MIN_VALUEの値のテスト

LimitValueTest.java

public class LimitValueTest {
    @Test
    public void limitOfInteger() {
        assertEquals(2147483647, Integer.MAX_VALUE);
        assertEquals(0x7fffffff, Integer.MAX_VALUE);
        assertEquals(-2147483648, Integer.MIN_VALUE);
        assertEquals(-0x80000000, Integer.MIN_VALUE);
    }
    
    @Test
    public void limitOfLong() {
        assertEquals(9223372036854775807L, Long.MAX_VALUE);
        assertEquals(0x7fffffffffffffffL, Long.MAX_VALUE);
        assertEquals(-9223372036854775808L, Long.MIN_VALUE);
        assertEquals(-0x8000000000000000L, Long.MIN_VALUE);
    }
    
    @Test
    public void limitOfFloatingPointTypes() {
        assertTrue("MIN_VALUE is not a negative", 0 < Double.MIN_VALUE);
        assertTrue("MIN_VALUE is not a negative", 0 < Float.MIN_VALUE);
        
        assertEquals(Double.longBitsToDouble(0x1), Double.MIN_VALUE, 0);
        assertEquals(Float.intBitsToFloat(0x1), Float.MIN_VALUE, 0);
    }
    
    @Test
    public void absoluteValueOfMinimumValue() {
        assertEquals(Integer.MIN_VALUE, -Integer.MIN_VALUE);
        assertEquals(Long.MIN_VALUE, -Long.MIN_VALUE);
        
        assertEquals(0x80000000, -0x80000000);
        assertEquals(0x8000000000000000L, -0x8000000000000000L);
    }
}