Add unsetenv and also setenv macros and tests

src/common/include/com/amazonaws/kinesis/video/common/CommonDefs.h

@@ -888,7 +888,15 @@ extern PUBLIC_API atomicXor globalAtomicXor;
 //
 // Environment variables
 //
-#define GETENV getenv
+#if defined __WINDOWS_BUILD__
+#define GETENV             GetEnvironmentVariable
+#define SETENV(var, value) SetEnvironmentVariable(var, value)
+#define UNSETENV(var)      SetEnvironmentVariable(var, NULL)
+#else
+#define GETENV             getenv
+#define SETENV(var, value) setenv(var, value, 1)
+#define UNSETENV           unsetenv
+#endif
 
 //
 // Empty string definition

tst/common/CommonDefsTest.cpp

@@ -11,3 +11,55 @@ TEST(CommonDefsTest, GetEnvWorks)
 {
     EXPECT_NE(nullptr, GETENV("PATH")) << "PATH environment variable is unexpectedly unset, or GETENV doesn't work";
 }
+
+TEST(CommonDefsTest, SetEnvWorks)
+{
+    const char* test_var = "MY_TEST_VAR";
+    const char* test_value = "test_value";
+
+    // Save the original value of the environment variable, if it exists
+    const char* original_value = GETENV(test_var);
+
+    // Set the environment variable to a new value
+    SETENV(test_var, test_value);
+
+    // Verify if the environment variable was set correctly
+    EXPECT_STREQ(test_value, GETENV(test_var)) << "Failed to set environment variable " << test_var;
+
+    // Restore the original environment variable value (if any)
+    if (original_value) {
+        SETENV(test_var, original_value);
+    } else {
+        // If it was not set, unset the variable
+        UNSETENV(test_var);
+    }
+}
+
+TEST(CommonDefsTest, UnsetEnvWorks)
+{
+    const char* test_var = "MY_TEST_VAR";
+    const char* test_value = "test_value";
+
+    // Save the original value of the environment variable, if it exists
+    const char* original_value = GETENV(test_var);
+
+    // Set the environment variable to a new value
+    SETENV(test_var, test_value);
+
+    // Verify if the environment variable was set correctly
+    EXPECT_STREQ(test_value, GETENV(test_var)) << "Failed to set environment variable " << test_var;
+
+    // Unset the environment variable
+    UNSETENV(test_var);
+
+    // Verify if the environment variable is properly unset
+    EXPECT_EQ(nullptr, GETENV(test_var)) << "Failed to unset environment variable " << test_var;
+
+    // Restore the original environment variable value (if any)
+    if (original_value) {
+        SETENV(test_var, original_value);
+    } else {
+        // If it was not set, unset the variable
+        UNSETENV(test_var);
+    }
+}