Bug 1422302 - Move mozbuild.controller.building.Footer to mozterm r=gps

This makes it a bit easier to share with other parts of the tree,
like test and linting.

MozReview-Commit-ID: 8Gzk8uOF5zK

python/mozterm/test/test_widgets.py

@@ -0,0 +1,49 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+from __future__ import absolute_import, unicode_literals
+
+from io import StringIO
+
+import mozunit
+import pytest
+
+from mozterm import Terminal
+from mozterm.widgets import Footer
+
+
+@pytest.fixture
+def terminal(monkeypatch):
+    blessings = pytest.importorskip('blessings')
+
+    kind = 'xterm-256color'
+    try:
+        term = Terminal(stream=StringIO(), force_styling=True, kind=kind)
+    except blessings.curses.error:
+        pytest.skip("terminal '{}' not found".format(kind))
+
+    # For some reason blessings returns None for width/height though a comment
+    # says that shouldn't ever happen.
+    monkeypatch.setattr(term, '_height_and_width', lambda: (100, 100))
+    return term
+
+
+def test_footer(terminal):
+    footer = Footer(terminal=terminal)
+    footer.write([
+        ('dim', 'foo'),
+        ('green', 'bar'),
+    ])
+    value = terminal.stream.getvalue()
+    expected = "\x1b7\x1b[2mfoo\x1b(B\x1b[m \x1b[32mbar\x1b(B\x1b[m\x1b8"
+    assert value == expected
+
+    footer.clear()
+    value = terminal.stream.getvalue()[len(value):]
+    expected = "\x1b[1G\x1b[K"
+    assert value == expected
+
+
+if __name__ == '__main__':
+    mozunit.main()