DeterminantOfMatrixTest.java

packagecom.thealgorithms.maths;

importstaticorg.junit.jupiter.api.Assertions.assertEquals;

importorg.junit.jupiter.api.Test;

publicclassDeterminantOfMatrixTest {

@Test
publicvoidtestDeterminant2x2Matrix() {
int[][] matrix = {{1, 2}, {3, 4}};
intexpected = -2;
assertEquals(expected, DeterminantOfMatrix.determinant(matrix, 2));
 }

@Test
publicvoidtestDeterminant3x3Matrix() {
int[][] matrix = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}};
intexpected = 0;
assertEquals(expected, DeterminantOfMatrix.determinant(matrix, 3));
 }

@Test
publicvoidtestDeterminant3x3MatrixNonZero() {
int[][] matrix = {{1, 2, 3}, {0, 1, 4}, {5, 6, 0}};
intexpected = 1;
assertEquals(expected, DeterminantOfMatrix.determinant(matrix, 3));
 }

@Test
publicvoidtestDeterminant1x1Matrix() {
int[][] matrix = {{7}};
intexpected = 7;
assertEquals(expected, DeterminantOfMatrix.determinant(matrix, 1));
 }

@Test
publicvoidtestDeterminant4x4Matrix() {
int[][] matrix = {{1, 0, 0, 1}, {0, 1, 0, 0}, {0, 0, 1, 0}, {1, 0, 0, 1}};
intexpected = 0;
assertEquals(expected, DeterminantOfMatrix.determinant(matrix, 4));
 }

@Test
publicvoidtestDeterminant4x4MatrixZero() {
int[][] matrix = {{1, 2, 3, 4}, {5, 6, 7, 8}, {9, 10, 11, 12}, {13, 14, 15, 16}};
intexpected = 0;
assertEquals(expected, DeterminantOfMatrix.determinant(matrix, 4));
 }
}