1 files changed, 126 insertions, 0 deletions
diff --git a/tests/functional/c/consider/consider_join.py b/tests/functional/c/consider/consider_join.py
new file mode 100644
index 000000000..24cd6dd49
--- /dev/null
+++ b/tests/functional/c/consider/consider_join.py
@@ -0,0 +1,126 @@
+# pylint: disable=missing-docstring,invalid-name,undefined-variable,multiple-statements
+
+# Variations of 'result'
+result = ''
+for number in ['1', '2', '3']:
+    result += number  # [consider-using-join]
+
+result = 'header'
+for number in ['1', '2', '3']:
+    result += number  # [consider-using-join]
+
+result = another_result = ''
+for number in ['1', '2', '3']:
+    result += number  # [consider-using-join]
+
+another_result = result = ''
+for number in ['1', '2', '3']:
+    result += number  # [consider-using-join]
+
+result = 0  # result is not a string
+for number in ['1', '2', '3']:
+    result += number
+
+RESULT = ''  # wrong name / initial variable missing
+for number in ['1', '2', '3']:
+    result += [number]
+
+string_variable = ''
+result = string_variable  # type of 'result' not obviously a string
+for number in ['1', '2', '3']:
+    result += number
+
+result = ''
+another_result = ''  # result defined too early
+for number in ['1', '2', '3']:
+    result += [number]
+
+for number in ['1', '2', '3']:  # 'result'-definition missing
+    result += number
+
+
+# Variations of 'number'
+result = ''  # no concatenation (iterator-name differs)
+for name in ['1', '2', '3']:
+    result += number
+
+result = ''  # no concatenation (iterator-name differs)
+for _ in ['1', '2', '3']:
+    result += number
+# 'exprlist' is not a single name
+for index, number in ['1', '2', '3']:
+    result += number
+
+
+# Variations of 'iterable'
+result = ''
+for number in []:
+    result += number  # [consider-using-join]
+
+result = ''
+for number in "a text":
+    result += number  # [consider-using-join]
+
+result = ''
+for number in [1, 2, 3]:
+    result += number  # [consider-using-join]
+
+a_list = [1, 2, 3]
+result = ''
+for number in a_list:
+    result += number  # [consider-using-join]
+
+result = ''
+for number in ['1', '2', '3']:
+    result += number  # [consider-using-join]
+
+result = ''
+for number in undefined_iterable:
+    result += number  # [consider-using-join]
+
+
+# Variations of loop-body
+result = ''  # addition is not the only part of the body
+for number in ['1', '2', '3']:
+    print(number)
+    result += number
+
+result = ''  # addition is not the only part of the body
+for number in ['1', '2', '3']:
+    result += number
+    print(number)
+
+result = ''  # augmented addition is not a simple one
+for number in ['1', '2', '3']:
+    result += '4' + number
+
+result = ''  # assignment is not augmented
+for number in ['1', '2', '3']:
+    result = number
+
+result = ''  # augmented assignment is not an addition
+for number in ['1', '2', '3']:
+    result -= number
+
+result = ''  # addition is not the 'number'-iterable
+for number in ['1', '2', '3']:
+    result += another_number
+
+result = ''
+for number in ['1', '2', '3']: result += number  # [consider-using-join]
+
+result = ''
+for number in ['1']:
+    result.result += number
+
+# Does not emit if the body is more complex
+result = {'context': 1}
+result['context'] = 0
+for number in ['1']:
+    result1 = 42 + int(number)
+    result['context'] += result1 * 24
+
+# Does not crash if the previous sibling does not have AssignNames
+result['context'] = 0
+for number in ['1']:
+    result['context'] += 24