Test the following Java classes using JUnit providing 4 test cases that pass and 4 that fail, after fixing any errors: public static void showRange (char grade) { if (grade == 'A') System.out.println("90-100"); else if (grade == 'B') System.out.println("80-90"); else if (grade == 'C') System.out.println("70-80"); else if (grade == 'D') System.out.println("60-70"); else System.out.println("

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