Index: distributed-2021.2.0/distributed/protocol/tests/test_collection.py
===================================================================
--- distributed-2021.2.0.orig/distributed/protocol/tests/test_collection.py
+++ distributed-2021.2.0/distributed/protocol/tests/test_collection.py
@@ -1,7 +1,7 @@
 import pytest
 from distributed.protocol import serialize, deserialize
 import pandas as pd
-import numpy as np
+np = pytest.importorskip("numpy")
 
 
 @pytest.mark.parametrize("collection", [tuple, dict, list])
Index: distributed-2021.2.0/distributed/protocol/tests/test_keras.py
===================================================================
--- distributed-2021.2.0.orig/distributed/protocol/tests/test_keras.py
+++ distributed-2021.2.0/distributed/protocol/tests/test_keras.py
@@ -1,4 +1,4 @@
-import numpy as np
+np = pytest.importorskip("numpy")
 from numpy.testing import assert_allclose
 import pytest
 
Index: distributed-2021.2.0/distributed/protocol/tests/test_numpy.py
===================================================================
--- distributed-2021.2.0.orig/distributed/protocol/tests/test_numpy.py
+++ distributed-2021.2.0/distributed/protocol/tests/test_numpy.py
@@ -1,6 +1,6 @@
 from zlib import crc32
 
-import numpy as np
+np = pytest.importorskip("numpy")
 import pytest
 
 from distributed.protocol import (
Index: distributed-2021.2.0/distributed/protocol/tests/test_pandas.py
===================================================================
--- distributed-2021.2.0.orig/distributed/protocol/tests/test_pandas.py
+++ distributed-2021.2.0/distributed/protocol/tests/test_pandas.py
@@ -1,4 +1,4 @@
-import numpy as np
+np = pytest.importorskip("numpy")
 import pandas as pd
 import pytest
 
Index: distributed-2021.2.0/distributed/protocol/tests/test_serialize.py
===================================================================
--- distributed-2021.2.0.orig/distributed/protocol/tests/test_serialize.py
+++ distributed-2021.2.0/distributed/protocol/tests/test_serialize.py
@@ -3,7 +3,7 @@ import copy
 import pickle
 
 import msgpack
-import numpy as np
+np = pytest.importorskip("numpy")
 import pytest
 from tlz import identity
 
Index: distributed-2021.2.0/distributed/protocol/tests/test_sparse.py
===================================================================
--- distributed-2021.2.0.orig/distributed/protocol/tests/test_sparse.py
+++ distributed-2021.2.0/distributed/protocol/tests/test_sparse.py
@@ -1,4 +1,4 @@
-import numpy as np
+np = pytest.importorskip("numpy")
 from numpy.testing import assert_allclose
 import pytest
 
Index: distributed-2021.2.0/distributed/tests/test_actor.py
===================================================================
--- distributed-2021.2.0.orig/distributed/tests/test_actor.py
+++ distributed-2021.2.0/distributed/tests/test_actor.py
@@ -426,7 +426,7 @@ async def test_load_balance_map(c, s, *w
 @gen_cluster(client=True, nthreads=[("127.0.0.1", 1)] * 4, Worker=Nanny)
 async def bench_param_server(c, s, *workers):
     import dask.array as da
-    import numpy as np
+    np = pytest.importorskip("numpy")
 
     x = da.random.random((500000, 1000), chunks=(1000, 1000))
     x = x.persist()
Index: distributed-2021.2.0/distributed/tests/test_client.py
===================================================================
--- distributed-2021.2.0.orig/distributed/tests/test_client.py
+++ distributed-2021.2.0/distributed/tests/test_client.py
@@ -5522,7 +5522,7 @@ async def test_client_active_bad_port():
 def test_turn_off_pickle(direct):
     @gen_cluster()
     async def test(s, a, b):
-        import numpy as np
+        np = pytest.importorskip("numpy")
 
         async with Client(
             s.address, asynchronous=True, serializers=["dask", "msgpack"]
@@ -5560,7 +5560,7 @@ def test_turn_off_pickle(direct):
 
 @gen_cluster()
 async def test_de_serialization(s, a, b):
-    import numpy as np
+    np = pytest.importorskip("numpy")
 
     c = await Client(
         s.address,
@@ -5581,7 +5581,7 @@ async def test_de_serialization(s, a, b)
 
 @gen_cluster()
 async def test_de_serialization_none(s, a, b):
-    import numpy as np
+    np = pytest.importorskip("numpy")
 
     c = await Client(s.address, asynchronous=True, deserializers=["msgpack"])
     try:
@@ -6420,7 +6420,7 @@ async def test_annotations_retries(c, s,
 async def test_annotations_blockwise_unpack(c, s, a, b):
     da = pytest.importorskip("dask.array")
     from dask.array.utils import assert_eq
-    import numpy as np
+    np = pytest.importorskip("numpy")
 
     # A flaky doubling function -- need extra args because it is called before
     # application to establish dtype/meta.
Index: distributed-2021.2.0/distributed/tests/test_collections.py
===================================================================
--- distributed-2021.2.0.orig/distributed/tests/test_collections.py
+++ distributed-2021.2.0/distributed/tests/test_collections.py
@@ -11,7 +11,7 @@ import dask.bag as db
 from distributed.client import wait
 from distributed.utils_test import gen_cluster
 from distributed.utils_test import client, cluster_fixture, loop  # noqa F401
-import numpy as np
+np = pytest.importorskip("numpy")
 import pandas as pd
 
 PANDAS_VERSION = LooseVersion(pd.__version__)
Index: distributed-2021.2.0/distributed/tests/test_nanny.py
===================================================================
--- distributed-2021.2.0.orig/distributed/tests/test_nanny.py
+++ distributed-2021.2.0/distributed/tests/test_nanny.py
@@ -7,8 +7,6 @@ import random
 import sys
 import multiprocessing as mp
 
-import numpy as np
-
 import pytest
 from tlz import valmap, first
 from tornado.ioloop import IOLoop
@@ -201,6 +199,7 @@ async def test_random_seed(c, s, a, b):
         assert x != y
 
     await check_func(lambda a, b: random.randint(a, b))
+    np = pytest.importorskip("numpy")
     await check_func(lambda a, b: np.random.randint(a, b))
 
 
Index: distributed-2021.2.0/distributed/tests/test_pubsub.py
===================================================================
--- distributed-2021.2.0.orig/distributed/tests/test_pubsub.py
+++ distributed-2021.2.0/distributed/tests/test_pubsub.py
@@ -37,7 +37,7 @@ async def test_speed(c, s, a, b):
             #     print(a, b, i)
         return n
 
-    import numpy as np
+    np = pytest.importorskip("numpy")
 
     x = np.random.random(1000)
 
Index: distributed-2021.2.0/distributed/tests/test_utils.py
===================================================================
--- distributed-2021.2.0.orig/distributed/tests/test_utils.py
+++ distributed-2021.2.0/distributed/tests/test_utils.py
@@ -10,7 +10,6 @@ import sys
 from time import sleep
 import traceback
 
-import numpy as np
 import pytest
 from tornado.ioloop import IOLoop
 
@@ -271,6 +270,7 @@ def test_ensure_bytes():
 
 
 def test_ensure_bytes_ndarray():
+    np = pytest.importorskip("numpy")
     result = ensure_bytes(np.arange(12))
     assert isinstance(result, bytes)
 
@@ -283,6 +283,7 @@ def test_ensure_bytes_pyarrow_buffer():
 
 
 def test_nbytes():
+    np = pytest.importorskip("numpy")
     def check(obj, expected):
         assert nbytes(obj) == expected
         assert nbytes(memoryview(obj)) == expected