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"""Tests for SchemaForge schema diffing (diff.py)."""
from __future__ import annotations
import sys
from pathlib import Path
sys.path.insert(0, str(Path(__file__).parent.parent / "src"))
from schemaforge.diff import _diff_tables, diff_schemas
from schemaforge.ir import Column, ColumnType, Index, Table
# ── Unit tests for _diff_tables ──
def _col(name: str, col_type: ColumnType = ColumnType.STRING, **kwargs) -> Column:
return Column(name=name, type=col_type, **kwargs)
def _table(
name: str, columns: list[Column] | None = None, indexes: list[Index] | None = None
) -> Table:
return Table(name=name, columns=columns or [], indexes=indexes or [])
class TestDiffTables:
"""Unit tests for _diff_tables comparing two Table IR objects."""
def test_identical_tables(self):
ta = _table("users", [_col("id", ColumnType.INTEGER, primary_key=True)])
tb = _table("users", [_col("id", ColumnType.INTEGER, primary_key=True)])
assert _diff_tables(ta, tb) == []
def test_added_column(self):
ta = _table("users", [_col("id", ColumnType.INTEGER, primary_key=True)])
tb = _table(
"users",
[
_col("id", ColumnType.INTEGER, primary_key=True),
_col("email", ColumnType.STRING),
],
)
diffs = _diff_tables(ta, tb)
assert any('+ column "email"' in d for d in diffs)
def test_removed_column(self):
ta = _table(
"users",
[
_col("id", ColumnType.INTEGER, primary_key=True),
_col("email", ColumnType.STRING),
],
)
tb = _table("users", [_col("id", ColumnType.INTEGER, primary_key=True)])
diffs = _diff_tables(ta, tb)
assert any('- column "email"' in d for d in diffs)
def test_type_change(self):
ta = _table("users", [_col("age", ColumnType.INTEGER)])
tb = _table("users", [_col("age", ColumnType.STRING)])
diffs = _diff_tables(ta, tb)
assert any("integer" in d and "string" in d for d in diffs)
def test_nullable_change(self):
ta = _table("users", [_col("name", ColumnType.STRING, nullable=True)])
tb = _table("users", [_col("name", ColumnType.STRING, nullable=False)])
diffs = _diff_tables(ta, tb)
assert any("nullable" in d for d in diffs)
def test_primary_key_change(self):
ta = _table("users", [_col("id", ColumnType.INTEGER, primary_key=False)])
tb = _table("users", [_col("id", ColumnType.INTEGER, primary_key=True)])
diffs = _diff_tables(ta, tb)
assert any("PK" in d for d in diffs)
def test_default_change(self):
ta = _table("users", [_col("status", ColumnType.STRING, default="active")])
tb = _table("users", [_col("status", ColumnType.STRING, default="inactive")])
diffs = _diff_tables(ta, tb)
assert any("default" in d for d in diffs)
def test_unique_change(self):
"""Unique constraint changes should appear in diff output."""
ta = _table("users", [_col("email", ColumnType.STRING, unique=True)])
tb = _table("users", [_col("email", ColumnType.STRING, unique=False)])
diffs = _diff_tables(ta, tb)
assert any("unique" in d for d in diffs)
assert "True" in diffs[0]
assert "False" in diffs[0]
def test_comment_change(self):
"""Comment changes should appear in diff output."""
ta = _table("users", [_col("id", ColumnType.INTEGER, comment="old comment")])
tb = _table("users", [_col("id", ColumnType.INTEGER, comment="new comment")])
diffs = _diff_tables(ta, tb)
assert any("comment" in d for d in diffs)
def test_added_index(self):
"""Added index should appear in diff output."""
ta = _table("users", [_col("email", ColumnType.STRING)], indexes=[])
tb = _table(
"users",
[_col("email", ColumnType.STRING)],
indexes=[
Index(name="idx_email", columns=["email"]),
],
)
diffs = _diff_tables(ta, tb)
assert any('+ index "idx_email"' in d for d in diffs)
def test_removed_index(self):
"""Removed index should appear in diff output."""
ta = _table(
"users",
[_col("email", ColumnType.STRING)],
indexes=[
Index(name="idx_email", columns=["email"]),
],
)
tb = _table("users", [_col("email", ColumnType.STRING)], indexes=[])
diffs = _diff_tables(ta, tb)
assert any('- index "idx_email"' in d for d in diffs)
def test_no_index_diff_for_unnamed(self):
"""Indexes with empty names should not produce spurious diffs."""
ta = _table(
"users",
[_col("email", ColumnType.STRING)],
indexes=[
Index(name="", columns=["email"]),
],
)
tb = _table(
"users",
[_col("email", ColumnType.STRING)],
indexes=[
Index(name="", columns=["email"]),
],
)
diffs = _diff_tables(ta, tb)
assert not any("index" in d for d in diffs)
# ── Integration tests for diff_schemas ──
SQL_UNIQUE_A = """CREATE TABLE users (
id INTEGER PRIMARY KEY,
email VARCHAR(255) UNIQUE
);
"""
SQL_UNIQUE_B = """CREATE TABLE users (
id INTEGER PRIMARY KEY,
email VARCHAR(255)
);
"""
SQL_TABLE_ADDED = """CREATE TABLE users (
id INTEGER PRIMARY KEY,
name VARCHAR(100)
);
CREATE TABLE posts (
id INTEGER PRIMARY KEY,
title VARCHAR(200)
);
"""
SQL_TABLE_REMOVED = """CREATE TABLE users (
id INTEGER PRIMARY KEY,
name VARCHAR(100)
);
"""
SQL_ENUM_ADDED = """CREATE TYPE status AS ENUM ('active', 'inactive', 'pending');
CREATE TABLE users (
id INTEGER PRIMARY KEY,
name VARCHAR(100)
);
"""
SQL_ENUM_REMOVED = """CREATE TABLE users (
id INTEGER PRIMARY KEY,
name VARCHAR(100)
);
"""
SQL_ENUM_CHANGED = """CREATE TYPE status AS ENUM ('active', 'inactive', 'pending');
CREATE TABLE users (
id INTEGER PRIMARY KEY,
name VARCHAR(100)
);
"""
SQL_ENUM_ORIGINAL = """CREATE TYPE status AS ENUM ('active', 'inactive');
CREATE TABLE users (
id INTEGER PRIMARY KEY,
name VARCHAR(100)
);
"""
SQL_IDENTICAL = """CREATE TABLE users (
id INTEGER PRIMARY KEY,
name VARCHAR(100) NOT NULL
);
"""
class TestDiffSchemas:
"""Integration tests for diff_schemas using SQL text."""
def test_identical_schemas(self):
result = diff_schemas(SQL_IDENTICAL, SQL_IDENTICAL, "sql")
assert "No differences found" in result
def test_unique_change_detected(self):
"""Column going from UNIQUE to non-UNIQUE should be reported."""
result = diff_schemas(SQL_UNIQUE_A, SQL_UNIQUE_B, "sql")
assert "unique" in result
assert "No differences found" not in result
def test_added_table(self):
result = diff_schemas(SQL_TABLE_REMOVED, SQL_TABLE_ADDED, "sql")
assert "Added tables" in result
assert "posts" in result
def test_removed_table(self):
result = diff_schemas(SQL_TABLE_ADDED, SQL_TABLE_REMOVED, "sql")
assert "Removed tables" in result
assert "posts" in result
def test_added_enum(self):
"""Added enum type should be reported."""
result = diff_schemas(SQL_ENUM_REMOVED, SQL_ENUM_ADDED, "sql")
assert "Added enums" in result
assert "status" in result
def test_removed_enum(self):
"""Removed enum type should be reported."""
result = diff_schemas(SQL_ENUM_ADDED, SQL_ENUM_REMOVED, "sql")
assert "Removed enums" in result
assert "status" in result
def test_enum_value_change(self):
"""Changed enum values should be reported."""
result = diff_schemas(SQL_ENUM_ORIGINAL, SQL_ENUM_CHANGED, "sql")
# The enum 'status' has values changed from ['active','inactive'] to ['active','inactive','pending']
assert "status" in result
assert "pending" in result or "values" in result
def test_unsupported_format(self):
result = diff_schemas("x", "y", "badformat")
assert "Unsupported" in result