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-rw-r--r--lib/spack/spack/test/environment.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/spack/spack/test/environment.py b/lib/spack/spack/test/environment.py
index 97581ecb76..f44282d6f3 100644
--- a/lib/spack/spack/test/environment.py
+++ b/lib/spack/spack/test/environment.py
@@ -62,4 +62,4 @@ class EnvironmentTest(unittest.TestCase):
copy_construct = EnvironmentModifications(env)
self.assertEqual(len(copy_construct), 2)
for x, y in zip(env, copy_construct):
- self.assertIs(x, y)
+ assert x is y