Check for nots too many in comparison expressions

1 files changed, 41 insertions, 0 deletions

diff --git a/pylint/test/functional/unneeded_not.py b/pylint/test/functional/unneeded_not.py
new file mode 100644
index 0000000..882a238
--- /dev/null
+++ b/pylint/test/functional/unneeded_not.py
@@ -0,0 +1,41 @@
+"""Check exceeding negations in boolean expressions trigger warnings"""
+
+# pylint: disable=singleton-comparison
+
+def unneeded_not():
+    """This is not ok
+    """
+    bool_var = True
+    someint = 2
+    if not not bool_var:  # [unneeded-not]
+        pass
+    if not someint == 1:  # [unneeded-not]
+        pass
+    if not someint != 1:  # [unneeded-not]
+        pass
+    if not someint < 1:  # [unneeded-not]
+        pass
+    if not someint > 1:  # [unneeded-not]
+        pass
+    if not someint <= 1:  # [unneeded-not]
+        pass
+    if not someint >= 1:  # [unneeded-not]
+        pass
+    if not not someint:  # [unneeded-not]
+        pass
+    if not bool_var == True:  # [unneeded-not]
+        pass
+    if not bool_var == False:  # [unneeded-not]
+        pass
+    if not bool_var != True:  # [unneeded-not]
+        pass
+    if not True == True:  # [unneeded-not]
+        pass
+
+
+def not_checked():
+    """This is ok"""
+    bool_var = True
+    someint = 2
+    if not(bool_var == False and someint == 1):
+        pass