4 files changed, 119 insertions, 0 deletions
diff --git a/tests/test_common/keycode_table.cpp b/tests/test_common/keycode_table.cpp
index ab9c292e95..337bc8fb5f 100644
--- a/tests/test_common/keycode_table.cpp
+++ b/tests/test_common/keycode_table.cpp
@@ -659,5 +659,7 @@ std::map<uint16_t, std::string> KEYCODE_ID_TABLE = {
     {QK_AUTOCORRECT_ON, "QK_AUTOCORRECT_ON"},
     {QK_AUTOCORRECT_OFF, "QK_AUTOCORRECT_OFF"},
     {QK_AUTOCORRECT_TOGGLE, "QK_AUTOCORRECT_TOGGLE"},
+    {QK_TRI_LAYER_LOWER, "QK_TRI_LAYER_LOWER"},
+    {QK_TRI_LAYER_UPPER, "QK_TRI_LAYER_UPPER"},
     {SAFE_RANGE, "SAFE_RANGE"},
 };
diff --git a/tests/tri_layer/config.h b/tests/tri_layer/config.h
new file mode 100644
index 0000000000..b68bf0c2d5
--- /dev/null
+++ b/tests/tri_layer/config.h
@@ -0,0 +1,6 @@
+// Copyright 2021 Christopher Courtney, aka Drashna Jael're  (@drashna) <drashna@live.com>
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include "test_common.h"
diff --git a/tests/tri_layer/test.mk b/tests/tri_layer/test.mk
new file mode 100644
index 0000000000..50548c3e1c
--- /dev/null
+++ b/tests/tri_layer/test.mk
@@ -0,0 +1,8 @@
+# Copyright 2021 Christopher Courtney, aka Drashna Jael're  (@drashna) <drashna@live.com>
+# SPDX-License-Identifier: GPL-2.0-or-later
+
+# --------------------------------------------------------------------------------
+# Keep this file, even if it is empty, as a marker that this folder contains tests
+# --------------------------------------------------------------------------------
+
+TRI_LAYER_ENABLE = yes
diff --git a/tests/tri_layer/test_tri_layer.cpp b/tests/tri_layer/test_tri_layer.cpp
new file mode 100644
index 0000000000..fffc124f4c
--- /dev/null
+++ b/tests/tri_layer/test_tri_layer.cpp
@@ -0,0 +1,103 @@
+// Copyright 2021 Christopher Courtney, aka Drashna Jael're  (@drashna) <drashna@live.com>
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "test_common.hpp"
+
+using testing::_;
+using testing::InSequence;
+
+class TriLayer : public TestFixture {};
+
+TEST_F(TriLayer, TriLayerLowerTest) {
+    TestDriver driver;
+    KeymapKey  lower_layer_key = KeymapKey{0, 0, 0, QK_TRI_LAYER_LOWER};
+
+    set_keymap({lower_layer_key, KeymapKey{1, 0, 0, KC_TRNS}});
+
+    /* Press Lower. */
+    EXPECT_NO_REPORT(driver);
+    lower_layer_key.press();
+    run_one_scan_loop();
+    EXPECT_TRUE(layer_state_is(get_tri_layer_lower_layer()));
+    EXPECT_FALSE(layer_state_is(get_tri_layer_upper_layer()));
+    EXPECT_FALSE(layer_state_is(get_tri_layer_adjust_layer()));
+    VERIFY_AND_CLEAR(driver);
+
+    /* Release Lower. */
+    EXPECT_NO_REPORT(driver);
+    lower_layer_key.release();
+    run_one_scan_loop();
+    EXPECT_FALSE(layer_state_is(get_tri_layer_lower_layer()));
+    EXPECT_FALSE(layer_state_is(get_tri_layer_upper_layer()));
+    EXPECT_FALSE(layer_state_is(get_tri_layer_adjust_layer()));
+    VERIFY_AND_CLEAR(driver);
+}
+
+TEST_F(TriLayer, TriLayerUpperTest) {
+    TestDriver driver;
+    KeymapKey  upper_layer_key = KeymapKey{0, 0, 0, QK_TRI_LAYER_UPPER};
+
+    set_keymap({upper_layer_key, KeymapKey{2, 0, 0, KC_TRNS}});
+
+    /* Press Raise. */
+    EXPECT_NO_REPORT(driver);
+    upper_layer_key.press();
+    run_one_scan_loop();
+    EXPECT_FALSE(layer_state_is(get_tri_layer_lower_layer()));
+    EXPECT_TRUE(layer_state_is(get_tri_layer_upper_layer()));
+    EXPECT_FALSE(layer_state_is(get_tri_layer_adjust_layer()));
+    VERIFY_AND_CLEAR(driver);
+
+    /* Release Raise. */
+    EXPECT_NO_REPORT(driver);
+    upper_layer_key.release();
+    run_one_scan_loop();
+    EXPECT_FALSE(layer_state_is(get_tri_layer_lower_layer()));
+    EXPECT_FALSE(layer_state_is(get_tri_layer_upper_layer()));
+    EXPECT_FALSE(layer_state_is(get_tri_layer_adjust_layer()));
+    VERIFY_AND_CLEAR(driver);
+}
+
+TEST_F(TriLayer, TriLayerAdjustTest) {
+    TestDriver driver;
+    KeymapKey  lower_layer_key = KeymapKey{0, 0, 0, QK_TRI_LAYER_LOWER};
+    KeymapKey  upper_layer_key = KeymapKey{0, 1, 0, QK_TRI_LAYER_UPPER};
+
+    set_keymap({
+        upper_layer_key,
+        lower_layer_key,
+        KeymapKey{1, 0, 0, KC_TRNS},
+        KeymapKey{1, 1, 0, KC_TRNS},
+        KeymapKey{2, 0, 0, KC_TRNS},
+        KeymapKey{2, 1, 0, KC_TRNS},
+        KeymapKey{3, 0, 0, KC_TRNS},
+        KeymapKey{3, 1, 0, KC_TRNS},
+    });
+
+    /* Press Lower, then upper, and release upper and then lower. */
+    EXPECT_NO_REPORT(driver);
+    lower_layer_key.press();
+    run_one_scan_loop();
+    EXPECT_TRUE(layer_state_is(get_tri_layer_lower_layer()));
+    EXPECT_FALSE(layer_state_is(get_tri_layer_upper_layer()));
+    EXPECT_FALSE(layer_state_is(get_tri_layer_adjust_layer()));
+
+    upper_layer_key.press();
+    run_one_scan_loop();
+    EXPECT_TRUE(layer_state_is(get_tri_layer_lower_layer()));
+    EXPECT_TRUE(layer_state_is(get_tri_layer_upper_layer()));
+    EXPECT_TRUE(layer_state_is(get_tri_layer_adjust_layer()));
+
+    lower_layer_key.release();
+    run_one_scan_loop();
+    EXPECT_FALSE(layer_state_is(get_tri_layer_lower_layer()));
+    EXPECT_TRUE(layer_state_is(get_tri_layer_upper_layer()));
+    EXPECT_FALSE(layer_state_is(get_tri_layer_adjust_layer()));
+
+    upper_layer_key.release();
+    run_one_scan_loop();
+    EXPECT_FALSE(layer_state_is(get_tri_layer_lower_layer()));
+    EXPECT_FALSE(layer_state_is(get_tri_layer_upper_layer()));
+    EXPECT_FALSE(layer_state_is(get_tri_layer_adjust_layer()));
+    VERIFY_AND_CLEAR(driver);
+}