Asymmetric encoders, encoder tests. (#16068)

16 files changed, 783 insertions, 85 deletions

diff --git a/quantum/encoder/tests/config_mock.h b/quantum/encoder/tests/config_mock.h
new file mode 100644
index 0000000000..703dcaf103
--- /dev/null
+++ b/quantum/encoder/tests/config_mock.h
@@ -0,0 +1,22 @@
+// Copyright 2022 Nick Brassel (@tzarc)
+// SPDX-License-Identifier: GPL-2.0-or-later
+#pragma once
+
+#define MATRIX_ROWS 1
+#define MATRIX_COLS 1
+
+/* Here, "pins" from 0 to 31 are allowed. */
+#define ENCODERS_PAD_A \
+    { 0 }
+#define ENCODERS_PAD_B \
+    { 1 }
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "mock.h"
+
+#ifdef __cplusplus
+};
+#endif
diff --git a/quantum/encoder/tests/config_mock_split_left_eq_right.h b/quantum/encoder/tests/config_mock_split_left_eq_right.h
new file mode 100644
index 0000000000..c80ac4d519
--- /dev/null
+++ b/quantum/encoder/tests/config_mock_split_left_eq_right.h
@@ -0,0 +1,26 @@
+// Copyright 2022 Nick Brassel (@tzarc)
+// SPDX-License-Identifier: GPL-2.0-or-later
+#pragma once
+
+#define MATRIX_ROWS 1
+#define MATRIX_COLS 1
+
+/* Here, "pins" from 0 to 31 are allowed. */
+#define ENCODERS_PAD_A \
+    { 0, 2 }
+#define ENCODERS_PAD_B \
+    { 1, 3 }
+#define ENCODERS_PAD_A_RIGHT \
+    { 4, 6 }
+#define ENCODERS_PAD_B_RIGHT \
+    { 5, 7 }
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "mock_split.h"
+
+#ifdef __cplusplus
+};
+#endif
diff --git a/quantum/encoder/tests/config_mock_split_left_gt_right.h b/quantum/encoder/tests/config_mock_split_left_gt_right.h
new file mode 100644
index 0000000000..91d5f3d605
--- /dev/null
+++ b/quantum/encoder/tests/config_mock_split_left_gt_right.h
@@ -0,0 +1,26 @@
+// Copyright 2022 Nick Brassel (@tzarc)
+// SPDX-License-Identifier: GPL-2.0-or-later
+#pragma once
+
+#define MATRIX_ROWS 1
+#define MATRIX_COLS 1
+
+/* Here, "pins" from 0 to 31 are allowed. */
+#define ENCODERS_PAD_A \
+    { 0, 2, 4 }
+#define ENCODERS_PAD_B \
+    { 1, 3, 5 }
+#define ENCODERS_PAD_A_RIGHT \
+    { 6, 8 }
+#define ENCODERS_PAD_B_RIGHT \
+    { 7, 9 }
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "mock_split.h"
+
+#ifdef __cplusplus
+};
+#endif
diff --git a/quantum/encoder/tests/config_mock_split_left_lt_right.h b/quantum/encoder/tests/config_mock_split_left_lt_right.h
new file mode 100644
index 0000000000..4108a184a6
--- /dev/null
+++ b/quantum/encoder/tests/config_mock_split_left_lt_right.h
@@ -0,0 +1,26 @@
+// Copyright 2022 Nick Brassel (@tzarc)
+// SPDX-License-Identifier: GPL-2.0-or-later
+#pragma once
+
+#define MATRIX_ROWS 1
+#define MATRIX_COLS 1
+
+/* Here, "pins" from 0 to 31 are allowed. */
+#define ENCODERS_PAD_A \
+    { 0, 2 }
+#define ENCODERS_PAD_B \
+    { 1, 3 }
+#define ENCODERS_PAD_A_RIGHT \
+    { 4, 6, 8 }
+#define ENCODERS_PAD_B_RIGHT \
+    { 5, 7, 9 }
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "mock_split.h"
+
+#ifdef __cplusplus
+};
+#endif
diff --git a/quantum/encoder/tests/config_mock_split_no_left.h b/quantum/encoder/tests/config_mock_split_no_left.h
new file mode 100644
index 0000000000..9db7fa7e41
--- /dev/null
+++ b/quantum/encoder/tests/config_mock_split_no_left.h
@@ -0,0 +1,26 @@
+// Copyright 2022 Nick Brassel (@tzarc)
+// SPDX-License-Identifier: GPL-2.0-or-later
+#pragma once
+
+#define MATRIX_ROWS 1
+#define MATRIX_COLS 1
+
+/* Here, "pins" from 0 to 31 are allowed. */
+#define ENCODERS_PAD_A \
+    {}
+#define ENCODERS_PAD_B \
+    {}
+#define ENCODERS_PAD_A_RIGHT \
+    { 0, 2 }
+#define ENCODERS_PAD_B_RIGHT \
+    { 1, 3 }
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "mock_split.h"
+
+#ifdef __cplusplus
+};
+#endif
diff --git a/quantum/encoder/tests/config_mock_split_no_right.h b/quantum/encoder/tests/config_mock_split_no_right.h
new file mode 100644
index 0000000000..14f18015e6
--- /dev/null
+++ b/quantum/encoder/tests/config_mock_split_no_right.h
@@ -0,0 +1,26 @@
+// Copyright 2022 Nick Brassel (@tzarc)
+// SPDX-License-Identifier: GPL-2.0-or-later
+#pragma once
+
+#define MATRIX_ROWS 1
+#define MATRIX_COLS 1
+
+/* Here, "pins" from 0 to 31 are allowed. */
+#define ENCODERS_PAD_A \
+    { 0, 2 }
+#define ENCODERS_PAD_B \
+    { 1, 3 }
+#define ENCODERS_PAD_A_RIGHT \
+    {}
+#define ENCODERS_PAD_B_RIGHT \
+    {}
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "mock_split.h"
+
+#ifdef __cplusplus
+};
+#endif
diff --git a/quantum/encoder/tests/encoder_tests.cpp b/quantum/encoder/tests/encoder_tests.cpp
index 1888fdab8d..b7c18aeec0 100644
--- a/quantum/encoder/tests/encoder_tests.cpp
+++ b/quantum/encoder/tests/encoder_tests.cpp
@@ -30,12 +30,12 @@ struct update {
     bool   clockwise;
 };
 
-uint8_t uidx = 0;
+uint8_t updates_array_idx = 0;
 update  updates[32];
 
 bool encoder_update_kb(uint8_t index, bool clockwise) {
-    updates[uidx % 32] = {index, clockwise};
-    uidx++;
+    updates[updates_array_idx % 32] = {index, clockwise};
+    updates_array_idx++;
     return true;
 }
 
@@ -47,15 +47,15 @@ bool setAndRead(pin_t pin, bool val) {
 class EncoderTest : public ::testing::Test {};
 
 TEST_F(EncoderTest, TestInit) {
-    uidx = 0;
+    updates_array_idx = 0;
     encoder_init();
     EXPECT_EQ(pinIsInputHigh[0], true);
     EXPECT_EQ(pinIsInputHigh[1], true);
-    EXPECT_EQ(uidx, 0);
+    EXPECT_EQ(updates_array_idx, 0);
 }
 
 TEST_F(EncoderTest, TestOneClockwise) {
-    uidx = 0;
+    updates_array_idx = 0;
     encoder_init();
     // send 4 pulses. with resolution 4, that's one step and we should get 1 update.
     setAndRead(0, false);
@@ -63,26 +63,26 @@ TEST_F(EncoderTest, TestOneClockwise) {
     setAndRead(0, true);
     setAndRead(1, true);
 
-    EXPECT_EQ(uidx, 1);
+    EXPECT_EQ(updates_array_idx, 1);
     EXPECT_EQ(updates[0].index, 0);
     EXPECT_EQ(updates[0].clockwise, true);
 }
 
 TEST_F(EncoderTest, TestOneCounterClockwise) {
-    uidx = 0;
+    updates_array_idx = 0;
     encoder_init();
     setAndRead(1, false);
     setAndRead(0, false);
     setAndRead(1, true);
     setAndRead(0, true);
 
-    EXPECT_EQ(uidx, 1);
+    EXPECT_EQ(updates_array_idx, 1);
     EXPECT_EQ(updates[0].index, 0);
     EXPECT_EQ(updates[0].clockwise, false);
 }
 
 TEST_F(EncoderTest, TestTwoClockwiseOneCC) {
-    uidx = 0;
+    updates_array_idx = 0;
     encoder_init();
     setAndRead(0, false);
     setAndRead(1, false);
@@ -97,7 +97,7 @@ TEST_F(EncoderTest, TestTwoClockwiseOneCC) {
     setAndRead(1, true);
     setAndRead(0, true);
 
-    EXPECT_EQ(uidx, 3);
+    EXPECT_EQ(updates_array_idx, 3);
     EXPECT_EQ(updates[0].index, 0);
     EXPECT_EQ(updates[0].clockwise, true);
     EXPECT_EQ(updates[1].index, 0);
@@ -107,38 +107,38 @@ TEST_F(EncoderTest, TestTwoClockwiseOneCC) {
 }
 
 TEST_F(EncoderTest, TestNoEarly) {
-    uidx = 0;
+    updates_array_idx = 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);
+    EXPECT_EQ(updates_array_idx, 0);
     // now send last pulse
     setAndRead(1, true);
-    EXPECT_EQ(uidx, 1);
+    EXPECT_EQ(updates_array_idx, 1);
     EXPECT_EQ(updates[0].index, 0);
     EXPECT_EQ(updates[0].clockwise, true);
 }
 
 TEST_F(EncoderTest, TestHalfway) {
-    uidx = 0;
+    updates_array_idx = 0;
     encoder_init();
     // go halfway
     setAndRead(0, false);
     setAndRead(1, false);
-    EXPECT_EQ(uidx, 0);
+    EXPECT_EQ(updates_array_idx, 0);
     // back off
     setAndRead(1, true);
     setAndRead(0, true);
-    EXPECT_EQ(uidx, 0);
+    EXPECT_EQ(updates_array_idx, 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_array_idx, 1);
     EXPECT_EQ(updates[0].index, 0);
     EXPECT_EQ(updates[0].clockwise, true);
 }
diff --git a/quantum/encoder/tests/encoder_tests_split_left_eq_right.cpp b/quantum/encoder/tests/encoder_tests_split_left_eq_right.cpp
new file mode 100644
index 0000000000..916e47b185
--- /dev/null
+++ b/quantum/encoder/tests/encoder_tests_split_left_eq_right.cpp
@@ -0,0 +1,135 @@
+/* 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_split.h"
+}
+
+struct update {
+    int8_t index;
+    bool   clockwise;
+};
+
+uint8_t updates_array_idx = 0;
+update  updates[32];
+
+bool isLeftHand;
+
+bool encoder_update_kb(uint8_t index, bool clockwise) {
+    if (!isLeftHand) {
+        // this method has no effect on slave half
+        printf("ignoring update on right hand (%d,%s)\n", index, clockwise ? "CW" : "CC");
+        return true;
+    }
+    updates[updates_array_idx % 32] = {index, clockwise};
+    updates_array_idx++;
+    return true;
+}
+
+bool setAndRead(pin_t pin, bool val) {
+    setPin(pin, val);
+    return encoder_read();
+}
+
+class EncoderSplitTestLeftEqRight : public ::testing::Test {
+   protected:
+    void SetUp() override {
+        updates_array_idx = 0;
+        for (int i = 0; i < 32; i++) {
+            pinIsInputHigh[i] = 0;
+            pins[i]           = 0;
+        }
+    }
+};
+
+TEST_F(EncoderSplitTestLeftEqRight, TestInitLeft) {
+    isLeftHand = true;
+    encoder_init();
+    EXPECT_EQ(pinIsInputHigh[0], true);
+    EXPECT_EQ(pinIsInputHigh[1], true);
+    EXPECT_EQ(pinIsInputHigh[2], true);
+    EXPECT_EQ(pinIsInputHigh[3], true);
+    EXPECT_EQ(pinIsInputHigh[4], false);
+    EXPECT_EQ(pinIsInputHigh[5], false);
+    EXPECT_EQ(pinIsInputHigh[6], false);
+    EXPECT_EQ(pinIsInputHigh[7], false);
+    EXPECT_EQ(updates_array_idx, 0); // no updates received
+}
+
+TEST_F(EncoderSplitTestLeftEqRight, TestInitRight) {
+    isLeftHand = false;
+    encoder_init();
+    EXPECT_EQ(pinIsInputHigh[0], false);
+    EXPECT_EQ(pinIsInputHigh[1], false);
+    EXPECT_EQ(pinIsInputHigh[2], false);
+    EXPECT_EQ(pinIsInputHigh[3], false);
+    EXPECT_EQ(pinIsInputHigh[4], true);
+    EXPECT_EQ(pinIsInputHigh[5], true);
+    EXPECT_EQ(pinIsInputHigh[6], true);
+    EXPECT_EQ(pinIsInputHigh[7], true);
+    EXPECT_EQ(updates_array_idx, 0); // no updates received
+}
+
+TEST_F(EncoderSplitTestLeftEqRight, TestOneClockwiseLeft) {
+    isLeftHand = true;
+    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(updates_array_idx, 1); // one update received
+    EXPECT_EQ(updates[0].index, 0);
+    EXPECT_EQ(updates[0].clockwise, true);
+}
+
+TEST_F(EncoderSplitTestLeftEqRight, TestOneClockwiseRightSent) {
+    isLeftHand = false;
+    encoder_init();
+    // send 4 pulses. with resolution 4, that's one step and we should get 1 update.
+    setAndRead(6, false);
+    setAndRead(7, false);
+    setAndRead(6, true);
+    setAndRead(7, true);
+
+    uint8_t slave_state[32] = {0};
+    encoder_state_raw(slave_state);
+
+    EXPECT_EQ(slave_state[0], 0);
+    EXPECT_EQ(slave_state[1], 0xFF);
+}
+
+TEST_F(EncoderSplitTestLeftEqRight, TestMultipleEncodersRightReceived) {
+    isLeftHand = true;
+    encoder_init();
+
+    uint8_t slave_state[32] = {1, 0xFF}; // First right encoder is CCW, Second right encoder CW
+    encoder_update_raw(slave_state);
+
+    EXPECT_EQ(updates_array_idx, 2); // two updates received, one for each changed item on the right side
+    EXPECT_EQ(updates[0].index, 2);
+    EXPECT_EQ(updates[0].clockwise, false);
+    EXPECT_EQ(updates[1].index, 3);
+    EXPECT_EQ(updates[1].clockwise, true);
+}
diff --git a/quantum/encoder/tests/encoder_tests_split_left_gt_right.cpp b/quantum/encoder/tests/encoder_tests_split_left_gt_right.cpp
new file mode 100644
index 0000000000..7b64bb2981
--- /dev/null
+++ b/quantum/encoder/tests/encoder_tests_split_left_gt_right.cpp
@@ -0,0 +1,139 @@
+/* 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_split.h"
+}
+
+struct update {
+    int8_t index;
+    bool   clockwise;
+};
+
+uint8_t updates_array_idx = 0;
+update  updates[32];
+
+bool isLeftHand;
+
+bool encoder_update_kb(uint8_t index, bool clockwise) {
+    if (!isLeftHand) {
+        // this method has no effect on slave half
+        printf("ignoring update on right hand (%d,%s)\n", index, clockwise ? "CW" : "CC");
+        return true;
+    }
+    updates[updates_array_idx % 32] = {index, clockwise};
+    updates_array_idx++;
+    return true;
+}
+
+bool setAndRead(pin_t pin, bool val) {
+    setPin(pin, val);
+    return encoder_read();
+}
+
+class EncoderSplitTestLeftGreaterThanRight : public ::testing::Test {
+   protected:
+    void SetUp() override {
+        updates_array_idx = 0;
+        for (int i = 0; i < 32; i++) {
+            pinIsInputHigh[i] = 0;
+            pins[i]           = 0;
+        }
+    }
+};
+
+TEST_F(EncoderSplitTestLeftGreaterThanRight, TestInitLeft) {
+    isLeftHand = true;
+    encoder_init();
+    EXPECT_EQ(pinIsInputHigh[0], true);
+    EXPECT_EQ(pinIsInputHigh[1], true);
+    EXPECT_EQ(pinIsInputHigh[2], true);
+    EXPECT_EQ(pinIsInputHigh[3], true);
+    EXPECT_EQ(pinIsInputHigh[4], true);
+    EXPECT_EQ(pinIsInputHigh[5], true);
+    EXPECT_EQ(pinIsInputHigh[6], false);
+    EXPECT_EQ(pinIsInputHigh[7], false);
+    EXPECT_EQ(pinIsInputHigh[8], false);
+    EXPECT_EQ(pinIsInputHigh[9], false);
+    EXPECT_EQ(updates_array_idx, 0); // no updates received
+}
+
+TEST_F(EncoderSplitTestLeftGreaterThanRight, TestInitRight) {
+    isLeftHand = false;
+    encoder_init();
+    EXPECT_EQ(pinIsInputHigh[0], false);
+    EXPECT_EQ(pinIsInputHigh[1], false);
+    EXPECT_EQ(pinIsInputHigh[2], false);
+    EXPECT_EQ(pinIsInputHigh[3], false);
+    EXPECT_EQ(pinIsInputHigh[4], false);
+    EXPECT_EQ(pinIsInputHigh[5], false);
+    EXPECT_EQ(pinIsInputHigh[6], true);
+    EXPECT_EQ(pinIsInputHigh[7], true);
+    EXPECT_EQ(pinIsInputHigh[8], true);
+    EXPECT_EQ(pinIsInputHigh[9], true);
+    EXPECT_EQ(updates_array_idx, 0); // no updates received
+}
+
+TEST_F(EncoderSplitTestLeftGreaterThanRight, TestOneClockwiseLeft) {
+    isLeftHand = true;
+    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(updates_array_idx, 1); // one update received
+    EXPECT_EQ(updates[0].index, 0);
+    EXPECT_EQ(updates[0].clockwise, true);
+}
+
+TEST_F(EncoderSplitTestLeftGreaterThanRight, TestOneClockwiseRightSent) {
+    isLeftHand = false;
+    encoder_init();
+    // send 4 pulses. with resolution 4, that's one step and we should get 1 update.
+    setAndRead(6, false);
+    setAndRead(7, false);
+    setAndRead(6, true);
+    setAndRead(7, true);
+
+    uint8_t slave_state[32] = {0};
+    encoder_state_raw(slave_state);
+
+    EXPECT_EQ(slave_state[0], 0xFF);
+    EXPECT_EQ(slave_state[1], 0);
+}
+
+TEST_F(EncoderSplitTestLeftGreaterThanRight, TestMultipleEncodersRightReceived) {
+    isLeftHand = true;
+    encoder_init();
+
+    uint8_t slave_state[32] = {1, 0xFF}; // First right encoder is CCW, Second right encoder no change, third right encoder CW
+    encoder_update_raw(slave_state);
+
+    EXPECT_EQ(updates_array_idx, 2); // two updates received, one for each changed item on the right side
+    EXPECT_EQ(updates[0].index, 3);
+    EXPECT_EQ(updates[0].clockwise, false);
+    EXPECT_EQ(updates[1].index, 4);
+    EXPECT_EQ(updates[1].clockwise, true);
+}
diff --git a/quantum/encoder/tests/encoder_tests_split_left_lt_right.cpp b/quantum/encoder/tests/encoder_tests_split_left_lt_right.cpp
new file mode 100644
index 0000000000..a6519c5762
--- /dev/null
+++ b/quantum/encoder/tests/encoder_tests_split_left_lt_right.cpp
@@ -0,0 +1,139 @@
+/* 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_split.h"
+}
+
+struct update {
+    int8_t index;
+    bool   clockwise;
+};
+
+uint8_t updates_array_idx = 0;
+update  updates[32];
+
+bool isLeftHand;
+
+bool encoder_update_kb(uint8_t index, bool clockwise) {
+    if (!isLeftHand) {
+        // this method has no effect on slave half
+        printf("ignoring update on right hand (%d,%s)\n", index, clockwise ? "CW" : "CC");
+        return true;
+    }
+    updates[updates_array_idx % 32] = {index, clockwise};
+    updates_array_idx++;
+    return true;
+}
+
+bool setAndRead(pin_t pin, bool val) {
+    setPin(pin, val);
+    return encoder_read();
+}
+
+class EncoderSplitTestLeftLessThanRight : public ::testing::Test {
+   protected:
+    void SetUp() override {
+        updates_array_idx = 0;
+        for (int i = 0; i < 32; i++) {
+            pinIsInputHigh[i] = 0;
+            pins[i]           = 0;
+        }
+    }
+};
+
+TEST_F(EncoderSplitTestLeftLessThanRight, TestInitLeft) {
+    isLeftHand = true;
+    encoder_init();
+    EXPECT_EQ(pinIsInputHigh[0], true);
+    EXPECT_EQ(pinIsInputHigh[1], true);
+    EXPECT_EQ(pinIsInputHigh[2], true);
+    EXPECT_EQ(pinIsInputHigh[3], true);
+    EXPECT_EQ(pinIsInputHigh[4], false);
+    EXPECT_EQ(pinIsInputHigh[5], false);
+    EXPECT_EQ(pinIsInputHigh[6], false);
+    EXPECT_EQ(pinIsInputHigh[7], false);
+    EXPECT_EQ(pinIsInputHigh[8], false);
+    EXPECT_EQ(pinIsInputHigh[9], false);
+    EXPECT_EQ(updates_array_idx, 0); // no updates received
+}
+
+TEST_F(EncoderSplitTestLeftLessThanRight, TestInitRight) {
+    isLeftHand = false;
+    encoder_init();
+    EXPECT_EQ(pinIsInputHigh[0], false);
+    EXPECT_EQ(pinIsInputHigh[1], false);
+    EXPECT_EQ(pinIsInputHigh[2], false);
+    EXPECT_EQ(pinIsInputHigh[3], false);
+    EXPECT_EQ(pinIsInputHigh[4], true);
+    EXPECT_EQ(pinIsInputHigh[5], true);
+    EXPECT_EQ(pinIsInputHigh[6], true);
+    EXPECT_EQ(pinIsInputHigh[7], true);
+    EXPECT_EQ(pinIsInputHigh[8], true);
+    EXPECT_EQ(pinIsInputHigh[9], true);
+    EXPECT_EQ(updates_array_idx, 0); // no updates received
+}
+
+TEST_F(EncoderSplitTestLeftLessThanRight, TestOneClockwiseLeft) {
+    isLeftHand = true;
+    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(updates_array_idx, 1); // one update received
+    EXPECT_EQ(updates[0].index, 0);
+    EXPECT_EQ(updates[0].clockwise, true);
+}
+
+TEST_F(EncoderSplitTestLeftLessThanRight, TestOneClockwiseRightSent) {
+    isLeftHand = false;
+    encoder_init();
+    // send 4 pulses. with resolution 4, that's one step and we should get 1 update.
+    setAndRead(6, false);
+    setAndRead(7, false);
+    setAndRead(6, true);
+    setAndRead(7, true);
+
+    uint8_t slave_state[32] = {0};
+    encoder_state_raw(slave_state);
+
+    EXPECT_EQ(slave_state[0], 0);
+    EXPECT_EQ(slave_state[1], 0xFF);
+}
+
+TEST_F(EncoderSplitTestLeftLessThanRight, TestMultipleEncodersRightReceived) {
+    isLeftHand = true;
+    encoder_init();
+
+    uint8_t slave_state[32] = {1, 0, 0xFF}; // First right encoder is CCW, Second right encoder no change, third right encoder CW
+    encoder_update_raw(slave_state);
+
+    EXPECT_EQ(updates_array_idx, 2); // two updates received, one for each changed item on the right side
+    EXPECT_EQ(updates[0].index, 2);
+    EXPECT_EQ(updates[0].clockwise, false);
+    EXPECT_EQ(updates[1].index, 4);
+    EXPECT_EQ(updates[1].clockwise, true);
+}
diff --git a/quantum/encoder/tests/encoder_tests_split.cpp b/quantum/encoder/tests/encoder_tests_split_no_left.cpp
index 25e52c83f9..b6b2d7e2d1 100644
--- a/quantum/encoder/tests/encoder_tests_split.cpp
+++ b/quantum/encoder/tests/encoder_tests_split_no_left.cpp
@@ -30,7 +30,7 @@ struct update {
     bool   clockwise;
 };
 
-uint8_t uidx = 0;
+uint8_t updates_array_idx = 0;
 update  updates[32];
 
 bool isLeftHand;
@@ -41,8 +41,8 @@ bool encoder_update_kb(uint8_t index, bool clockwise) {
         printf("ignoring update on right hand (%d,%s)\n", index, clockwise ? "CW" : "CC");
         return true;
     }
-    updates[uidx % 32] = {index, clockwise};
-    uidx++;
+    updates[updates_array_idx % 32] = {index, clockwise};
+    updates_array_idx++;
     return true;
 }
 
@@ -51,10 +51,10 @@ bool setAndRead(pin_t pin, bool val) {
     return encoder_read();
 }
 
-class EncoderTest : public ::testing::Test {
+class EncoderSplitTestNoLeft : public ::testing::Test {
    protected:
     void SetUp() override {
-        uidx = 0;
+        updates_array_idx = 0;
         for (int i = 0; i < 32; i++) {
             pinIsInputHigh[i] = 0;
             pins[i]           = 0;
@@ -62,27 +62,27 @@ class EncoderTest : public ::testing::Test {
     }
 };
 
-TEST_F(EncoderTest, TestInitLeft) {
+TEST_F(EncoderSplitTestNoLeft, TestInitLeft) {
     isLeftHand = true;
     encoder_init();
-    EXPECT_EQ(pinIsInputHigh[0], true);
-    EXPECT_EQ(pinIsInputHigh[1], true);
+    EXPECT_EQ(pinIsInputHigh[0], false);
+    EXPECT_EQ(pinIsInputHigh[1], false);
     EXPECT_EQ(pinIsInputHigh[2], false);
     EXPECT_EQ(pinIsInputHigh[3], false);
-    EXPECT_EQ(uidx, 0);
+    EXPECT_EQ(updates_array_idx, 0); // no updates received
 }
 
-TEST_F(EncoderTest, TestInitRight) {
+TEST_F(EncoderSplitTestNoLeft, TestInitRight) {
     isLeftHand = false;
     encoder_init();
-    EXPECT_EQ(pinIsInputHigh[0], false);
-    EXPECT_EQ(pinIsInputHigh[1], false);
+    EXPECT_EQ(pinIsInputHigh[0], true);
+    EXPECT_EQ(pinIsInputHigh[1], true);
     EXPECT_EQ(pinIsInputHigh[2], true);
     EXPECT_EQ(pinIsInputHigh[3], true);
-    EXPECT_EQ(uidx, 0);
+    EXPECT_EQ(updates_array_idx, 0); // no updates received
 }
 
-TEST_F(EncoderTest, TestOneClockwiseLeft) {
+TEST_F(EncoderSplitTestNoLeft, TestOneClockwiseLeft) {
     isLeftHand = true;
     encoder_init();
     // send 4 pulses. with resolution 4, that's one step and we should get 1 update.
@@ -91,12 +91,10 @@ TEST_F(EncoderTest, TestOneClockwiseLeft) {
     setAndRead(0, true);
     setAndRead(1, true);
 
-    EXPECT_EQ(uidx, 1);
-    EXPECT_EQ(updates[0].index, 0);
-    EXPECT_EQ(updates[0].clockwise, true);
+    EXPECT_EQ(updates_array_idx, 0); // no updates received
 }
 
-TEST_F(EncoderTest, TestOneClockwiseRightSent) {
+TEST_F(EncoderSplitTestNoLeft, TestOneClockwiseRightSent) {
     isLeftHand = false;
     encoder_init();
     // send 4 pulses. with resolution 4, that's one step and we should get 1 update.
@@ -105,39 +103,23 @@ TEST_F(EncoderTest, TestOneClockwiseRightSent) {
     setAndRead(2, true);
     setAndRead(3, true);
 
-    uint8_t slave_state[2] = {0};
+    uint8_t slave_state[32] = {0};
     encoder_state_raw(slave_state);
 
-    EXPECT_EQ((int8_t)slave_state[0], -1);
+    EXPECT_EQ(slave_state[0], 0);
+    EXPECT_EQ(slave_state[1], 0xFF);
 }
 
-/* this test will not work after the previous test.
- * this is due to encoder_value[1] already being set to -1 when simulating the right half.
- * When we now receive this update acting as the left half, there is no change.
- * This is hard to mock, as the static values inside encoder.c normally exist twice, once on each half,
- * but here, they only exist once.
- */
-
-// TEST_F(EncoderTest, TestOneClockwiseRightReceived) {
-//     isLeftHand = true;
-//     encoder_init();
-
-//     uint8_t slave_state[2] = {255, 0};
-//     encoder_update_raw(slave_state);
-
-//     EXPECT_EQ(uidx, 1);
-//     EXPECT_EQ(updates[0].index, 1);
-//     EXPECT_EQ(updates[0].clockwise, true);
-// }
-
-TEST_F(EncoderTest, TestOneCounterClockwiseRightReceived) {
+TEST_F(EncoderSplitTestNoLeft, TestMultipleEncodersRightReceived) {
     isLeftHand = true;
     encoder_init();
 
-    uint8_t slave_state[2] = {0, 0};
+    uint8_t slave_state[32] = {1, 0xFF}; // First right encoder is CCW, Second right encoder no change, third right encoder CW
     encoder_update_raw(slave_state);
 
-    EXPECT_EQ(uidx, 1);
-    EXPECT_EQ(updates[0].index, 1);
+    EXPECT_EQ(updates_array_idx, 2); // two updates received, one for each changed item on the right side
+    EXPECT_EQ(updates[0].index, 0);
     EXPECT_EQ(updates[0].clockwise, false);
+    EXPECT_EQ(updates[1].index, 1);
+    EXPECT_EQ(updates[1].clockwise, true);
 }
diff --git a/quantum/encoder/tests/encoder_tests_split_no_right.cpp b/quantum/encoder/tests/encoder_tests_split_no_right.cpp
new file mode 100644
index 0000000000..fa0a7c18a8
--- /dev/null
+++ b/quantum/encoder/tests/encoder_tests_split_no_right.cpp
@@ -0,0 +1,118 @@
+/* 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_split.h"
+}
+
+struct update {
+    int8_t index;
+    bool   clockwise;
+};
+
+uint8_t updates_array_idx = 0;
+update  updates[32];
+
+bool isLeftHand;
+
+bool encoder_update_kb(uint8_t index, bool clockwise) {
+    if (!isLeftHand) {
+        // this method has no effect on slave half
+        printf("ignoring update on right hand (%d,%s)\n", index, clockwise ? "CW" : "CC");
+        return true;
+    }
+    updates[updates_array_idx % 32] = {index, clockwise};
+    updates_array_idx++;
+    return true;
+}
+
+bool setAndRead(pin_t pin, bool val) {
+    setPin(pin, val);
+    return encoder_read();
+}
+
+class EncoderSplitTestNoRight : public ::testing::Test {
+   protected:
+    void SetUp() override {
+        updates_array_idx = 0;
+        for (int i = 0; i < 32; i++) {
+            pinIsInputHigh[i] = 0;
+            pins[i]           = 0;
+        }
+    }
+};
+
+TEST_F(EncoderSplitTestNoRight, TestInitLeft) {
+    isLeftHand = true;
+    encoder_init();
+    EXPECT_EQ(pinIsInputHigh[0], true);
+    EXPECT_EQ(pinIsInputHigh[1], true);
+    EXPECT_EQ(pinIsInputHigh[2], true);
+    EXPECT_EQ(pinIsInputHigh[3], true);
+    EXPECT_EQ(updates_array_idx, 0); // no updates received
+}
+
+TEST_F(EncoderSplitTestNoRight, TestInitRight) {
+    isLeftHand = false;
+    encoder_init();
+    EXPECT_EQ(pinIsInputHigh[0], false);
+    EXPECT_EQ(pinIsInputHigh[1], false);
+    EXPECT_EQ(pinIsInputHigh[2], false);
+    EXPECT_EQ(pinIsInputHigh[3], false);
+    EXPECT_EQ(updates_array_idx, 0); // no updates received
+}
+
+TEST_F(EncoderSplitTestNoRight, TestOneClockwiseLeft) {
+    isLeftHand = true;
+    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(updates_array_idx, 1); // one updates received
+    EXPECT_EQ(updates[0].index, 0);
+    EXPECT_EQ(updates[0].clockwise, true);
+}
+
+TEST_F(EncoderSplitTestNoRight, TestOneClockwiseRightSent) {
+    isLeftHand = false;
+    encoder_init();
+
+    uint8_t slave_state[32] = {0xAA, 0xAA};
+    encoder_state_raw(slave_state);
+
+    EXPECT_EQ(slave_state[0], 0xAA);
+    EXPECT_EQ(slave_state[1], 0xAA);
+}
+
+TEST_F(EncoderSplitTestNoRight, TestMultipleEncodersRightReceived) {
+    isLeftHand = true;
+    encoder_init();
+
+    uint8_t slave_state[32] = {1, 0xFF}; // These values would trigger updates if there were encoders on the other side
+    encoder_update_raw(slave_state);
+
+    EXPECT_EQ(updates_array_idx, 0); // no updates received -- no right-hand encoders
+}
diff --git a/quantum/encoder/tests/mock.h b/quantum/encoder/tests/mock.h
index dbc25a0846..80c336b5ef 100644
--- a/quantum/encoder/tests/mock.h
+++ b/quantum/encoder/tests/mock.h
@@ -19,12 +19,6 @@
 #include <stdint.h>
 #include <stdbool.h>
 
-/* Here, "pins" from 0 to 31 are allowed. */
-#define ENCODERS_PAD_A \
-    { 0 }
-#define ENCODERS_PAD_B \
-    { 1 }
-
 typedef uint8_t pin_t;
 
 extern bool pins[];
diff --git a/quantum/encoder/tests/mock_split.h b/quantum/encoder/tests/mock_split.h
index 0ae62652f9..2fc12f1830 100644
--- a/quantum/encoder/tests/mock_split.h
+++ b/quantum/encoder/tests/mock_split.h
@@ -20,20 +20,10 @@
 #include <stdbool.h>
 
 #define SPLIT_KEYBOARD
-/* Here, "pins" from 0 to 31 are allowed. */
-#define ENCODERS_PAD_A \
-    { 0 }
-#define ENCODERS_PAD_B \
-    { 1 }
-#define ENCODERS_PAD_A_RIGHT \
-    { 2 }
-#define ENCODERS_PAD_B_RIGHT \
-    { 3 }
-
 typedef uint8_t pin_t;
-extern bool     isLeftHand;
-void            encoder_state_raw(uint8_t* slave_state);
-void            encoder_update_raw(uint8_t* slave_state);
+
+void encoder_state_raw(uint8_t* slave_state);
+void encoder_update_raw(uint8_t* slave_state);
 
 extern bool pins[];
 extern bool pinIsInputHigh[];
diff --git a/quantum/encoder/tests/rules.mk b/quantum/encoder/tests/rules.mk
index b826ce3aed..6a2611952c 100644
--- a/quantum/encoder/tests/rules.mk
+++ b/quantum/encoder/tests/rules.mk
@@ -1,13 +1,58 @@
-encoder_DEFS := -DENCODER_MOCK_SINGLE
+encoder_DEFS := -DENCODER_TESTS -DENCODER_ENABLE -DENCODER_MOCK_SINGLE
+encoder_CONFIG := $(QUANTUM_PATH)/encoder/tests/config_mock.h
 
 encoder_SRC := \
+	platforms/test/timer.c \
 	$(QUANTUM_PATH)/encoder/tests/mock.c \
 	$(QUANTUM_PATH)/encoder/tests/encoder_tests.cpp \
 	$(QUANTUM_PATH)/encoder.c
 
-encoder_split_DEFS := -DENCODER_MOCK_SPLIT
+encoder_split_left_eq_right_DEFS := -DENCODER_TESTS -DENCODER_ENABLE -DENCODER_MOCK_SPLIT
+encoder_split_left_eq_right_INC := $(QUANTUM_PATH)/split_common
+encoder_split_left_eq_right_CONFIG := $(QUANTUM_PATH)/encoder/tests/config_mock_split_left_eq_right.h
 
-encoder_split_SRC := \
+encoder_split_left_eq_right_SRC := \
+	platforms/test/timer.c \
 	$(QUANTUM_PATH)/encoder/tests/mock_split.c \
-	$(QUANTUM_PATH)/encoder/tests/encoder_tests_split.cpp \
+	$(QUANTUM_PATH)/encoder/tests/encoder_tests_split_left_eq_right.cpp \
+	$(QUANTUM_PATH)/encoder.c
+
+encoder_split_left_gt_right_DEFS := -DENCODER_TESTS -DENCODER_ENABLE -DENCODER_MOCK_SPLIT
+encoder_split_left_gt_right_INC := $(QUANTUM_PATH)/split_common
+encoder_split_left_gt_right_CONFIG := $(QUANTUM_PATH)/encoder/tests/config_mock_split_left_gt_right.h
+
+encoder_split_left_gt_right_SRC := \
+	platforms/test/timer.c \
+	$(QUANTUM_PATH)/encoder/tests/mock_split.c \
+	$(QUANTUM_PATH)/encoder/tests/encoder_tests_split_left_gt_right.cpp \
+	$(QUANTUM_PATH)/encoder.c
+
+encoder_split_left_lt_right_DEFS := -DENCODER_TESTS -DENCODER_ENABLE -DENCODER_MOCK_SPLIT
+encoder_split_left_lt_right_INC := $(QUANTUM_PATH)/split_common
+encoder_split_left_lt_right_CONFIG := $(QUANTUM_PATH)/encoder/tests/config_mock_split_left_lt_right.h
+
+encoder_split_left_lt_right_SRC := \
+	platforms/test/timer.c \
+	$(QUANTUM_PATH)/encoder/tests/mock_split.c \
+	$(QUANTUM_PATH)/encoder/tests/encoder_tests_split_left_lt_right.cpp \
+	$(QUANTUM_PATH)/encoder.c
+
+encoder_split_no_left_DEFS := -DENCODER_TESTS -DENCODER_ENABLE -DENCODER_MOCK_SPLIT
+encoder_split_no_left_INC := $(QUANTUM_PATH)/split_common
+encoder_split_no_left_CONFIG := $(QUANTUM_PATH)/encoder/tests/config_mock_split_no_left.h
+
+encoder_split_no_left_SRC := \
+	platforms/test/timer.c \
+	$(QUANTUM_PATH)/encoder/tests/mock_split.c \
+	$(QUANTUM_PATH)/encoder/tests/encoder_tests_split_no_left.cpp \
+	$(QUANTUM_PATH)/encoder.c
+
+encoder_split_no_right_DEFS := -DENCODER_TESTS -DENCODER_ENABLE -DENCODER_MOCK_SPLIT
+encoder_split_no_right_INC := $(QUANTUM_PATH)/split_common
+encoder_split_no_right_CONFIG := $(QUANTUM_PATH)/encoder/tests/config_mock_split_no_right.h
+
+encoder_split_no_right_SRC := \
+	platforms/test/timer.c \
+	$(QUANTUM_PATH)/encoder/tests/mock_split.c \
+	$(QUANTUM_PATH)/encoder/tests/encoder_tests_split_no_right.cpp \
 	$(QUANTUM_PATH)/encoder.c
diff --git a/quantum/encoder/tests/testlist.mk b/quantum/encoder/tests/testlist.mk
index 1be9f4a054..6b2fd84d96 100644
--- a/quantum/encoder/tests/testlist.mk
+++ b/quantum/encoder/tests/testlist.mk
@@ -1,3 +1,7 @@
 TEST_LIST += \
 	encoder \
-	encoder_split
+	encoder_split_left_eq_right \
+	encoder_split_left_gt_right \
+	encoder_split_left_lt_right \
+	encoder_split_no_left \
+	encoder_split_no_right