TST : first round of tests for Cycler

Covers everything but the repr Tests '+' behavior which may be changed.
matplotlib · tacaswell · Mar 21, 2015 · Mar 21, 2015 · Mar 22, 2015 · Mar 22, 2015
commit d5ec6d8cef088b0e56a3e3face01f280ad14bd26
diff --git a/lib/matplotlib/tests/test_cycler.py b/lib/matplotlib/tests/test_cycler.py
@@ -0,0 +1,83 @@
+from __future__ import (absolute_import, division, print_function,
+                        unicode_literals)
+
+import six
+from six.moves import zip
+from matplotlib.cycler import cycler
+from nose.tools import assert_equal, assert_raises
+from itertools import product
+from operator import add, iadd, mul, imul
+
+
+def _cycler_helper(c, length, keys, values):
+    assert_equal(len(c), length)
+    assert_equal(len(c), len(list(c.finite_iter())))
+    assert_equal(len(c), len(c.to_list()))
+    assert_equal(c.keys, set(keys))
+
+    for k, vals in zip(keys, values):
+        for v, v_target in zip(c, vals):
+            assert_equal(v[k], v_target)
+
+
+def test_creation():
+    c = cycler('c', 'rgb')
+    yield _cycler_helper, c, 3, ['c'], [['r', 'g', 'b']]
+    c = cycler('c', list('rgb'))
+    yield _cycler_helper, c, 3, ['c'], [['r', 'g', 'b']]
+
+
+def test_compose():
+    c1 = cycler('c', 'rgb')
+    c2 = cycler('lw', range(3))
+    c3 = cycler('lw', range(15))
+    # addition
+    yield _cycler_helper, c1+c2, 3, ['c', 'lw'], [list('rgb'), range(3)]
+    yield _cycler_helper, c2+c1, 3, ['c', 'lw'], [list('rgb'), range(3)]
+    # miss-matched add lengths
+    yield _cycler_helper, c1+c3, 3, ['c', 'lw'], [list('rgb'), range(3)]
+    yield _cycler_helper, c3+c1, 3, ['c', 'lw'], [list('rgb'), range(3)]
+
+    # multiplication
+    target = zip(*product(list('rgb'), range(3)))
+    yield (_cycler_helper, c1 * c2, 9, ['c', 'lw'], target)
+
+    target = zip(*product(range(3), list('rgb')))
+    yield (_cycler_helper, c2 * c1, 9, ['lw', 'c'], target)
+
+    target = zip(*product(range(15), list('rgb')))
+    yield (_cycler_helper, c3 * c1, 45, ['lw', 'c'], target)
+
+
+def test_inplace():
+    c1 = cycler('c', 'rgb')
+    c2 = cycler('lw', range(3))
+    c2 += c1
+    yield _cycler_helper, c2, 3, ['c', 'lw'], [list('rgb'), range(3)]
+
+    c3 = cycler('c', 'rgb')
+    c4 = cycler('lw', range(3))
+    c3 *= c4
+    target = zip(*product(list('rgb'), range(3)))
+    yield (_cycler_helper, c3, 9, ['c', 'lw'], target)
+
+
+def test_constructor():
+    c1 = cycler('c', 'rgb')
+    c2 = cycler('ec', c1)
+    yield _cycler_helper, c1+c2, 3, ['c', 'ec'], [['r', 'g', 'b']]*2
+    c3 = cycler('c', c1)
+    yield _cycler_helper, c3+c2, 3, ['c', 'ec'], [['r', 'g', 'b']]*2
+
+
+def test_failures():
+    c1 = cycler('c', 'rgb')
+    c2 = cycler('c', c1)
+    assert_raises(ValueError, add, c1, c2)
+    assert_raises(ValueError, iadd, c1, c2)
+    assert_raises(ValueError, mul, c1, c2)
+    assert_raises(ValueError, imul, c1, c2)
+
+    c3 = cycler('ec', c1)
+
+    assert_raises(ValueError, cycler, 'c', c2 + c3)