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Fixed #103. test: Added branch coverage for Matrix.subtract #106

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Merged
merged 1 commit into from
Mar 3, 2022
Merged

Fixed #103. test: Added branch coverage for Matrix.subtract #106

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132 changes: 131 additions & 1 deletion test/com/jwetherell/algorithms/data_structures/test/MatrixTests.java
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Original file line number Diff line number Diff line change
Expand Up @@ -219,4 +219,134 @@ public void testAddBigDecimal() {
assertTrue(actual.get(0, 0).compareTo(wrong1.get(0, 0)) != 0);
assertTrue(actual.get(0, 0).compareTo(wrong2.get(0, 0)) != 0);
}
}

// Requirement: Matrix subtraction should work correctly with Long values.
@Test
public void testSubtractLong() {
Matrix<Long> matrix1 = new Matrix<Long>(2, 2);
matrix1.set(0, 0, Long.valueOf(1));
matrix1.set(0, 1, Long.valueOf(2));
matrix1.set(1, 0, Long.valueOf(3));
matrix1.set(1, 1, Long.valueOf(4));

Matrix<Long> matrix2 = new Matrix<Long>(2, 2);
matrix2.set(0, 0, Long.valueOf(1*2));
matrix2.set(0, 1, Long.valueOf(2*2));
matrix2.set(1, 0, Long.valueOf(3*2));
matrix2.set(1, 1, Long.valueOf(4*2));

Matrix<Long> actualResult = matrix1.subtract(matrix2);

Matrix<Long> expectedResult = new Matrix<Long>(2, 2);
expectedResult.set(0, 0, Long.valueOf(-1));
expectedResult.set(0, 1, Long.valueOf(-2));
expectedResult.set(1, 0, Long.valueOf(-3));
expectedResult.set(1, 1, Long.valueOf(-4));

assertArrayEquals(expectedResult.getRow(0), actualResult.getRow(0));
assertArrayEquals(expectedResult.getRow(1), actualResult.getRow(1));
}

// Requirement: Matrix subtraction should work correctly with BigInteger values.
@Test
public void testSubtractBigInteger() {
Matrix<BigInteger> matrix1 = new Matrix<BigInteger>(2, 2);
matrix1.set(0, 0, BigInteger.valueOf(1));
matrix1.set(0, 1, BigInteger.valueOf(2));
matrix1.set(1, 0, BigInteger.valueOf(3));
matrix1.set(1, 1, BigInteger.valueOf(4));

Matrix<BigInteger> matrix2 = new Matrix<BigInteger>(2, 2);
matrix2.set(0, 0, BigInteger.valueOf(1*2));
matrix2.set(0, 1, BigInteger.valueOf(2*2));
matrix2.set(1, 0, BigInteger.valueOf(3*2));
matrix2.set(1, 1, BigInteger.valueOf(4*2));

Matrix<BigInteger> actualResult = matrix1.subtract(matrix2);

Matrix<BigInteger> expectedResult = new Matrix<BigInteger>(2, 2);
expectedResult.set(0, 0, BigInteger.valueOf(-1));
expectedResult.set(0, 1, BigInteger.valueOf(-2));
expectedResult.set(1, 0, BigInteger.valueOf(-3));
expectedResult.set(1, 1, BigInteger.valueOf(-4));

assertArrayEquals(expectedResult.getRow(0), actualResult.getRow(0));
assertArrayEquals(expectedResult.getRow(1), actualResult.getRow(1));
}

// Requirement: Matrix subtraction should work correctly with Float values.
@Test
public void testSubtractFloat() {
Matrix<Float> matrix1 = new Matrix<Float>(1, 1);
matrix1.set(0, 0, new Float(1.1));

Matrix<Float> matrix2 = new Matrix<Float>(1, 1);
matrix2.set(0, 0, new Float(1.1*2));

Matrix<Float> actual = matrix1.subtract(matrix2);

Matrix<Float> expected = new Matrix<Float>(1, 1);
expected.set(0, 0, new Float(-1.1));

Matrix<Float> wrong1 = new Matrix<Float>(1, 1);
wrong1.set(0, 0, new Float(-1.05));

Matrix<Float> wrong2 = new Matrix<Float>(1, 1);
wrong2.set(0, 0, new Float(1.15));

assertTrue(Math.abs(actual.get(0, 0) - expected.get(0, 0)) < 0.00001);
assertTrue(Float.compare(actual.get(0, 0), wrong1.get(0, 0)) != 0);
assertTrue(Float.compare(actual.get(0, 0), wrong2.get(0, 0)) != 0);
}

// Requirement: Matrix subtraction should work correctly with Double values.
@Test
public void testSubtractDouble() {
Matrix<Double> matrix1 = new Matrix<Double>(1, 1);
matrix1.set(0, 0, new Double(1.1));

Matrix<Double> matrix2 = new Matrix<Double>(1, 1);
matrix2.set(0, 0, new Double(1.1*2));

Matrix<Double> actual = matrix1.subtract(matrix2);

Matrix<Double> expected = new Matrix<Double>(1, 1);
expected.set(0, 0, new Double(-1.1));

Matrix<Double> wrong1 = new Matrix<Double>(1, 1);
wrong1.set(0, 0, new Double(-1.05));

Matrix<Double> wrong2 = new Matrix<Double>(1, 1);
wrong2.set(0, 0, new Double(1.15));

assertTrue(Math.abs(actual.get(0, 0) - expected.get(0, 0)) < 0.00001);
assertTrue(Double.compare(actual.get(0, 0), wrong1.get(0, 0)) != 0);
assertTrue(Double.compare(actual.get(0, 0), wrong2.get(0, 0)) != 0);
}

// Requirement: Matrix subtraction should work correctly with BigDecimal values.
@Test
public void testSubtractBigDecimal() {
Matrix<BigDecimal> matrix1 = new Matrix<BigDecimal>(1, 1);
matrix1.set(0, 0, new BigDecimal(1.1));

Matrix<BigDecimal> matrix2 = new Matrix<BigDecimal>(1, 1);
matrix2.set(0, 0, new BigDecimal(1.1*2));

Matrix<BigDecimal> actual = matrix1.subtract(matrix2);

Matrix<BigDecimal> expected = new Matrix<BigDecimal>(1, 1);
expected.set(0, 0, new BigDecimal(-1.1));

Matrix<BigDecimal> wrong1 = new Matrix<BigDecimal>(1, 1);
wrong1.set(0, 0, new BigDecimal(-1.05));

Matrix<BigDecimal> wrong2 = new Matrix<BigDecimal>(1, 1);
wrong2.set(0, 0, new BigDecimal(1.15));

BigDecimal diff = actual.get(0, 0).subtract(expected.get(0, 0)).abs();
assertTrue((diff.compareTo(new BigDecimal(0.00001)) < 0));
assertTrue(actual.get(0, 0).compareTo(wrong1.get(0, 0)) != 0);
assertTrue(actual.get(0, 0).compareTo(wrong2.get(0, 0)) != 0);
}
}