add test for existing common_statements

tests/unit/test_services.py

@@ -870,3 +870,27 @@ def test_file_that_only_has_unused_imports() -> None:
     result = fix_code(source)
 
     assert result == "\n"
+
+
+def test_file_with_common_statement() -> None:
+    """
+    Given: Code with a commonly-used object.
+    When: Fix code is run.
+    Then: The appropriate import statement from the common_statements dict is added.
+    """
+    source = dedent(
+        """\
+        BeautifulSoup
+        """
+    )
+    desired_source = dedent(
+        """\
+        from bs4 import BeautifulSoup
+
+        BeautifulSoup
+        """
+    )
+
+    result = fix_code(source)
+
+    assert result == desired_source