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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
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 */

/*
 * @test
 * @summary <rdar://problem/1400112> EXT a2: Math package error is causing this applet to print out the wrong value
 * @summary com.apple.junit.java.lang.Math
 */

import junit.framework.*;

public class R1400112FloatPrecisionTest extends TestCase {
    protected static final double kLog10 = Math.log(10);
    protected static double ERRMARGIN;
    protected double origDouble;
    protected double resultingDouble;

    protected void setUp() {
        ERRMARGIN = .000000001;
        origDouble = -1.56;
        resultingDouble    = origDouble;
    }

    public static Test suite() {
        return new TestSuite(R1400112FloatPrecisionTest.class);
    }

    final public static double roundToXSigDigs(double resultingDouble, int sigs) {
        double  absDouble = Math.abs(resultingDouble);
        double roundFactor = Math.log(absDouble);

        if( absDouble < ERRMARGIN ) { // it's close enough to zero for us
            return(0);
        }
        roundFactor /= kLog10;
        roundFactor = Math.floor(roundFactor);
        roundFactor = sigs-1-roundFactor;
        roundFactor *= kLog10;
        roundFactor = Math.exp(roundFactor);
        resultingDouble *= roundFactor;
        resultingDouble = Math.round(resultingDouble);
        resultingDouble /= roundFactor;
        return (resultingDouble);
    }

    public void testR1400112FloatPrecision() {
        resultingDouble = roundToXSigDigs(resultingDouble, 4);
        assertTrue ("Math on doubles is functional", Math.abs(resultingDouble - origDouble) <  ERRMARGIN );
    }

    public static void main (String[] args) throws RuntimeException {
        TestResult tr = junit.textui.TestRunner.run(suite());
        if ((tr.errorCount() != 0) || (tr.failureCount() != 0)) {
            throw new RuntimeException("### FAILED: unexpected JUnit errors or failures.");
        }
    }
}