sqlite-utils insert --sniff option, closes #230

tests/test_sniff.py

@@ -0,0 +1,25 @@
+from sqlite_utils import cli, Database
+from click.testing import CliRunner
+import pathlib
+import pytest
+
+sniff_dir = pathlib.Path(__file__).parent / "sniff"
+
+
+@pytest.mark.parametrize("filepath", sniff_dir.glob("example*"))
+def test_sniff(tmpdir, filepath):
+    db_path = str(tmpdir / "test.db")
+    runner = CliRunner()
+    result = runner.invoke(
+        cli.cli,
+        ["insert", db_path, "creatures", str(filepath), "--sniff"],
+        catch_exceptions=False,
+    )
+    assert result.exit_code == 0, result.stdout
+    db = Database(db_path)
+    assert list(db["creatures"].rows) == [
+        {"id": "1", "species": "dog", "name": "Cleo", "age": "5"},
+        {"id": "2", "species": "dog", "name": "Pancakes", "age": "4"},
+        {"id": "3", "species": "cat", "name": "Mozie", "age": "8"},
+        {"id": "4", "species": "spider", "name": "Daisy, the tarantula", "age": "6"},
+    ]