From e681b130852bb7da6663ad9f791876c704ee6acf Mon Sep 17 00:00:00 2001
From: xumingkuan <xumingkuan0721@126.com>
Date: Thu, 27 Feb 2020 13:43:50 -0500
Subject: [PATCH] Add tests for unsupported "compare" operators (#547)

* Add tests for unsupported "compare" operators

* Add tests for unsupported "compare" operators
---
 tests/python/test_compare.py | 49 +++++++++++++++++++++++++++++++++++-
 1 file changed, 48 insertions(+), 1 deletion(-)

diff --git a/tests/python/test_compare.py b/tests/python/test_compare.py
index d921b18f418ad..47ad3a2108536 100644
--- a/tests/python/test_compare.py
+++ b/tests/python/test_compare.py
@@ -25,7 +25,6 @@ def func():
     a[9] = c >= b
     a[10] = c == b
     a[11] = c != b
-    # a[12] = b is not c  # not supported
 
   func()
   assert a[0]
@@ -118,3 +117,51 @@ def func():
   func()
   assert a[0]
   assert not a[1]
+
+
+@ti.must_throw(ti.TaichiSyntaxError)
+def test_is():
+  b = ti.var(ti.i32, shape=())
+  c = ti.var(ti.i32, shape=())
+
+  @ti.kernel
+  def func():
+    a = b is c
+
+  func()
+
+
+@ti.must_throw(ti.TaichiSyntaxError)
+def test_is_not():
+  b = ti.var(ti.i32, shape=())
+  c = ti.var(ti.i32, shape=())
+
+  @ti.kernel
+  def func():
+    a = b is not c
+
+  func()
+
+
+@ti.must_throw(ti.TaichiSyntaxError)
+def test_in():
+  b = ti.var(ti.i32, shape=())
+  c = ti.var(ti.i32, shape=())
+
+  @ti.kernel
+  def func():
+    a = b in c
+
+  func()
+
+
+@ti.must_throw(ti.TaichiSyntaxError)
+def test_not_in():
+  b = ti.var(ti.i32, shape=())
+  c = ti.var(ti.i32, shape=())
+
+  @ti.kernel
+  def func():
+    a = b not in c
+
+  func()