public void Matrix_AbsoluteValueOfMatrixTest() { Matrix matrix1 = new Matrix(3,3); double[] matrix1Column1 = { -1, 5, 6 }; double[] matrix1Column2 = { 2, -4, 7 }; double[] matrix1Column3 = { 3, 6, -8 }; matrix1.SetColumn(0, matrix1Column1); matrix1.SetColumn(1, matrix1Column2); matrix1.SetColumn(2, matrix1Column3); Matrix expectedResult = new Matrix(3,3); double[] expectedResultColumn1 = { 1, 5, 6 }; double[] expectedResultColumn2 = { 2, 4, 7 }; double[] expectedResultColumn3 = { 3, 6, 8 }; expectedResult.SetColumn(0, expectedResultColumn1); expectedResult.SetColumn(1, expectedResultColumn2); expectedResult.SetColumn(2, expectedResultColumn3); Matrix actualResult = matrix1.AbsoluteValue(); bool equalityResult = (actualResult == expectedResult); equalityResult.Should().BeTrue(); }