def testIdentity(self):
"""
The static identity method should return a 3 x 3
identity matrix, unless a different number of rows and columns
are specified
"""
self.assertEqual(Matrix.identity(), self.identity)
def testConstructor(self):
"""
A new Matrix instance should be a 3 x 3 by default,
unless a different number of rows and columns are specified.
The matrix should be the zero matrix.
"""
with self.assertRaises(TypeError):
badArguments = Matrix(2.5, 'foo')
matrix1 = Matrix()
self.assertEqual(matrix1.identity(), self.identity)
matrix2 = Matrix(4,2)
self.assertEqual(matrix2.rows(), 4)
self.assertEqual(matrix2.columns(), 2)