test: add tests to ensure no regression leading to bug in issue 259 (#322)

Author: weibullguy

tests/_data/string_files/do_format_docstrings.toml

@@ -1065,6 +1065,51 @@ expected='''"""
     :yield: Until test complete, then run cleanup.
     """'''
 
+[issue_259]
+source = '''"""
+    "xxxxxxxxxxxxx".
+
+    blah.
+    """'''
+expected = '''""""xxxxxxxxxxxxx".
+
+    blah.
+    """'''
+
+[issue_259_black]
+source = '''"""
+    "xxxxxxxxxxxxx".
+
+    blah.
+    """'''
+expected = '''""" "xxxxxxxxxxxxx".
+
+    blah.
+    """'''
+
+[issue_259_pre_summary_space]
+source = '''"""
+    "xxxxxxxxxxxxx".
+
+    blah.
+    """'''
+expected = '''""" "xxxxxxxxxxxxx".
+
+    blah.
+    """'''
+
+[issue_259_pre_summary_newline]
+source = '''"""
+    "xxxxxxxxxxxxx".
+
+    blah.
+    """'''
+expected = '''"""
+    "xxxxxxxxxxxxx".
+
+    blah.
+    """'''
+
 [issue_263_sphinx]
 # the `xx.\n\n` ensures there are a summary and a description sections
 # the `:param a:` creates a field

tests/formatter/test_do_format_docstring.py

@@ -172,6 +172,10 @@
         ("issue_263_sphinx", NO_ARGS),
         ("issue_263_epytext", ["-s", "epytext"] + NO_ARGS),
         ("issue_271", ["--pre-summary-newline"] + WRAP_BOTH_88),
+        ("issue_259", NO_ARGS),
+        ("issue_259_black", ["--black"] + NO_ARGS),
+        ("issue_259_pre_summary_space", ["--pre-summary-space"] + NO_ARGS),
+        ("issue_259_pre_summary_newline", ["--pre-summary-newline"] + NO_ARGS),
     ],
 )
 def test_do_format_docstring(test_key, test_args, args):