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import pytest
from tests.common.impala_test_suite import ImpalaTestSuite

class TestInvalidTestHeader(ImpalaTestSuite):
  """Test correct handling of .test files with malformed header."""

  @classmethod
  def add_test_dimensions(cls):
    super(TestInvalidTestHeader, cls).add_test_dimensions()
    # It's sufficient to run this test once.
    cls.ImpalaTestMatrix.add_constraint(lambda v:\
        v.get_value('table_format').file_format == 'text' and\
        v.get_value('table_format').compression_codec == 'none')

  @classmethod
  def get_workload(cls):
    return 'functional-query'

  def test_invalid_test_header(self, vector):
    """Test that running a test file with an invalid header results in the right exception
    being thrown."""
    with pytest.raises(RuntimeError) as e:
      self.run_test_case('QueryTest/invalid_header', vector)
    assert 'Header must not start with' in str(e.value)