fix(linux): enable lowlatency mode for AMD (#3088)

tests/unit/platform/test_common.cpp

@@ -0,0 +1,49 @@
+/**
+ * @file tests/unit/platform/test_common.cpp
+ * @brief Test src/platform/common.*.
+ */
+#include <src/platform/common.h>
+
+#include "../../tests_common.h"
+
+struct SetEnvTest: ::testing::TestWithParam<std::tuple<std::string, std::string, int>> {
+protected:
+  void
+  TearDown() override {
+    // Clean up environment variable after each test
+    const auto &[name, value, expected] = GetParam();
+    platf::unset_env(name);
+  }
+};
+
+TEST_P(SetEnvTest, SetEnvironmentVariableTests) {
+  const auto &[name, value, expected] = GetParam();
+  platf::set_env(name, value);
+
+  const char *env_value = std::getenv(name.c_str());
+  if (expected == 0 && !value.empty()) {
+    ASSERT_NE(env_value, nullptr);
+    ASSERT_EQ(std::string(env_value), value);
+  }
+  else {
+    ASSERT_EQ(env_value, nullptr);
+  }
+}
+
+TEST_P(SetEnvTest, UnsetEnvironmentVariableTests) {
+  const auto &[name, value, expected] = GetParam();
+  platf::unset_env(name);
+
+  const char *env_value = std::getenv(name.c_str());
+  if (expected == 0) {
+    ASSERT_EQ(env_value, nullptr);
+  }
+}
+
+INSTANTIATE_TEST_SUITE_P(
+  SetEnvTests,
+  SetEnvTest,
+  ::testing::Values(
+    std::make_tuple("SUNSHINE_UNIT_TEST_ENV_VAR", "test_value_0", 0),
+    std::make_tuple("SUNSHINE_UNIT_TEST_ENV_VAR", "test_value_1", 0),
+    std::make_tuple("", "test_value", -1)));