1 files changed, 93 insertions, 0 deletions
diff --git a/test/test_progressive.py b/test/test_progressive.py
new file mode 100644
index 0000000..805291b
--- /dev/null
+++ b/test/test_progressive.py
@@ -0,0 +1,93 @@
+"""Test for the --progressive mode."""
+from __future__ import annotations
+
+import json
+import subprocess
+import sys
+from pathlib import Path
+
+from ansiblelint.constants import GIT_CMD
+from ansiblelint.file_utils import cwd
+
+FAULTY_PLAYBOOK = """---
+- name: faulty
+  hosts: localhost
+  tasks:
+    - name: hello
+      debug:
+        msg: world
+"""
+
+CORRECT_PLAYBOOK = """---
+- name: Correct
+  hosts: localhost
+  tasks:
+    - name: Hello
+      ansible.builtin.debug:
+        msg: world
+"""
+
+
+def git_init() -> None:
+    """Init temporary git repository."""
+    subprocess.run([*GIT_CMD, "init", "--initial-branch=main"], check=True)
+    subprocess.run([*GIT_CMD, "config", "user.email", "test@example.com"], check=True)
+    subprocess.run([*GIT_CMD, "config", "user.name", "test"], check=True)
+
+
+def git_commit(filename: Path, content: str) -> None:
+    """Create and commit a file."""
+    filename.write_text(content)
+    subprocess.run([*GIT_CMD, "add", filename], check=True)
+    subprocess.run(
+        [
+            *GIT_CMD,
+            "commit",
+            "--no-gpg-sign",
+            "-a",
+            "-m",
+            f"Commit {filename}",
+        ],
+        check=True,
+    )
+
+
+def run_lint(cmd: list[str]) -> subprocess.CompletedProcess[str]:
+    """Run ansible-lint."""
+    # pylint: disable=subprocess-run-check
+    return subprocess.run(
+        cmd,
+        capture_output=True,
+        text=True,
+    )
+
+
+def test_validate_progressive_mode_json_output(tmp_path: Path) -> None:
+    """Test that covers the following scenarios for progressive mode.
+
+    1. JSON output is valid in quiet and verbose modes
+    2. New files are correctly handled whether lintable paths are passed or not
+    3. Regression is not reported when the last commit doesn't add any new violations
+    """
+    cmd = [
+        sys.executable,
+        "-m",
+        "ansiblelint",
+        "--progressive",
+        "-f",
+        "json",
+    ]
+    with cwd(tmp_path):
+        git_init()
+        git_commit(tmp_path / "README.md", "pytest")
+        git_commit(tmp_path / "playbook-faulty.yml", FAULTY_PLAYBOOK)
+        cmd.append("-q")
+        res = run_lint(cmd)
+        assert res.returncode == 2
+        json.loads(res.stdout)
+
+        git_commit(tmp_path / "playbook-correct.yml", CORRECT_PLAYBOOK)
+        cmd.extend(["-vv", "playbook-correct.yml"])
+        res = run_lint(cmd)
+        assert res.returncode == 0
+        json.loads(res.stdout)