old_contents: from . import IpynbTest, RmdTest
  
  
  rmd_basic = """markdown-0-0
  markdown-0-1
  
  ```{r}
  code-1
  ```
  
  markdown-2-0
  markdown-2-1
  
  ```{r}
  code-3-0
  code-3-1
  code-3-2
  ```"""
  class TestRmdBasic(RmdTest):
      source = rmd_basic
      def test_basic_ipynb(self):
          cells = self.ipynb.cells
          self.assertEqual(len(cells), 4)
          self.assertEqual(cells[0].cell_type, "markdown")
          self.assertIn("markdown-0-0\nmarkdown-0-1", cells[0].source)
          self.assertEqual(cells[1].cell_type, "code")
          self.assertIn("code-1", cells[1].source)
          self.assertEqual(cells[2].cell_type, "markdown")
          self.assertIn("markdown-2-0\nmarkdown-2-1", cells[2].source)
          self.assertEqual(cells[3].cell_type, "code")
          self.assertIn("code-3-0\ncode-3-1\ncode-3-2", cells[3].source)
  
      def test_basic_rmd(self):
          self.assertEqual(self.roundtrip, self.source)
  
  spin_basic = """#' markdown-0-0
  #' markdown-0-1
  
  code-1
  
  #' markdown-2-0
  #' markdown-2-1
  
  code-3-0
  code-3-1
  code-3-2
  """
  class TestSpinBasic(TestRmdBasic):
      source = spin_basic
      use_rmd = False
  
  class TestIpynbBasic(IpynbTest):
      cells = [
          dict(cell_type="markdown", metadata={}, source="markdown-0-0\nmarkdown-0-1\n"),
          dict(cell_type="code", execution_count=0, metadata={}, outputs=[], source="code-1"),
          dict(cell_type="markdown", metadata={}, source=["markdown-2-0\n", "markdown-2-1\n", "\n"]),
          dict(cell_type="code", execution_count=0, metadata={}, outputs=[], source=["code-3-0\ncode-3-1\n", "code-3-2"]),
      ]
      def test_basic_rmd(self):
          self.assertEqual(self.rmd, rmd_basic)
  
      def test_basic_ipynb(self):
          self.assertEqual(len(self.roundtrip.cells), len(self.cells))
  
new_contents: from . import IpynbTest, RmdTest
  
  
  rmd_basic = """markdown-0-0
  markdown-0-1
  
  ```{r}
  code-1
  ```
  
  markdown-2-0
  markdown-2-1
  
  ```{r}
  code-3-0
  code-3-1
  code-3-2
  ```"""
  class TestRmdBasic(RmdTest):
      source = rmd_basic
      def test_basic_ipynb(self):
          cells = self.ipynb.cells
          self.assertEqual(len(cells), 4)
          self.assertEqual(cells[0].cell_type, "markdown")
          self.assertIn("markdown-0-0\nmarkdown-0-1", cells[0].source)
          self.assertEqual(cells[1].cell_type, "code")
          self.assertIn("code-1", cells[1].source)
          self.assertEqual(cells[2].cell_type, "markdown")
          self.assertIn("markdown-2-0\nmarkdown-2-1", cells[2].source)
          self.assertEqual(cells[3].cell_type, "code")
          self.assertIn("code-3-0\ncode-3-1\ncode-3-2", cells[3].source)
  
      def test_basic_rmd(self):
          self.assertEqual(self.roundtrip, self.source)
  
  spin_basic = """#' markdown-0-0
  #' markdown-0-1
  
  code-1
  
  #' markdown-2-0
  #' markdown-2-1
  
  code-3-0
  code-3-1
  code-3-2
  """
  class TestSpinBasic(TestRmdBasic):
      source = spin_basic
      use_rmd = False
  
  class TestIpynbBasic(IpynbTest):
      cells = [
          dict(cell_type="markdown", metadata={}, source="markdown-0-0\nmarkdown-0-1\n"),
          dict(cell_type="code", execution_count=0, metadata={}, outputs=[], source="code-1"),
          dict(cell_type="markdown", metadata={}, source=["markdown-2-0\n", "markdown-2-1\n", "\n"]),
          dict(cell_type="code", execution_count=0, metadata={}, outputs=[], source=["code-3-0\ncode-3-1\n", "code-3-2"]),
      ]
      def test_basic_rmd(self):
          self.assertEqual(self.rmd, rmd_basic)
  
      def test_basic_ipynb(self):
          self.assertEqual(len(self.roundtrip.cells), len(self.cells))
  
  rmd_repeat = """markdown-0
  ```{r}
  code-1
  ```
  
  ```{r}
  code-2
  ```
  ```{r}
  code-3
  ```"""
  class TestRmdRepeat(RmdTest):
      source = rmd_repeat
      def test_repeated_rmd(self):
          cells = self.ipynb.cells
          self.assertEqual(len(cells), 4)
          self.assertEqual(cells[0].cell_type, "markdown")
          self.assertEqual(cells[1].cell_type, "code")
          self.assertEqual(cells[2].cell_type, "code")
          self.assertEqual(cells[3].cell_type, "code")
          self.assertIn("markdown-0", cells[0].source)
          self.assertIn("code-1", cells[1].source)
          self.assertIn("code-2", cells[2].source)
          self.assertIn("code-3", cells[3].source)
  
subject: Add a test for repeated rmd cells without interspersed markdown