Tools/Scripts/webkitpy/layout_tests/layout_package/metered_stream_unittest.py

#!/usr/bin/python
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"""Unit tests for metered_stream.py."""

import os
import optparse
import pdb
import sys
import unittest

from webkitpy.common.array_stream import ArrayStream
from webkitpy.layout_tests.layout_package import metered_stream


class TestMeteredStream(unittest.TestCase):
    def test_regular(self):
        a = ArrayStream()
        m = metered_stream.MeteredStream(verbose=False, stream=a)
        self.assertTrue(a.empty())

        # basic test - note that the flush() is a no-op, but we include it
        # for coverage.
        m.write("foo")
        m.flush()
        exp = ['foo']
        self.assertEquals(a.get(), exp)

        # now check that a second write() does not overwrite the first.
        m.write("bar")
        exp.append('bar')
        self.assertEquals(a.get(), exp)

        m.update("batter")
        exp.append('batter')
        self.assertEquals(a.get(), exp)

        # The next update() should overwrite the laste update() but not the
        # other text. Note that the cursor is effectively positioned at the
        # end of 'foo', even though we had to erase three more characters.
        m.update("foo")
        exp.append('\b\b\b\b\b\b      \b\b\b\b\b\b')
        exp.append('foo')
        self.assertEquals(a.get(), exp)

        m.progress("progress")
        exp.append('\b\b\b   \b\b\b')
        exp.append('progress')
        self.assertEquals(a.get(), exp)

        # now check that a write() does overwrite the progress bar
        m.write("foo")
        exp.append('\b\b\b\b\b\b\b\b        \b\b\b\b\b\b\b\b')
        exp.append('foo')
        self.assertEquals(a.get(), exp)

        # Now test that we only back up to the most recent newline.

        # Note also that we do not back up to erase the most recent write(),
        # i.e., write()s do not get erased.
        a.reset()
        m.update("foo\nbar")
        m.update("baz")
        self.assertEquals(a.get(), ['foo\nbar', '\b\b\b   \b\b\b', 'baz'])

    def test_verbose(self):
        a = ArrayStream()
        m = metered_stream.MeteredStream(verbose=True, stream=a)
        self.assertTrue(a.empty())
        m.write("foo")
        self.assertEquals(a.get(), ['foo'])

        import logging
        b = ArrayStream()
        logger = logging.getLogger()
        handler = logging.StreamHandler(b)
        logger.addHandler(handler)
        m.update("bar")
        logger.handlers.remove(handler)
        self.assertEquals(a.get(), ['foo'])
        self.assertEquals(b.get(), ['bar\n'])

        m.progress("dropped")
        self.assertEquals(a.get(), ['foo'])
        self.assertEquals(b.get(), ['bar\n'])


if __name__ == '__main__':
    unittest.main()