fix: include workaround to detect f-string in Python < 3.12

Author: finswimmer

src/docformatter/classify.py

@@ -317,6 +317,15 @@ def is_f_string(token: tokenize.TokenInfo, prev_token: tokenize.TokenInfo) -> bo
     if PY312:
         if tokenize.FSTRING_MIDDLE in [token.type, prev_token.type]:
             return True
+    elif any(
+        [
+            token.string.startswith('f"""'),
+            prev_token.string.startswith('f"""'),
+            token.string.startswith("f'''"),
+            prev_token.string.startswith("f'''"),
+        ]
+    ):
+        return True
 
     return False
 

tests/_data/string_files/do_format_code.toml

@@ -1213,3 +1213,23 @@ expected='''class Foo:
         """Baz."""
         ...
 '''
+
+[do_not_break_f_string_double_quotes]
+source='''foo = f"""
+  bar
+"""
+'''
+expected='''foo = f"""
+  bar
+"""
+'''
+
+[do_not_break_f_string_single_quotes]
+source="""foo = f'''
+  bar
+'''
+"""
+expected="""foo = f'''
+  bar
+'''
+"""

tests/formatter/test_do_format_code.py

@@ -138,6 +138,8 @@
         ("two_lines_between_stub_classes", NO_ARGS),
         ("two_lines_between_stub_classes_with_preceding_comment", NO_ARGS),
         ("ellipses_is_code_line", NO_ARGS),
+        ("do_not_break_f_string_double_quotes", NO_ARGS),
+        ("do_not_break_f_string_single_quotes", NO_ARGS),
     ],
 )
 def test_do_format_code(test_key, test_args, args):