OS_FAMILY = getOsFamily();
        IS_WINDOWS = isFamily(FAMILY_WINDOWS);
    }

    private Os() {}

    /**
     * Determines if the OS on which Maven is executing matches the
     * given OS family.
     *
     * @param family the family to check for
     * @return true if the OS matches
     *
     */
    public static boolean isFamily(String family) {
        return isFamily(family, OS_NAME);

        assertTrue(instance.equals(instance));
        assertTrue(instance.equals(new FileModelSource(tempFile)));
    }

    @Test
    void testWindowsPaths() throws Exception {
        assumeTrue(Os.isFamily("Windows"));

        File upperCaseFile = createTempFile("TESTE");
        String absolutePath = upperCaseFile.getAbsolutePath();
        File lowerCaseFile = new File(absolutePath.toLowerCase());

        boolean reverse = false;

        if (test.startsWith("!")) {
            reverse = true;
            test = test.substring(1);
        }

        boolean result = Os.isFamily(test, actualName);

        return reverse != result;
    }

        String test = family;
        boolean reverse = false;

        if (test.startsWith("!")) {
            reverse = true;
            test = test.substring(1);
        }

        boolean result = Os.isFamily(test);

        if (reverse) {
            return !result;
        } else {
            return result;
        }
    }