add test for logarithmus with decimals

test/test_logarithmus.c

@@ -65,5 +65,19 @@ void test_logarithmic_function_with_integers(void){
     TEST_ASSERT_DOUBLE_WITHIN(0.000001, 2.0, r4);
 }
 
+void test_logarithmic_function_with_decimals(void){
+    double r1, r2, r3, r4;
+
+    r1 = logX(0.1289, 26.5);
+    r2 = logX(7.64, 8.314);
+    r3 = logX(3.0, 2.4587);
+    r4 = logX(9.0, 94.6584);
+
+    TEST_ASSERT_DOUBLE_WITHIN(0.000001, -1.599607, r1);
+    TEST_ASSERT_DOUBLE_WITHIN(0.000001, 1.041577, r2);
+    TEST_ASSERT_DOUBLE_WITHIN(0.000001, 0.818881, r3);
+    TEST_ASSERT_DOUBLE_WITHIN(0.000001, 2.070919, r4);
+}
+
 
 #endif // TEST