diff --git a/build-project.sh b/build-project.sh
index 43a0588..51cf723 100755
--- a/build-project.sh
+++ b/build-project.sh
@@ -1,4 +1,5 @@
 clear
+ceedling test:all
 cd src/
 gcc main.c -o main
 ./main
diff --git a/tests/test_calculatorSubtract.c b/tests/test_calculatorSubtract.c
index 498d037..abf9859 100644
--- a/tests/test_calculatorSubtract.c
+++ b/tests/test_calculatorSubtract.c
@@ -12,9 +12,105 @@ void tearDown(void)
 {
 }
 
-void test_calculatorSubtract_NeedToImplement(void)
+
+void test1_calculatorSubtract(void)
+{
+    float p, q, a, e;
+    p = 123.211;
+    q = 112.21;
+    e = p - q;
+    a = calculatorSubtract(p, q);
+    TEST_ASSERT_EQUAL_FLOAT(e, a);
+}
+
+void test2_calculatorSubtract(void)
+{
+    float p, q, a, e;
+    p = 13.21;
+    q = 112.21;
+    e = p - q;
+    a = calculatorSubtract(p, q);
+    TEST_ASSERT_EQUAL_FLOAT(e, a);
+}
+
+void test3_calculatorSubtract(void)
+{
+    float p, q, a, e;
+    p = 12231.211;
+    q = 1122.21;
+    e = p - q;
+    a = calculatorSubtract(p, q);
+    TEST_ASSERT_EQUAL_FLOAT(e, a);
+}
+
+void test4_calculatorSubtract(void)
+{
+    float p, q, a, e;
+    p = 113453.211;
+    q = 11254.21;
+    e = p - q;
+    a = calculatorSubtract(p, q);
+    TEST_ASSERT_EQUAL_FLOAT(e, a);
+}
+
+void test5_calculatorSubtract(void)
+{
+    float p, q, a, e;
+    p = 12133.211;
+    q = 112.231;
+    e = p - q;
+    a = calculatorSubtract(p, q);
+    TEST_ASSERT_EQUAL_FLOAT(e, a);
+}
+
+void test6_calculatorSubtract(void)
+{
+    float p, q, a, e;
+    p = 1133.201;
+    q = 11221.21;
+    e = p - q;
+    a = calculatorSubtract(p, q);
+    TEST_ASSERT_EQUAL_FLOAT(e, a);
+}
+
+void test7_calculatorSubtract(void)
+{
+    float p, q, a, e;
+    p = 12213.2211;
+    q = 111.21;
+    e = p - q;
+    a = calculatorSubtract(p, q);
+    TEST_ASSERT_EQUAL_FLOAT(e, a);
+}
+
+void test8_calculatorSubtract(void)
+{
+    float p, q, a, e;
+    p = 16213.711;
+    q = 1214.2251;
+    e = p - q;
+    a = calculatorSubtract(p, q);
+    TEST_ASSERT_EQUAL_FLOAT(e, a);
+}
+
+void test9_calculatorSubtract(void)
+{
+    float p, q, a, e;
+    p = 1933.611;
+    q = 1432.21;
+    e = p - q;
+    a = calculatorSubtract(p, q);
+    TEST_ASSERT_EQUAL_FLOAT(e, a);
+}
+
+void test10_calculatorSubtract(void)
 {
-    TEST_IGNORE_MESSAGE("Need to Implement calculatorSubtract");
+    float p, q, a, e;
+    p = 1233.811;
+    q = 1121.131;
+    e = p - q;
+    a = calculatorSubtract(p, q);
+    TEST_ASSERT_EQUAL_FLOAT(e, a);
 }
 
 #endif // TEST