adding tests for the video module

tests/test_video.py

@@ -0,0 +1,56 @@
+# -*- coding:utf-8 -*-
+
+from __future__ import division
+
+import os
+import filecmp
+import pytest
+
+from sigal import init_logging
+from sigal.video import vid_size, generate_video
+
+CURRENT_DIR = os.path.dirname(__file__)
+TEST_VIDEO = 'stallman-software-freedom-day-low.ogv'
+SRCFILE = os.path.join(CURRENT_DIR, 'sample', 'pictures', 'video', TEST_VIDEO)
+
+
+
+def test_generate_video_fit_height(tmpdir):
+    """largest fitting dimension is height"""
+
+    base, ext = os.path.splitext(TEST_VIDEO)
+    dstfile = str(tmpdir.join(base + '.webm'))
+    generate_video(SRCFILE, dstfile, (50, 100))
+
+    size_src = vid_size(SRCFILE)
+    size_dst = vid_size(dstfile)
+
+    assert size_dst[0] == 50
+    # less than 2% error on ratio
+    assert abs(size_dst[0]/size_dst[1] - size_src[0]/size_src[1]) < 2e-2
+
+def test_generate_video_fit_width(tmpdir):
+    """largest fitting dimension is width"""
+
+    base, ext = os.path.splitext(TEST_VIDEO)
+    dstfile = str(tmpdir.join(base + '.webm'))
+    generate_video(SRCFILE, dstfile, (100, 50))
+
+    size_src = vid_size(SRCFILE)
+    size_dst = vid_size(dstfile)
+
+    assert size_dst[1] == 50
+    # less than 2% error on ratio
+    assert abs(size_dst[0]/size_dst[1] - size_src[0]/size_src[1]) < 2e-2
+
+def test_generate_video_dont_enlarge(tmpdir):
+    """video dimensions should not be enlarged"""
+
+    base, ext = os.path.splitext(TEST_VIDEO)
+    dstfile = str(tmpdir.join(base + '.webm'))
+    generate_video(SRCFILE, dstfile, (1000, 1000))
+
+    size_src = vid_size(SRCFILE)
+    size_dst = vid_size(dstfile)
+
+    assert size_src == size_dst