diff --git a/test/test_convert_g_to_mg.c b/test/test_convert_g_to_mg.c
new file mode 100644
index 0000000..46b6755
--- /dev/null
+++ b/test/test_convert_g_to_mg.c
@@ -0,0 +1,20 @@
+#include "unity.h" // Include the Unity header file
+#include "../src/convert_g_to_mg.h" // Include the header file containing the function to be tested
+
+// Test setup function
+void setUp(void) {
+    // This function will be called before each test
+}
+
+// Test teardown function
+void tearDown(void) {
+
+}
+
+// Test case for g_to_mg function
+void test_g_to_mg(void) {
+    // Test case
+    double input = 1.0;
+    double expected_output = 1000.0;
+    TEST_ASSERT_EQUAL_DOUBLE(expected_output, g_to_mg(input));
+}