public void testRoundInfiniteToIntAlwaysFails() {
for (RoundingMode mode : ALL_ROUNDING_MODES) {
try {
DoubleMath.roundToInt(Double.POSITIVE_INFINITY, mode);
fail("Expected ArithmeticException");
} catch (ArithmeticException expected) {
}
try {
DoubleMath.roundToInt(Double.NEGATIVE_INFINITY, mode);
fail("Expected ArithmeticException");
} catch (ArithmeticException expected) {
}
}
}
public void testRoundExactFractionalDoubleToIntFails() {
for (double d : FRACTIONAL_DOUBLE_CANDIDATES) {
try {
DoubleMath.roundToInt(d, UNNECESSARY);
fail("Expected ArithmeticException");
} catch (ArithmeticException expected) {
}
}
}
public void testRoundNaNToIntAlwaysFails() {
for (RoundingMode mode : ALL_ROUNDING_MODES) {
try {
DoubleMath.roundToInt(Double.NaN, mode);
fail("Expected ArithmeticException");
} catch (ArithmeticException expected) {
}
}
}
public void testRoundExactIntegralDoubleToInt() {
for (double d : INTEGRAL_DOUBLE_CANDIDATES) {
BigDecimal expected = new BigDecimal(d).setScale(0, UNNECESSARY);
boolean isInBounds =
expected.compareTo(MAX_INT_AS_BIG_DECIMAL) <= 0
& expected.compareTo(MIN_INT_AS_BIG_DECIMAL) >= 0;
try {
assertEquals(expected.intValue(), DoubleMath.roundToInt(d, UNNECESSARY));
assertTrue(isInBounds);
} catch (ArithmeticException e) {
assertFalse(isInBounds);
}
}
}
public void testRoundFractionalDoubleToInt() {
for (double d : FRACTIONAL_DOUBLE_CANDIDATES) {
for (RoundingMode mode : ALL_SAFE_ROUNDING_MODES) {
BigDecimal expected = new BigDecimal(d).setScale(0, mode);
boolean isInBounds =
expected.compareTo(MAX_INT_AS_BIG_DECIMAL) <= 0
& expected.compareTo(MIN_INT_AS_BIG_DECIMAL) >= 0;
try {
assertEquals(expected.intValue(), DoubleMath.roundToInt(d, mode));
assertTrue(isInBounds);
} catch (ArithmeticException e) {
assertFalse(isInBounds);
}
}
}
}
