DiagonalMatrixTest.java

package test.model;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;

import java.util.Arrays;

import main.java.model.*;

import org.junit.Test;

public class DiagonalMatrixTest {

  @Test
  // Checks to see if a Diagonal Matrix is created properly
  public void testDiagonalMatrixCreation() {
    double[] data = {1, 3, 6, 9, 3};
    double[][] resultData =
        { {1.0, 0.0, 0.0, 0.0, 0.0}, {0.0, 3.0, 0.0, 0.0, 0.0}, {0.0, 0.0, 6.0, 0.0, 0.0},
            {0.0, 0.0, 0.0, 9.0, 0.0}, {0.0, 0.0, 0.0, 0.0, 3.0}};

    final Matrix testMatrix = new DiagonalMatrix("Test", data, null);
    assertEquals("Created matrix has inaccurate number of rows", testMatrix.getNumRows(), 5);
    assertEquals("Created matrix has inaccurate number of columns", testMatrix.getNumCols(), 5);
    assertTrue("Created matrix has inaccurate data",
        Arrays.deepEquals(testMatrix.getData(), resultData));
  }

  @Test
  // Checks to see if a Diagonal Matrix is created properly
  public void testDiagonalMatrixDeterminant() {
    double[] data = {1, 3, 6, 9, 3};
    double resultData = 486;

    final DiagonalMatrix testMatrix = new DiagonalMatrix("Test", data, null);
    assertTrue("Determinant calculation gives incorrect result.",
        testMatrix.determinant() == resultData);
  }
  
  @Test
  // Checks to see if a Diagonal Matrix is created properly
  public void testDiagonalMatrixScalarMult() {
    double[] data = {1, 3, 6, 9, -3};
    double[][] resultData = {{-100.2,0,0,0,0},{0,-300.6,0,0,0},{0,0,-601.2,0,0},{0,0,0,-901.8,0},{0,0,0,0,300.6}};

    final DiagonalMatrix testMatrix = new DiagonalMatrix("Test", data, null);
    assertTrue("Scalar multiplication calculation gives incorrect result.",
        Arrays.deepEquals(testMatrix.multiplyScalar(-100.2).normalise().getData(), resultData));
  }

}