diff --git a/src/bmi.c b/src/bmi.c
index b93dbd6..b9e7129 100644
--- a/src/bmi.c
+++ b/src/bmi.c
@@ -1,4 +1,5 @@
 #include <stdio.h>
+#include "bmi.h"
 
 float calcBMI(float a, float b){
 	if(a > 0 && b > 0)
diff --git a/src/bmi.h b/src/bmi.h
new file mode 100644
index 0000000..b1a92c8
--- /dev/null
+++ b/src/bmi.h
@@ -0,0 +1,6 @@
+#ifndef BMI_H
+#define BMI_H
+
+float calcBMI(float height, float weight);
+
+#endif //BMI_H
diff --git a/test/test_bmi.c b/test/test_bmi.c
new file mode 100644
index 0000000..e0530fc
--- /dev/null
+++ b/test/test_bmi.c
@@ -0,0 +1,22 @@
+#ifdef TEST
+
+#include "unity.h"
+
+#include "bmi.h"
+
+void setUp(void)
+{
+}
+
+void tearDown(void)
+{
+}
+
+void test_berechnung_BMI(void)
+{
+float result = calcBMI(2, 100);
+float expected = 25;
+TEST_ASSERT_EQUAL(expected, result);
+}
+
+#endif