--metadata accepts YAML as well as JSON - closes #713

tests/test_cli.py

@@ -1,8 +1,10 @@
-from .fixtures import app_client, make_app_client
-from datasette.cli import cli
+from .fixtures import app_client, make_app_client, TestClient as _TestClient
+from datasette.cli import cli, serve
 from click.testing import CliRunner
-import pathlib
+import io
 import json
+import pathlib
+import textwrap
 
 
 def test_inspect_cli(app_client):
@@ -46,3 +48,38 @@ def test_spatialite_error_if_attempt_to_open_spatialite():
     )
     assert result.exit_code != 0
     assert "trying to load a SpatiaLite database" in result.output
+
+
+def test_metadata_yaml():
+    yaml_file = io.StringIO(
+        textwrap.dedent(
+            """
+    title: Hello from YAML
+    """
+        )
+    )
+    # Annoyingly we have to provide all default arguments here:
+    ds = serve.callback(
+        [],
+        metadata=yaml_file,
+        immutable=[],
+        host="127.0.0.1",
+        port=8001,
+        debug=False,
+        reload=False,
+        cors=False,
+        sqlite_extensions=[],
+        inspect_file=None,
+        template_dir=None,
+        plugins_dir=None,
+        static=[],
+        memory=False,
+        config=[],
+        version_note=None,
+        help_config=False,
+        return_instance=True,
+    )
+    client = _TestClient(ds.app())
+    client.ds = ds
+    response = client.get("/-/metadata.json")
+    assert {"title": "Hello from YAML"} == response.json