JUnit 单元测试：is_num_constant 方法测试用例

@Test public void testIsNumConstant() { String numConstant = '123'; boolean expectedResult = true; boolean actualResult = isNumConstant(numConstant); assertEquals(expectedResult, actualResult);

String notNumConstant = 'abc';
expectedResult = false;
actualResult = isNumConstant(notNumConstant);
assertEquals(expectedResult, actualResult);

}

private boolean isNumConstant(String str) { try { Double.parseDouble(str); return true; } catch (NumberFormatException e) { return false; } }