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package com.ugsbo.matrixcalc;
import static org.junit.Assert.assertArrayEquals; import static org.junit.Assert.assertFalse; import static org.junit.Assert.assertTrue;
import org.junit.Before; import org.junit.Test;
/** * Testet die Matrix Multiplication funkionalität */ public class MatrixMultiplicationTest {
private MatrixCalcMath matrixMath;
@Before public void setup() { matrixMath = new MatrixCalcMath(); }
@Test public void matrixAIsLinkedToMatrixBSouldBeTrue() { double[][] matrixA = new double[1][2]; double[][] matrixB = new double[2][1];
boolean result = matrixMath.checkIfMatriciesAreLinked(matrixA, matrixB);
assertTrue("Matrix A is Linked to B but it is not detected that way", result); }
@Test public void matrixAAndMatrixBAreNullSouldReturnFalse() { double[][] matrixA = null; double[][] matrixB = null;
boolean result = matrixMath.checkIfMatriciesAreLinked(matrixA, matrixB);
assertFalse("Matrix A and B are null but detected as Linked", result); }
@Test public void matrixAAndMatrixBAreNotLinkedSouldReturnFalse() { double[][] matrixA = new double[1][1]; double[][] matrixB = new double[2][1];
boolean result = matrixMath.checkIfMatriciesAreLinked(matrixA, matrixB);
assertFalse("Matrix A and B are not Linked but detected as Linked", result); }
@Test public void multiplyTwoMatriciesWithSameDimensionsAndSameContent() { double[][] matrixA = { { 1.0, 1.0 }, { 1.0, 1.0 } }; double[][] matrixB = { { 1.0, 1.0 }, { 1.0, 1.0 } }; double[][] matrixC = { { 2.0, 2.0 }, { 2.0, 2.0 } };
double[][] result = matrixMath.matrixMultiplication(matrixA, matrixB);
assertArrayEquals("The first row is not correct", matrixC[0], result[0], 0.1); assertArrayEquals("The second row is not correct", matrixC[1], result[1], 0.1); }
@Test public void multiplyTowMatriciesWithDiffrentDimensions() { // A(2,3) B(3,2) => C(2,2)
double[][] matrixA = { { 1.0, 1.0, 1.0 }, { 1.0, 1.0, 1.0 } }; double[][] matrixB = { { 1.0, 1.0 }, { 1.0, 1.0 }, { 1.0, 1.0 } }; double[][] matrixC = { { 3.0, 3.0 }, { 3.0, 3.0 } };
double[][] result = matrixMath.matrixMultiplication(matrixA, matrixB);
assertArrayEquals("The first row is not correct", matrixC[0], result[0], 0.1); assertArrayEquals("The second row is not correct", matrixC[1], result[1], 0.1); }
@Test public void multiplyTowMatriciesWithDiffrentDimensionsAndDiffentContent() { // A(2,3) B(3,2) => C(2,2)
double[][] matrixA = { { 1.0, 2.0, 3.0 }, { 4.0, 5.0, 6.0 } }; double[][] matrixB = { { 7.0, 8.0 }, { 9.0, 10.0 }, { 11.0, 12.0 } }; double[][] matrixC = { { 58.0, 64.0 }, { 139.0, 154.0 } };
double[][] result = matrixMath.matrixMultiplication(matrixA, matrixB);
assertArrayEquals("The first row is not correct", matrixC[0], result[0], 0.1); assertArrayEquals("The second row is not correct", matrixC[1], result[1], 0.1); }
@Test(expected = IllegalArgumentException.class)
public void tryToMultiplyTowEmptyMatricies() { // A(0,0) B(0,0) => IllegalArgumentException
double[][] matrixA = new double[0][0]; double[][] matrixB = new double[0][0];
matrixMath.matrixMultiplication(matrixA, matrixB); }
@Test(expected = IllegalArgumentException.class)
public void tryToMultiplyTowNullObjects() { // null null => IllegalArgumentException
double[][] matrixA = null; double[][] matrixB = null;
matrixMath.matrixMultiplication(matrixA, matrixB); } }
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