Only use pygit2's blame via opt-in

This can be reconsidered if pygit2's blame algorithm improves.
The option can still be useful if the 'git' command is not available
on the system.

1 files changed, 24 insertions, 0 deletions

diff --git a/tests/test_blame.py b/tests/test_blame.py
new file mode 100644
index 0000000..410e7de
--- /dev/null
+++ b/tests/test_blame.py
@@ -0,0 +1,24 @@
+
+from git_deps.blame import blame_via_subprocess, BlameHunk, GitRef
+
+def test_blame_via_subprocess():
+    hunks = list(blame_via_subprocess(
+        'INSTALL.md',
+        '04f5c095d4eccf5808db6dbf90c31a535f7f371c',
+        12, 4))
+
+    expected_hunks = [
+        BlameHunk(
+            GitRef('6e23a48f888a355ad7e101c797ce1b66c4b7b86a'),
+            orig_start_line_number=12,
+            final_start_line_number=12,
+            lines_in_hunk=2),
+        BlameHunk(
+            GitRef('2c9d23b0291157eb1096384ff76e0122747b9bdf'),
+            orig_start_line_number=10,
+            final_start_line_number=14,
+            lines_in_hunk=2)
+    ]
+
+    assert hunks == expected_hunks
+