[meld] test: Add new test for gutter change action classification

[Kai Willadsen <kaiw src gnome org>]

commit 714d02c41296ed6819a32cb2234c151074a64b6e
Author: Kai Willadsen <kai willadsen gmail com>
Date:   Mon Oct 3 07:55:13 2016 +1000

    test: Add new test for gutter change action classification

 test/test_gutterrendererchunk.py |   69 ++++++++++++++++++++++++++++++++++++++
 1 files changed, 69 insertions(+), 0 deletions(-)
---
diff --git a/test/test_gutterrendererchunk.py b/test/test_gutterrendererchunk.py
new file mode 100644
index 0000000..02d8ace
--- /dev/null
+++ b/test/test_gutterrendererchunk.py
@@ -0,0 +1,69 @@
+
+import mock
+import pytest
+
+import meld.gutterrendererchunk
+from meld.gutterrendererchunk import GutterRendererChunkAction
+from meld.const import MODE_REPLACE, MODE_DELETE, MODE_INSERT
+from meld.matchers import DiffChunk
+
+
+def make_chunk(chunk_type):
+    return DiffChunk(chunk_type, 0, 1, 0, 1)
+
+
+@pytest.mark.parametrize("mode, editable, chunk, expected_action", [
+    # Replace mode with replace chunks
+    (MODE_REPLACE, (True, True), make_chunk('replace'), MODE_REPLACE),
+    (MODE_REPLACE, (True, False), make_chunk('replace'), MODE_DELETE),
+    (MODE_REPLACE, (False, True), make_chunk('replace'), MODE_REPLACE),
+    (MODE_REPLACE, (False, False), make_chunk('replace'), None),
+    # Replace mode with delete chunks
+    (MODE_REPLACE, (True, True), make_chunk('delete'), MODE_REPLACE),
+    (MODE_REPLACE, (True, False), make_chunk('delete'), MODE_DELETE),
+    (MODE_REPLACE, (False, True), make_chunk('delete'), MODE_REPLACE),
+    (MODE_REPLACE, (False, False), make_chunk('delete'), None),
+    # Delete mode makes a slightly weird choice to remove non-delete
+    # actions while in delete mode; insert mode makes the opposite
+    # choice
+    #
+    # Delete mode with replace chunks
+    (MODE_DELETE, (True, True), make_chunk('replace'), MODE_DELETE),
+    (MODE_DELETE, (True, False), make_chunk('replace'), MODE_DELETE),
+    (MODE_DELETE, (False, True), make_chunk('replace'), None),
+    (MODE_DELETE, (False, False), make_chunk('replace'), None),
+    # Delete mode with delete chunks
+    (MODE_DELETE, (True, True), make_chunk('delete'), MODE_DELETE),
+    (MODE_DELETE, (True, False), make_chunk('delete'), MODE_DELETE),
+    (MODE_DELETE, (False, True), make_chunk('delete'), None),
+    (MODE_DELETE, (False, False), make_chunk('delete'), None),
+    # Insert mode with replace chunks
+    (MODE_INSERT, (True, True), make_chunk('replace'), MODE_INSERT),
+    (MODE_INSERT, (True, False), make_chunk('replace'), MODE_DELETE),
+    (MODE_INSERT, (False, True), make_chunk('replace'), MODE_INSERT),
+    (MODE_INSERT, (False, False), make_chunk('replace'), None),
+    # Insert mode with delete chunks
+    (MODE_INSERT, (True, True), make_chunk('delete'), MODE_REPLACE),
+    (MODE_INSERT, (True, False), make_chunk('delete'), MODE_DELETE),
+    (MODE_INSERT, (False, True), make_chunk('delete'), MODE_REPLACE),
+    (MODE_INSERT, (False, False), make_chunk('delete'), None),
+    # We should never have insert chunks here
+    (MODE_REPLACE, (True, True), make_chunk('insert'), None),
+    (MODE_REPLACE, (True, False), make_chunk('insert'), None),
+    (MODE_REPLACE, (False, True), make_chunk('insert'), None),
+    (MODE_REPLACE, (False, False), make_chunk('insert'), None),
+
+    # TODO: Add tests for conflict chunks
+])
+def test_classify_change_actions(mode, editable, chunk, expected_action):
+    filediff = mock.MagicMock()
+    meld.gutterrendererchunk.meldsettings = mock.MagicMock(style_scheme=None)
+    GutterRendererChunkAction.on_setting_changed = mock.MagicMock()
+    renderer = GutterRendererChunkAction(
+        0, 1, mock.MagicMock(), filediff, None)
+
+    renderer.mode = mode
+    renderer.views_editable = editable
+    action = renderer._classify_change_actions(chunk)
+
+    assert action == expected_action