initial commit

tests/unit_tests/test_formatting.py

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+"""Test formatting functionality."""
+import pytest
+
+from langchain.formatting import formatter
+
+
+def test_valid_formatting() -> None:
+    """Test formatting works as expected."""
+    template = "This is a {foo} test."
+    output = formatter.format(template, foo="good")
+    expected_output = "This is a good test."
+    assert output == expected_output
+
+
+def test_does_not_allow_args() -> None:
+    """Test formatting raises error when args are provided."""
+    template = "This is a {} test."
+    with pytest.raises(ValueError):
+        formatter.format(template, "good")
+
+
+def test_does_not_allow_extra_kwargs() -> None:
+    """Test formatting does not allow extra key word arguments."""
+    template = "This is a {foo} test."
+    with pytest.raises(KeyError):
+        formatter.format(template, foo="good", bar="oops")