diff --git a/telldus-core/tests/common/StringsTest.cpp b/telldus-core/tests/common/StringsTest.cpp
index d1548ab6..c71a0e97 100644
--- a/telldus-core/tests/common/StringsTest.cpp
+++ b/telldus-core/tests/common/StringsTest.cpp
@@ -1,4 +1,5 @@
 #include "StringsTest.h"
+#include "Strings.h"
 
 CPPUNIT_TEST_SUITE_REGISTRATION (StringsTest);
 
@@ -10,22 +11,9 @@ void StringsTest :: tearDown (void)
 {
 }
 
-void StringsTest :: addTest (void)
-{
-    // check subtraction results
-    CPPUNIT_ASSERT_EQUAL (1, 1);
-    CPPUNIT_ASSERT_EQUAL (1, 2);
-}
-
-void StringsTest :: subTest (void)
-{
-    // check addition results
-    CPPUNIT_ASSERT_EQUAL (1, 1);
-}
-
-
-void StringsTest :: equalTest (void)
-{
-    // test successful, if true is returned
-    CPPUNIT_ASSERT (1 == 1);
+void StringsTest :: formatfTest (void) {
+	CPPUNIT_ASSERT_EQUAL(std::string("42"), TelldusCore::formatf("%u", 42));
+	CPPUNIT_ASSERT_EQUAL(std::string("0"), TelldusCore::formatf("%u", 42.1));
+	CPPUNIT_ASSERT_EQUAL(std::string("2A"), TelldusCore::formatf("%X", 42));
+	CPPUNIT_ASSERT_EQUAL(std::string("42"), TelldusCore::formatf("%s", "42"));
 }
diff --git a/telldus-core/tests/common/StringsTest.h b/telldus-core/tests/common/StringsTest.h
index b75c1f7a..4c5642c7 100644
--- a/telldus-core/tests/common/StringsTest.h
+++ b/telldus-core/tests/common/StringsTest.h
@@ -3,24 +3,19 @@
 
 #include <cppunit/TestFixture.h>
 #include <cppunit/extensions/HelperMacros.h>
-#include "Strings.h"
 
 class StringsTest : public CPPUNIT_NS :: TestFixture
 {
-    CPPUNIT_TEST_SUITE (StringsTest);
-    CPPUNIT_TEST (addTest);
-    CPPUNIT_TEST (subTest);
-    CPPUNIT_TEST (equalTest);
-    CPPUNIT_TEST_SUITE_END ();
+	CPPUNIT_TEST_SUITE (StringsTest);
+	CPPUNIT_TEST (formatfTest);
+	CPPUNIT_TEST_SUITE_END ();
 
-    public:
-        void setUp (void);
-        void tearDown (void);
+public:
+	void setUp (void);
+	void tearDown (void);
 
-    protected:
-        void addTest (void);
-        void subTest (void);
-        void equalTest (void);
+protected:
+	void formatfTest(void);
 };
 
 #endif //STRINGSTEST_H