old_contents: import pytest
  
  import pikepdf
  from pikepdf.models import PdfMatrix
  
  
  def test_init_6():
      m = PdfMatrix(1, 0, 0, 1, 0, 0)
      m2 = m.scaled(2, 2)
      m2t = m2.translated(2, 3)
      assert (
          repr(m2t)
          == 'pikepdf.Matrix(((2.0, 0.0, 0.0), (0.0, 2.0, 0.0), (2.0, 3.0, 1.0)))'
      )
  
  
  def test_invalid_init():
      with pytest.raises(ValueError, match='arguments'):
          PdfMatrix('strings')
  
  
  def test_matrix_from_matrix():
      m = PdfMatrix(1, 0, 0, 1, 0, 0)
      m_copy = PdfMatrix(m)
      assert m == m_copy
      assert m != 'not matrix'
  
new_contents: from math import isclose
  
  import pytest
  
  import pikepdf
  from pikepdf.models import PdfMatrix
  
  
  def test_init_6():
      m = PdfMatrix(1, 0, 0, 1, 0, 0)
      m2 = m.scaled(2, 2)
      m2t = m2.translated(2, 3)
      assert (
          repr(m2t)
          == 'pikepdf.Matrix(((2.0, 0.0, 0.0), (0.0, 2.0, 0.0), (2.0, 3.0, 1.0)))'
      )
      m2tr = m2t.rotated(90)
      assert isclose(m2tr.a, 0, abs_tol=1e-6)
      assert isclose(m2tr.b, 2, abs_tol=1e-6)
      assert isclose(m2tr.c, -2, abs_tol=1e-6)
      assert isclose(m2tr.d, 0, abs_tol=1e-6)
      assert isclose(m2tr.e, -3, abs_tol=1e-6)
      assert isclose(m2tr.f, 2, abs_tol=1e-6)
  
  
  def test_invalid_init():
      with pytest.raises(ValueError, match='arguments'):
          PdfMatrix('strings')
  
  
  def test_matrix_from_matrix():
      m = PdfMatrix(1, 0, 0, 1, 0, 0)
      m_copy = PdfMatrix(m)
      assert m == m_copy
      assert m != 'not matrix'
  
  
  def test_matrix_encode():
      m = PdfMatrix(1, 0, 0, 1, 0, 0)
      assert m.encode() == b'1.000000 0.000000 0.000000 1.000000 0.000000 0.000000'
  
subject: cover matrix.py