chore: add and fix post-checkout hook tests

tests/commands/run_test.py

@@ -864,7 +864,7 @@ def test_commit_msg_hook(cap_out, store, commit_msg_repo):
     )
 
 
-def test_post_checkout_hook(cap_out, store, tempdir_factory):
+def test_post_checkout_hook_run(cap_out, store, tempdir_factory):
     path = git_dir(tempdir_factory)
     config = {
         'repo': 'meta', 'hooks': [
@@ -878,12 +878,31 @@ def test_post_checkout_hook(cap_out, store, tempdir_factory):
             cap_out,
             store,
             path,
-            {'hook_stage': 'post-checkout'},
+            {'hook_stage': 'post-checkout', 'from_ref': 'a', 'to_ref': 'b', 'checkout_type': '1'},
             expected_outputs=[b'identity...'],
             expected_ret=0,
             stage=False,
         )
 
+def test_post_checkout_hook_skip(cap_out, store, tempdir_factory):
+    path = git_dir(tempdir_factory)
+    config = {
+        'repo': 'meta', 'hooks': [
+            {'id': 'identity', 'stages': ['post-checkout']},
+        ],
+    }
+    add_config_to_repo(path, config)
+
+    with cwd(path):
+        _test_run(
+            cap_out,
+            store,
+            path,
+            {'hook_stage': 'post-checkout', 'from_ref': 'a', 'to_ref': 'a'},
+            expected_outputs=[b"Skipping `post-checkout` hooks since it's a file checkout or same head ref"],
+            expected_ret=0,
+            stage=False,
+        )
 
 def test_prepare_commit_msg_hook(cap_out, store, prepare_commit_msg_repo):
     filename = '.git/COMMIT_EDITMSG'