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package com.ugsbo.matrixcalc;
import static org.junit.Assert.assertEquals;
import org.junit.Before; import org.junit.Test;
/** * Tests the funktionality to Calculate the Determinant of a Matrix. */ public class MatrixCalcDeterminatTest {
private MatrixCalcMath matrixMath;
@Before public void setup() { matrixMath = new MatrixCalcMath(); }
@Test public void CalculatesTheDeterminanteOfA2by2Matrix() { // A(2,2)
double[][] matrixA = { { 1.0, 2.0 }, { 3.0, 4.0 } }; double determinat = -2.0; double delta = 0.01;
double result = matrixMath.calcDeterminat(matrixA);
assertEquals("The Determinant is not as it should be", determinat, result, delta); }
@Test public void CalculatesTheDeterminanteOfA3by3Matrix() { // A(3,3)
double[][] matrixA = { { 1.0, 2.0, 1.0 }, { 3.0, 4.0, 0.0 }, { 5.0, 6.0, 0.0 } }; double determinat = -2.0; double delta = 0.01;
double result = matrixMath.calcDeterminat(matrixA);
assertEquals("The Determinant is not as it should be", determinat, result, delta);
}
@Test(expected = IllegalArgumentException.class) public void tryToCalculateA4by4Matrix_ShouldResulInIllegalArgumentException() { // A(4,4)
double[][] matrixA = { { 1.0, 2.0, 1.0, 0.0 }, { 3.0, 4.0, 0.0, 0.0 }, { 5.0, 6.0, 0.0, 0.0 }, { 5.0, 6.0, 0.0, 0.0 } };
matrixMath.calcDeterminat(matrixA); }
@Test(expected = IllegalArgumentException.class) public void tryToCalculateANonQuadraticMatrix_SouldResulInIllegalArgumentException() { // A(2,4)
double[][] matrixA = { { 5.0, 6.0, 0.0, 0.0 }, { 5.0, 6.0, 0.0, 0.0 } };
matrixMath.calcDeterminat(matrixA); } }
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