old_contents: """Tests for hw1 demo assignment."""
  
  assignment = {
    'name': 'hw1',
    'imports': ['from hw1 import *'],
    'src_files': ['hw1.py'],
    'version': '1.0',
  
    # Specify tests that should not be locked
    'no_lock': {
    },
  
    'tests': [
      # Test square
      {
        # The first name is the "official" name.
        'name': ['Q1', 'q1', '1'],
        # No explicit point value -- each test suite counts as 1 point
        'suites': [
          [
            {
              'type': 'code',     # Code question.
              'input': 'square(4)',
              'output': ['16'],   # List of outputs, even if only one
            },
            {
              'type': 'concept',  # Concept question.
              'input': """
              What type of input does the square function take?
              """,
              'output': [
                # Denote multiple choice with a list, rather than
                # a string.
                [
                  'number',         # Correct choice comes first.
                  'string',
                  'None',
                ]
              ],
            },
            {
              # If type is omitted, default type is 'code'.
              'input': """
              x = -5
              square(-5)
              """,
              # Last line in a multiline input is used as the prompt.
              'output': ['25'],
              # Additional statuses can be included here.
              'status': {
                'lock': False,
              }
            },
          ],
        ],
      },
      # Test double
      {
        'name': ['Q2', 'q2', '2'],
        # Point value specified -- points are partitioned evenly across
        # suites.
        'points': 4,
        'suites': [
          [
            {
              'input': 'double(4)',
              'output': ['8'],
            }
          ],
          [
            {
              # Cases with multiple outputs: lines with expected output
              # are denoted by '$ '.
              'input': """
              x = double(4)
              $ x
              $ double(x)
              """,
              'output': ['8', '16']
            },
            {
              'input': """
              x = double(2)
              $ x
              $ square(x)
              """,
              'output': ['4', '16'],
            },
          ],
        ],
      },
    ],
  }
  
new_contents: """Tests for hw1 demo assignment."""
  
  assignment = {
    'name': 'hw1',
    'imports': ['from hw1 import *'],
    'src_files': ['hw1.py'],
    'version': '1.0',
  }
  
  
subject: remove tests from hw1_tests.py because they are revised in another branch