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-rw-r--r--pylint/test/functional/comparisons.py11
-rw-r--r--pylint/test/functional/comparisons.txt5
2 files changed, 16 insertions, 0 deletions
diff --git a/pylint/test/functional/comparisons.py b/pylint/test/functional/comparisons.py
new file mode 100644
index 0000000..73067c8
--- /dev/null
+++ b/pylint/test/functional/comparisons.py
@@ -0,0 +1,11 @@
+# pylint: disable=missing-docstring, invalid-name
+x = 42
+a = x is None
+b = x == None # [singleton-comparison]
+c = x == True # [singleton-comparison]
+d = x == False # [singleton-comparison]
+e = True == True # [singleton-comparison]
+f = x is 1
+g = 123 is "123"
+h = None is x
+i = None == x # [singleton-comparison]
diff --git a/pylint/test/functional/comparisons.txt b/pylint/test/functional/comparisons.txt
new file mode 100644
index 0000000..fd1fa98
--- /dev/null
+++ b/pylint/test/functional/comparisons.txt
@@ -0,0 +1,5 @@
+singleton-comparison:4::Comparison to None should be 'expr is None'
+singleton-comparison:5::Comparison to True should be just 'expr' or 'expr is True'
+singleton-comparison:6::Comparison to False should be 'not expr' or 'expr is False'
+singleton-comparison:7::Comparison to True should be just 'expr' or 'expr is True'
+singleton-comparison:11::Comparison to None should be 'expr is None'