Add test for commit message via stdin

test/test_commit.py

@@ -32,3 +32,37 @@ def test_commit(xtl_clone, commit_env_config, git2cpp_path, tmp_path, all_flag):
     )
     assert p_status_2.returncode == 0
     assert "mook_file" not in p_status_2.stdout
+
+
+@pytest.mark.parametrize("commit_msg", ["Added file", ""])
+def test_commit_message_via_stdin(commit_env_config, git2cpp_path, tmp_path, run_in_tmp_path, commit_msg):
+    cmd = [git2cpp_path, "init", "."]
+    p_init = subprocess.run(cmd)
+    assert p_init.returncode == 0
+
+    (tmp_path / "file.txt").write_text("Some text")
+
+    cmd_add = [git2cpp_path, "add", "file.txt"]
+    p_add = subprocess.run(cmd_add)
+    assert p_add.returncode == 0
+
+    cmd_commit = [git2cpp_path, "commit"]
+    p_commit = subprocess.run(cmd_commit, text=True, capture_output=True, input=commit_msg)
+
+    if commit_msg == "":
+        # No commit message
+        assert p_commit.returncode != 0
+        assert "Aborting, no commit message specified" in p_commit.stderr
+    else:
+        # Valid commit message
+        assert p_commit.returncode == 0
+
+        cmd_log = [git2cpp_path, "log"]
+        p_log = subprocess.run(cmd_log, text=True, capture_output=True)
+        assert p_log.returncode == 0
+        lines = p_log.stdout.splitlines()
+
+        assert "commit" in lines[0]
+        assert "Author:" in lines[1]
+        assert "Date" in lines[2]
+        assert commit_msg in lines[4]