1 files changed, 79 insertions, 0 deletions
diff --git a/tests/functional/dangerous_default_value.py b/tests/functional/dangerous_default_value.py
new file mode 100644
index 000000000..58a22f443
--- /dev/null
+++ b/tests/functional/dangerous_default_value.py
@@ -0,0 +1,79 @@
+# pylint: disable=missing-docstring
+
+
+HEHE = {}
+
+def function1(value=[]): # [dangerous-default-value]
+    """docstring"""
+    return value
+
+def function2(value=HEHE): # [dangerous-default-value]
+    """docstring"""
+    return value
+
+def function3(value):
+    """docstring"""
+    return value
+
+def function4(value=set()): # [dangerous-default-value]
+    """set is mutable and dangerous."""
+    return value
+
+def function5(value=frozenset()):
+    """frozenset is immutable and safe."""
+    return value
+
+GLOBAL_SET = set()
+
+def function6(value=GLOBAL_SET): # [dangerous-default-value]
+    """set is mutable and dangerous."""
+    return value
+
+def function7(value=dict()): # [dangerous-default-value]
+    """dict is mutable and dangerous."""
+    return value
+
+def function8(value=list()):  # [dangerous-default-value]
+    """list is mutable and dangerous."""
+    return value
+
+def function9(value=[1, 2, 3, 4]): # [dangerous-default-value]
+    """list with items should not output item values in error message"""
+    return value
+
+def function10(value={'a': 1, 'b': 2}): # [dangerous-default-value]
+    """dictionaries with items should not output item values in error message"""
+    return value
+
+def function11(value=list([1, 2, 3])): # [dangerous-default-value]
+    """list with items should not output item values in error message"""
+    return value
+
+def function12(value=dict([('a', 1), ('b', 2)])): # [dangerous-default-value]
+    """dictionaries with items should not output item values in error message"""
+    return value
+
+OINK = {
+    'a': 1,
+    'b': 2
+}
+
+def function13(value=OINK): # [dangerous-default-value]
+    """dictionaries with items should not output item values in error message"""
+    return value
+
+def function14(value=dict([(1, 2), (1, 2, 3)])): # [dangerous-default-value]
+    """a dictionary which will not be inferred to a syntax AST, but to an
+    astroid.Instance.
+    """
+    return value
+
+INVALID_DICT = dict([(1, 2), (1, 2, 3)])
+
+def function15(value=INVALID_DICT): # [dangerous-default-value]
+    """The same situation as function14."""
+    return value
+
+def function16(value={1}): # [dangerous-default-value]
+    """set literal as default value"""
+    return value