test: set branch name for metadata tests

Explicitly set the initial branch name for git repos created when
testing metadata. Without this, the user's git config may cause test
failures.

Author: apotterri

appmap/test/conftest.py

@@ -77,7 +77,7 @@ def git_directory_fixture(tmp_path_factory):
     (git_dir / "new_file").write_text("new_file")
 
     git = utils.git(cwd=git_dir)
-    git("init")
+    git("init --initial-branch main")
     git("config --local user.email test@test")
     git("config --local user.name Test")
     git("add README.metadata")

appmap/test/test_metadata.py

@@ -23,7 +23,7 @@ def test_git_metadata(git):
     assert git_md == DictIncluding(
         {
             "repository": "https://www.example.test/repo.git",
-            "branch": "master",
+            "branch": "main",
             "status": ["?? new_file"],
         }
     )
@@ -55,7 +55,7 @@ def test_tags(git):
     assert git_md == DictIncluding(
         {
             "repository": "https://www.example.test/repo.git",
-            "branch": "master",
+            "branch": "main",
             "tag": tag,
             "annotated_tag": atag,
             "commits_since_tag": 1,