3 files changed, 170 insertions, 0 deletions
diff --git a/quantum/os_detection/tests/os_detection.cpp b/quantum/os_detection/tests/os_detection.cpp
new file mode 100644
index 0000000000..102349852e
--- /dev/null
+++ b/quantum/os_detection/tests/os_detection.cpp
@@ -0,0 +1,164 @@
+/* Copyright 2022 Ruslan Sayfutdinov (@KapJI)
+ *
+ * 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"
+
+extern "C" {
+#include "os_detection.h"
+}
+
+class OsDetectionTest : public ::testing::Test {
+   protected:
+    void SetUp() override {
+        erase_wlength_data();
+    }
+};
+
+os_variant_t check_sequence(const std::vector<uint16_t> &w_lengths) {
+    for (auto &w_length : w_lengths) {
+        process_wlength(w_length);
+    }
+    return detected_host_os();
+}
+
+/* Some collected data.
+
+ChibiOS:
+Windows 10: [FF, FF, 4, 24, 4, 24, 4, FF, 24, FF, 4, FF, 24, 4, 24, 20A, 20A, 20A, 20A, 20A, 20A, 20A, 20A, 20A, 20A, 20A, 20A, 20A, 20A, 20A, 20A, 20A, 20A, 20A, 20A, 20A, 20A, 20A, 20A]
+Windows 10 (another host): [FF, FF, 4, 24, 4, 24, 4, 24, 4, 24, 4, 24]
+macOS 12.5: [2, 24, 2, 28, FF]
+iOS/iPadOS 15.6: [2, 24, 2, 28]
+Linux (including Android, Raspberry Pi and WebOS TV): [FF, FF, FF]
+PS5: [2, 4, 2, 28, 2, 24]
+Nintendo Switch: [82, FF, 40, 40, FF, 40, 40, FF, 40, 40, FF, 40, 40, FF, 40, 40]
+Quest 2: [FF, FF, FF, FE, FF, FE, FF, FE, FF, FE, FF]
+
+LUFA:
+Windows 10 (first connect): [12, FF, FF, 4, 10, FF, FF, FF, 4, 10, 20A, 20A, 20A, 20A, 20A, 20A]
+Windows 10 (subsequent connect): [FF, FF, 4, 10, FF, 4, FF, 10, FF, 20A, 20A, 20A, 20A, 20A, 20A]
+Windows 10 (another host): [FF, FF, 4, 10, 4, 10]
+macOS: [2, 10, 2, E, FF]
+iOS/iPadOS: [2, 10, 2, E]
+Linux: [FF, FF, FF]
+PS5: [2, 4, 2, E, 2, 10]
+Nintendo Switch: [82, FF, 40, 40, FF, 40, 40]
+
+V-USB:
+Windows 10: [FF, FF, 4, E, FF]
+Windows 10 (another host): [FF, FF, 4, E, 4]
+macOS: [2, E, 2, E, FF]
+iOS/iPadOS: [2, E, 2, E]
+Linux: [FF, FF, FF]
+PS5: [2, 4, 2, E, 2]
+Nintendo Switch: [82, FF, 40, 40]
+Quest 2: [FF, FF, FF, FE]
+
+Common parts:
+Windows: [..., FF, FF, 4, ...]
+macOS: [2, _, 2, _, FF]
+iOS/iPadOS: [2, _, 2, _]
+Linux: [FF, FF, FF]
+PS5: [2, 4, 2, _, 2, ...]
+Nintendo Switch: [82, FF, 40, 40, ...]
+Quest 2: [FF, FF, FF, FE, ...]
+*/
+TEST_F(OsDetectionTest, TestLinux) {
+    EXPECT_EQ(check_sequence({0xFF, 0xFF, 0xFF}), OS_LINUX);
+}
+
+TEST_F(OsDetectionTest, TestChibiosMacos) {
+    EXPECT_EQ(check_sequence({0x2, 0x24, 0x2, 0x28, 0xFF}), OS_MACOS);
+}
+
+TEST_F(OsDetectionTest, TestLufaMacos) {
+    EXPECT_EQ(check_sequence({0x2, 0x10, 0x2, 0xE, 0xFF}), OS_MACOS);
+}
+
+TEST_F(OsDetectionTest, TestVusbMacos) {
+    EXPECT_EQ(check_sequence({0x2, 0xE, 0x2, 0xE, 0xFF}), OS_MACOS);
+}
+
+TEST_F(OsDetectionTest, TestChibiosIos) {
+    EXPECT_EQ(check_sequence({0x2, 0x24, 0x2, 0x28}), OS_IOS);
+}
+
+TEST_F(OsDetectionTest, TestLufaIos) {
+    EXPECT_EQ(check_sequence({0x2, 0x10, 0x2, 0xE}), OS_IOS);
+}
+
+TEST_F(OsDetectionTest, TestVusbIos) {
+    EXPECT_EQ(check_sequence({0x2, 0xE, 0x2, 0xE}), OS_IOS);
+}
+
+TEST_F(OsDetectionTest, TestChibiosWindows10) {
+    EXPECT_EQ(check_sequence({0xFF, 0xFF, 0x4, 0x24, 0x4, 0x24, 0x4, 0xFF, 0x24, 0xFF, 0x4, 0xFF, 0x24, 0x4, 0x24, 0x20A, 0x20A, 0x20A, 0x20A, 0x20A, 0x20A, 0x20A, 0x20A, 0x20A, 0x20A, 0x20A, 0x20A, 0x20A, 0x20A, 0x20A, 0x20A, 0x20A, 0x20A, 0x20A, 0x20A, 0x20A, 0x20A, 0x20A, 0x20A}), OS_WINDOWS);
+}
+
+TEST_F(OsDetectionTest, TestChibiosWindows10_2) {
+    EXPECT_EQ(check_sequence({0xFF, 0xFF, 0x4, 0x24, 0x4, 0x24, 0x4, 0x24, 0x4, 0x24, 0x4, 0x24}), OS_WINDOWS);
+}
+
+TEST_F(OsDetectionTest, TestLufaWindows10) {
+    EXPECT_EQ(check_sequence({0x12, 0xFF, 0xFF, 0x4, 0x10, 0xFF, 0xFF, 0xFF, 0x4, 0x10, 0x20A, 0x20A, 0x20A, 0x20A, 0x20A, 0x20A}), OS_WINDOWS);
+}
+
+TEST_F(OsDetectionTest, TestLufaWindows10_2) {
+    EXPECT_EQ(check_sequence({0xFF, 0xFF, 0x4, 0x10, 0xFF, 0x4, 0xFF, 0x10, 0xFF, 0x20A, 0x20A, 0x20A, 0x20A, 0x20A, 0x20A}), OS_WINDOWS);
+}
+
+TEST_F(OsDetectionTest, TestLufaWindows10_3) {
+    EXPECT_EQ(check_sequence({0xFF, 0xFF, 0x4, 0x10, 0x4, 0x10}), OS_WINDOWS);
+}
+
+TEST_F(OsDetectionTest, TestVusbWindows10) {
+    EXPECT_EQ(check_sequence({0xFF, 0xFF, 0x4, 0xE, 0xFF}), OS_WINDOWS);
+}
+
+TEST_F(OsDetectionTest, TestVusbWindows10_2) {
+    EXPECT_EQ(check_sequence({0xFF, 0xFF, 0x4, 0xE, 0x4}), OS_WINDOWS);
+}
+
+TEST_F(OsDetectionTest, TestChibiosPs5) {
+    EXPECT_EQ(check_sequence({0x2, 0x4, 0x2, 0x28, 0x2, 0x24}), OS_LINUX);
+}
+
+TEST_F(OsDetectionTest, TestLufaPs5) {
+    EXPECT_EQ(check_sequence({0x2, 0x4, 0x2, 0xE, 0x2, 0x10}), OS_LINUX);
+}
+
+TEST_F(OsDetectionTest, TestVusbPs5) {
+    EXPECT_EQ(check_sequence({0x2, 0x4, 0x2, 0xE, 0x2}), OS_LINUX);
+}
+
+TEST_F(OsDetectionTest, TestChibiosNintendoSwitch) {
+    EXPECT_EQ(check_sequence({0x82, 0xFF, 0x40, 0x40, 0xFF, 0x40, 0x40, 0xFF, 0x40, 0x40, 0xFF, 0x40, 0x40, 0xFF, 0x40, 0x40}), OS_LINUX);
+}
+
+TEST_F(OsDetectionTest, TestLufaNintendoSwitch) {
+    EXPECT_EQ(check_sequence({0x82, 0xFF, 0x40, 0x40, 0xFF, 0x40, 0x40}), OS_LINUX);
+}
+
+TEST_F(OsDetectionTest, TestVusbNintendoSwitch) {
+    EXPECT_EQ(check_sequence({0x82, 0xFF, 0x40, 0x40}), OS_LINUX);
+}
+
+TEST_F(OsDetectionTest, TestChibiosQuest2) {
+    EXPECT_EQ(check_sequence({0xFF, 0xFF, 0xFF, 0xFE, 0xFF, 0xFE, 0xFF, 0xFE, 0xFF, 0xFE, 0xFF}), OS_LINUX);
+}
+
+TEST_F(OsDetectionTest, TestVusbQuest2) {
+    EXPECT_EQ(check_sequence({0xFF, 0xFF, 0xFF, 0xFE}), OS_LINUX);
+}
diff --git a/quantum/os_detection/tests/rules.mk b/quantum/os_detection/tests/rules.mk
new file mode 100644
index 0000000000..9bfe373f46
--- /dev/null
+++ b/quantum/os_detection/tests/rules.mk
@@ -0,0 +1,5 @@
+os_detection_DEFS := -DOS_DETECTION_ENABLE
+
+os_detection_SRC := \
+    $(QUANTUM_PATH)/os_detection/tests/os_detection.cpp \
+    $(QUANTUM_PATH)/os_detection.c
diff --git a/quantum/os_detection/tests/testlist.mk b/quantum/os_detection/tests/testlist.mk
new file mode 100644
index 0000000000..405a7b82d5
--- /dev/null
+++ b/quantum/os_detection/tests/testlist.mk
@@ -0,0 +1 @@
+TEST_LIST += os_detection