refactor: fix test, remove os dependent part form assertion (planning#667)

tools/src/test/java/dev/fitko/fitconnect/tools/KeyStoreReaderTest.java

@@ -60,9 +60,9 @@ class KeyStoreReaderTest {
     void loadKeyStoreWithIllegalPath() {
 
         // When
-        var exception = assertThrows(FitConnectCertificateException.class, () -> uut.loadKeyStore("wrongPath", "password"));
+        var exception = assertThrows(FitConnectCertificateException.class, () -> uut.loadKeyStore("/wrong/path", "password"));
 
         // Then
-        assertThat(exception.getMessage(), containsString("The system cannot find the file specified"));
+        assertThat(exception.getCause().getMessage(), containsString("\\wrong\\path"));
     }
 }
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