT_EQ(updates[0].index, 0);
+    EXPECT_EQ(updates[0].clockwise, true);
+    EXPECT_EQ(updates[1].index, 0);
+    EXPECT_EQ(updates[1].clockwise, true);
+    EXPECT_EQ(updates[2].index, 0);
+    EXPECT_EQ(updates[2].clockwise, false);
+}
+
+TEST_F(EncoderTest, TestNoEarly) {
+    uidx = 0;
+    encoder_init();
+    // send 3 pulses. with resolution 4, that's not enough for a step.
+    setAndRead(0, false);
+    setAndRead(1, false);
+    setAndRead(0, true);
+    EXPECT_EQ(uidx, 0);
+    // now send last pulse
+    setAndRead(1, true);
+    EXPECT_EQ(uidx, 1);
+    EXPECT_EQ(updates[0].index, 0);
+    EXPECT_EQ(updates[0].clockwise, true);
+}
+
+TEST_F(EncoderTest, TestHalfway) {
+    uidx = 0;
+    encoder_init();
+    // go halfway
+    setAndRead(0, false);
+    setAndRead(1, false);
+    EXPECT_EQ(uidx, 0);
+    // back off
+    setAndRead(1, true);
+    setAndRead(0, true);
+    EXPECT_EQ(uidx, 0);
+    // go all the way
+    setAndRead(0, false);
+    setAndRead(1, false);
+    setAndRead(0, true);
+    setAndRead(1, true);
+    // should result in 1 update
+    EXPECT_EQ(uidx, 1);
+    EXPECT_EQ(updates[0].index, 0);
+    EXPECT_EQ(updates[0].clockwise, true);
+}