diff --git a/test/trig_functions/test_trig_functions.c b/test/trig_functions/test_trig_functions.c
index 8b13789..115d0c9 100644
--- a/test/trig_functions/test_trig_functions.c
+++ b/test/trig_functions/test_trig_functions.c
@@ -1 +1,31 @@
+#include "unity.h"
+#include "trig_functions.h"
+#define PI 3.14159265
 
+void setUp(void){}
+
+void tearDown(void){}
+
+void test_sin() {
+    TEST_ASSERT_EQUAL_DOUBLE(0.0, calculate_sin(0));
+    TEST_ASSERT_EQUAL_DOUBLE(1.0, calculate_sin(PI/2));
+    TEST_ASSERT_EQUAL_DOUBLE(0.0, calculate_sin(PI));
+    TEST_ASSERT_EQUAL_DOUBLE(-1.0, calculate_sin(3*PI/2));
+    TEST_ASSERT_EQUAL_DOUBLE(0.0, calculate_sin(2*PI));
+}
+
+void test_cos() {
+    TEST_ASSERT_EQUAL_DOUBLE(1.0, calculate_cos(0));
+    TEST_ASSERT_EQUAL_DOUBLE(0.0, calculate_cos(PI/2));
+    TEST_ASSERT_EQUAL_DOUBLE(-1.0, calculate_cos(PI));
+    TEST_ASSERT_EQUAL_DOUBLE(0.0, calculate_cos(3*PI/2));
+    TEST_ASSERT_EQUAL_DOUBLE(1.0, calculate_cos(2*PI));
+}
+
+void test_tan() {
+    TEST_ASSERT_EQUAL_DOUBLE(0.0, calculate_tan(0));
+    TEST_ASSERT_EQUAL_DOUBLE(INFINITY, calculate_tan(PI/2)); // Tangens von 90 Grad ist unendlich
+    TEST_ASSERT_EQUAL_DOUBLE(0.0, calculate_tan(PI));
+    TEST_ASSERT_EQUAL_DOUBLE(INFINITY, calculate_tan(3*PI/2)); // Tangens von 270 Grad ist unendlich
+    TEST_ASSERT_EQUAL_DOUBLE(0.0, calculate_tan(2*PI));
+}