Android Open Source - AstroPhysCalc Fraction Test

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License

The source code is released under:
Apache License
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Java Source Code

package org.astrophyscalc;
//from  w w  w. j a  v a  2s .c o m
import org.junit.Assert;
import org.junit.Test;

public class FractionTest extends Assert {

  @Test
  public void testCreate() {
    int num = -5;
    int den = 0;

    // Denominator of zero
    String exceptionMsg = "";
    try {
      Fraction.create(num, den);
    }
    catch (final Exception ex) {
      exceptionMsg = ex.getMessage();
    }
    assertEquals(Fraction.DENOMINATOR_ZERO, exceptionMsg);

    // Positive, negative
    Fraction fraction = Fraction.create(5, -8);
    assertEquals(-5, fraction.getNumerator());
    assertEquals(8, fraction.getDenominator());

    // Positive, positive
    fraction = Fraction.create(5, 8);
    assertEquals(5, fraction.getNumerator());
    assertEquals(8, fraction.getDenominator());

    // Negative, positive
    fraction = Fraction.create(-5, 8);
    assertEquals(-5, fraction.getNumerator());
    assertEquals(8, fraction.getDenominator());

    // Negative, negative
    fraction = Fraction.create(-5, -8);
    assertEquals(5, fraction.getNumerator());
    assertEquals(8, fraction.getDenominator());
  }

  @Test
  public void testIsOne() {
    // 1, 1
    Fraction fraction = Fraction.create(1, 1);
    assertEquals(true, fraction.isOne());

    // 2, 2
    fraction = Fraction.create(2, 2);
    assertEquals(true, fraction.isOne());

    // -5, -5
    fraction = Fraction.create(-5, -5);
    assertEquals(true, fraction.isOne());

    // 1, -1
    fraction = Fraction.create(1, -1);
    assertEquals(false, fraction.isOne());
  }

  @Test
  public void testIsZero() {
    // 0, 5
    Fraction fraction = Fraction.create(0, 5);
    assertEquals(true, fraction.isZero());

    // -0, 3
    fraction = Fraction.create(-0, 3);
    assertEquals(true, fraction.isZero());

    // -1, 3
    fraction = Fraction.create(-1, 3);
    assertEquals(false, fraction.isZero());
  }

  @Test
  public void testEquals() {
    int num1 = 1;
    int den1 = 2;

    int num2 = 5;
    int den2 = -7;

    Fraction fraction1;
    Fraction fraction2;

    // Fraction, null
    fraction1 = Fraction.create(num1, den1);
    assertEquals(false, fraction1.equals(null));

    // Fraction, object
    fraction1 = Fraction.create(num1, den1);
    assertEquals(false, fraction1.equals(new Object()));

    // equal, equal
    fraction1 = Fraction.create(num1, den1);
    fraction2 = Fraction.create(num1, den1);
    assertEquals(true, fraction1.equals(fraction2));

    // equal, not equal
    fraction1 = Fraction.create(num1, den1);
    fraction2 = Fraction.create(num1, den2);
    assertEquals(false, fraction1.equals(fraction2));

    // not equal, equal
    fraction1 = Fraction.create(num1, den1);
    fraction2 = Fraction.create(num2, den1);
    assertEquals(false, fraction1.equals(fraction2));

    // not equal, not equal
    fraction1 = Fraction.create(num1, den1);
    fraction2 = Fraction.create(num2, den2);
    assertEquals(false, fraction1.equals(fraction2));

    // One, one
    fraction1 = Fraction.ONE;
    fraction2 = Fraction.ONE;
    assertEquals(true, fraction1.equals(fraction2));

    // One, One
    fraction1 = Fraction.ONE;
    fraction2 = Fraction.create(-1, -1);
    assertEquals(true, fraction1.equals(fraction2));

    // One, fraction not one
    fraction1 = Fraction.ONE;
    fraction2 = Fraction.create(1, 7);
    assertEquals(false, fraction1.equals(fraction2));
  }

  @Test
  public void testToDouble() {
    int num1 = 1;
    int den1 = 2;

    // Fraction, null
    Fraction fraction1 = Fraction.create(num1, den1);
    assertEquals(1d/2d, fraction1.toDouble(), 0.0000000001d);
  }

  @Test
  public void testAdd() {
    int num1 = 1;
    int den1 = 2;

    int num2 = 5;
    int den2 = -7;

    Fraction fraction1;
    Fraction fraction2;
    Fraction fraction3;

    // Fraction, null
    fraction1 = Fraction.create(num1, den1);
    fraction2 = Fraction.create(num2, den2);
    fraction3 = Fraction.create(-3, 14);
    assertEquals(true, fraction3.equals(fraction1.add(fraction2)));
  }

  @Test
  public void testNegative() {
    int num1 = 1;
    int den1 = 2;

    int num2 = 5;
    int den2 = -7;

    Fraction fraction1;
    Fraction fraction2;

    // Fraction, null
    fraction1 = Fraction.create(num1, den1);
    assertEquals(true, Fraction.create(-num1, den1).equals(fraction1.negative()));

    fraction2 = Fraction.create(num2, den2);
    assertEquals(true, Fraction.create(-num2, den2).equals(fraction2.negative()));
  }

  @Test
  public void testSubtract() {
    int num1 = 1;
    int den1 = 2;

    int num2 = 5;
    int den2 = -7;

    Fraction fraction1;
    Fraction fraction2;
    Fraction fraction3;

    // Fraction, null
    fraction1 = Fraction.create(num1, den1);
    fraction2 = Fraction.create(num2, den2);
    fraction3 = Fraction.create(17, 14);
    assertEquals(true, fraction3.equals(fraction1.subtract(fraction2)));
  }

  @Test
  public void testPow() {
    int num1 = 1;
    int den1 = 2;

    int num2 = 5;
    int den2 = -7;

    Fraction fraction1;
    Fraction fraction2;
    Fraction exponent = Fraction.create(3, 7);

    // Fraction, null
    fraction1 = Fraction.create(num1, den1);
    assertEquals(true, Fraction.create(3, 14).equals(fraction1.pow(exponent)));

    fraction2 = Fraction.create(num2, den2);
    assertEquals(true, Fraction.create(-15, 49).equals(fraction2.pow(exponent)));
  }

}
Java Source Code List
