示例#1
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 // Relies on the correctness of log10(BigInteger, {HALF_UP,HALF_DOWN}).
 @GwtIncompatible // TODO
 public void testLog10HalfEven() {
   for (BigInteger x : POSITIVE_BIGINTEGER_CANDIDATES) {
     int halfEven = BigIntegerMath.log10(x, HALF_EVEN);
     // Now figure out what rounding mode we should behave like (it depends if FLOOR was
     // odd/even).
     boolean floorWasEven = (BigIntegerMath.log10(x, FLOOR) & 1) == 0;
     assertEquals(BigIntegerMath.log10(x, floorWasEven ? HALF_DOWN : HALF_UP), halfEven);
   }
 }
示例#2
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 // Relies on the correctness of log10(BigInteger, FLOOR).
 @GwtIncompatible // TODO
 public void testLog10Exact() {
   for (BigInteger x : POSITIVE_BIGINTEGER_CANDIDATES) {
     int logFloor = BigIntegerMath.log10(x, FLOOR);
     boolean expectSuccess = TEN.pow(logFloor).equals(x);
     try {
       assertEquals(logFloor, BigIntegerMath.log10(x, UNNECESSARY));
       assertTrue(expectSuccess);
     } catch (ArithmeticException e) {
       assertFalse(expectSuccess);
     }
   }
 }
示例#3
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 @GwtIncompatible // TODO
 public void testLog10TrivialOnPowerOf10() {
   BigInteger x = BigInteger.TEN.pow(100);
   for (RoundingMode mode : ALL_ROUNDING_MODES) {
     assertEquals(100, BigIntegerMath.log10(x, mode));
   }
 }
示例#4
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 @GwtIncompatible // TODO
 public void testLog10Ceiling() {
   for (BigInteger x : POSITIVE_BIGINTEGER_CANDIDATES) {
     for (RoundingMode mode : asList(CEILING, UP)) {
       int result = BigIntegerMath.log10(x, mode);
       assertTrue(TEN.pow(result).compareTo(x) >= 0);
       assertTrue(result == 0 || TEN.pow(result - 1).compareTo(x) < 0);
     }
   }
 }
示例#5
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 @GwtIncompatible // TODO
 public void testLog10Floor() {
   for (BigInteger x : POSITIVE_BIGINTEGER_CANDIDATES) {
     for (RoundingMode mode : asList(FLOOR, DOWN)) {
       int result = BigIntegerMath.log10(x, mode);
       assertTrue(TEN.pow(result).compareTo(x) <= 0);
       assertTrue(TEN.pow(result + 1).compareTo(x) > 0);
     }
   }
 }
示例#6
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 @GwtIncompatible // TODO
 public void testLog10NegativeAlwaysThrows() {
   for (RoundingMode mode : ALL_ROUNDING_MODES) {
     try {
       BigIntegerMath.log10(BigInteger.valueOf(-1), mode);
       fail("Expected IllegalArgumentException");
     } catch (IllegalArgumentException expected) {
     }
   }
 }
示例#7
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 @GwtIncompatible // TODO
 public void testLog10HalfDown() {
   for (BigInteger x : POSITIVE_BIGINTEGER_CANDIDATES) {
     int result = BigIntegerMath.log10(x, HALF_DOWN);
     BigInteger x2 = x.pow(2);
     // x^2 <= 10^(2 * result + 1), or else we would have rounded up
     assertTrue(TEN.pow(2 * result + 1).compareTo(x2) >= 0);
     // x^2 > 10^(2 * result - 1), or else we would have rounded down
     assertTrue(result == 0 || TEN.pow(2 * result - 1).compareTo(x2) < 0);
   }
 }