diff --git a/src/test/test_funktionen.c b/src/test/test_funktionen.c
index 67e690f..beeee75 100644
--- a/src/test/test_funktionen.c
+++ b/src/test/test_funktionen.c
@@ -149,5 +149,11 @@ void test_cosine(void) {
     // Add more test cases for different inputs and expected outputs
 }
 
+void test_tangent(void) {
+    float result = tangent(1.5);
+    TEST_ASSERT_EQUAL_FLOAT(14.101419, result);
+    // Add more test cases for different inputs and expected outputs
+}
+
 
 #endif
\ No newline at end of file