diff --git a/src/temperatur.c b/src/temperatur.c
index 7a18e9e..3568a8f 100644
--- a/src/temperatur.c
+++ b/src/temperatur.c
@@ -1,4 +1,5 @@
 #include <stdio.h>
+#include "temperatur.h"
 
 float CzuF(float tempC){
 	return (tempC * 9/5) + 32;
@@ -20,4 +21,4 @@ int run_TemperaturRechner(){
 		
 
 	return 0;
-}
\ No newline at end of file
+}
diff --git a/src/temperatur.h b/src/temperatur.h
new file mode 100644
index 0000000..30e1a0f
--- /dev/null
+++ b/src/temperatur.h
@@ -0,0 +1,6 @@
+#ifndef TEMPERATUR_H
+#define TEMPERATUR_H
+
+float CzuF(float tempC);
+
+#endif //TEMPERATUR_H
diff --git a/test/test_temperatur.c b/test/test_temperatur.c
new file mode 100644
index 0000000..e46691b
--- /dev/null
+++ b/test/test_temperatur.c
@@ -0,0 +1,22 @@
+#ifdef TEST
+
+#include "unity.h"
+
+#include "temperatur.h"
+
+void setUp(void)
+{
+}
+
+void tearDown(void)
+{
+}
+
+void test_temperaturRechner_CzuF(void)
+{
+float result = CzuF(25);
+float expected = 77;
+TEST_ASSERT_EQUAL(expected, result);
+}
+
+#endif