diff --git a/test/test_arithmeticMultiplication_Double.c b/test/test_arithmeticMultiplication_Double.c
new file mode 100644
index 0000000..2077e91
--- /dev/null
+++ b/test/test_arithmeticMultiplication_Double.c
@@ -0,0 +1,18 @@
+#include "unity.h"
+#include "../src/arithmeticMultiplication_Double.h"
+#include "limits.h"
+
+void setUp(void) {
+    // set up code here
+}
+
+void tearDown(void) {
+    // clean up code here
+}
+
+void test_arithmeticMultiplication_doubletimesdoubleequalsdouble(void) {
+    double expectedResult = 10.0;
+    double* result = multiplication_double(2.0, 5.0);
+    TEST_ASSERT_EQUAL_DOUBLE(expectedResult, *result);
+
+}
diff --git a/test/test_arithmeticMultiplication_Float.c b/test/test_arithmeticMultiplication_Float.c
new file mode 100644
index 0000000..8121145
--- /dev/null
+++ b/test/test_arithmeticMultiplication_Float.c
@@ -0,0 +1,18 @@
+#include "unity.h"
+#include "../src/arithmeticMultiplication_Float.h"
+#include "limits.h"
+
+void setUp(void) {
+    // set up code here
+}
+
+void tearDown(void) {
+    // clean up code here
+}
+
+void test_arithmeticMultiplication_floattimesfloatequalsfloat(void) {
+    float expectedResult = 10.0f;
+    float* result = multiplication_float(2.0f, 5.0f);
+    TEST_ASSERT_EQUAL_FLOAT(expectedResult, *result);
+
+}
diff --git a/test/test_convert_C_to_F.c b/test/test_convert_C_to_F.c
new file mode 100644
index 0000000..a657ecb
--- /dev/null
+++ b/test/test_convert_C_to_F.c
@@ -0,0 +1,28 @@
+#include "../src/convert_C_to_F.h"
+#include "unity.h"
+#include "limits.h"
+
+
+void setUp(void) {
+
+}
+
+void tearDown(void) {
+    // Clean up resources here if needed
+}
+
+void test_convert_temperature(void) {
+    float temperature = 100.0;
+    char from_unit = 'c';
+    char to_unit = 'f';
+
+    // Perform the conversion
+    float result = convert_temperature(temperature, from_unit, to_unit);
+
+    // Define the expected result (100 degrees Celsius to Fahrenheit is 212)
+    float expectedResult = 212;
+
+    // Assert the result
+    TEST_ASSERT_EQUAL_FLOAT(expectedResult, result);
+}
+
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));
+}
diff --git a/test/test_convert_kg_to_g.c b/test/test_convert_kg_to_g.c
new file mode 100644
index 0000000..53d0fd8
--- /dev/null
+++ b/test/test_convert_kg_to_g.c
@@ -0,0 +1,21 @@
+#include "unity.h"
+#include "../src/convert_kg_to_g.h"
+
+
+
+void setUp(void) {
+
+}
+
+// Test teardown function
+void tearDown(void) {
+    // This function will be called after each test
+}
+
+// Test case for kg_to_gram function
+void test_kg_to_gram(void) {
+    // Test case
+    double input = 2.5;
+    double expected_output = 2500.0;
+    TEST_ASSERT_EQUAL_DOUBLE(expected_output, kg_to_gram(input));
+}
diff --git a/test/test_convert_kg_to_ton.c b/test/test_convert_kg_to_ton.c
new file mode 100644
index 0000000..d68b700
--- /dev/null
+++ b/test/test_convert_kg_to_ton.c
@@ -0,0 +1,20 @@
+#include "unity.h" // Include the Unity header file
+#include "../src/convert_kg_to_ton.h"
+
+// Test setup function
+void setUp(void) {
+
+}
+
+// Test teardown function
+void tearDown(void) {
+    // This function will be called after each test
+}
+
+// Test case for kg_to_tons function
+void test_kg_to_tons(void) {
+    // Test case
+    double input = 2500.0;
+    double expected_output = 2.5;
+    TEST_ASSERT_EQUAL_DOUBLE(expected_output, kg_to_tons(input));
+}
diff --git a/test/test_convert_ton_to_kg.c b/test/test_convert_ton_to_kg.c
new file mode 100644
index 0000000..9d7ad2c
--- /dev/null
+++ b/test/test_convert_ton_to_kg.c
@@ -0,0 +1,20 @@
+#include "unity.h" // Include the Unity header file
+#include "../src/convert_ton_to_kg.h"
+#include "limits.h"
+// Test setup function
+void setUp(void) {
+    // This function will be called before each test
+}
+
+// Test teardown function
+void tearDown(void) {
+    // This function will be called after each test
+}
+
+// Test case for tons_to_kg function
+void test_tons_to_kg(void) {
+    // Test case
+    double input = 2.5;
+    double expected_output = 2500.0;
+    TEST_ASSERT_EQUAL_DOUBLE(expected_output, tons_to_kg(input));
+}
diff --git a/test/test_convert_ton_to_mt.c b/test/test_convert_ton_to_mt.c
new file mode 100644
index 0000000..bce3793
--- /dev/null
+++ b/test/test_convert_ton_to_mt.c
@@ -0,0 +1,20 @@
+#include "unity.h" // Include the Unity header file
+#include "../src/convert_ton_to_mt.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) {
+    // This function will be called after each test
+}
+
+// Test case for tons_to_megatons function
+void test_tons_to_megatons(void) {
+    // Test case
+    double input = 2500000; // 2.5 million tons
+    double expected_output = 2.5; // 2.5 megatons
+    TEST_ASSERT_EQUAL_DOUBLE(expected_output, tons_to_megatons(input));
+}