Speed up CI test suite on non-Linux platforms

tests/magics/test_matplotlib_magic.py

@@ -1,5 +1,6 @@
 import asyncio
 import importlib.util
+import sys
 
 import pytest
 
@@ -20,6 +21,7 @@ def restore_ipython_display():
     IPython.display.display = original
 
 
+@pytest.mark.skipif(sys.platform != "linux", reason="Too slow on non-Linux CI")
 def test_matplotlib_magic_sets_backend() -> None:
     """%matplotlib sets the matplotlib backend."""
     import matplotlib

tests/magics/test_parallel_magic.py

@@ -17,7 +17,9 @@
 
 
 @pytest.mark.skipif(ipyparallel is None, reason="Requires ipyparallel")
-@pytest.mark.skipif(sys.platform == "darwin", reason="Fails on darwin")
+@pytest.mark.skipif(
+    sys.platform != "linux", reason="Requires ipcluster; too slow on non-Linux CI"
+)
 def test_parallel_magic() -> None:
     kernel = get_kernel(EvalKernel)
     # start up an EvalKernel on each node:
@@ -31,6 +33,9 @@ def test_parallel_magic() -> None:
 
 
 @pytest.mark.skipif(ipyparallel is None, reason="Requires ipyparallel")
+@pytest.mark.skipif(
+    sys.platform != "linux", reason="Requires ipcluster; too slow on non-Linux CI"
+)
 def test_px_error_reports_exception_not_noisy_traceback() -> None:
     """%%px with failing code should report the remote error, not a noisy
     'Error in calling magic' wrapper with full Python traceback (issue #61)."""

tests/test_expect.py

@@ -160,7 +160,7 @@ def test_expect_eof(self) -> None:
         assert the_old_way == the_new_way, hex_diff(the_old_way, the_new_way)
 
     def test_expect_timeout(self) -> None:
-        p = pexpect.spawn("cat", timeout=5)
+        p = pexpect.spawn("cat", timeout=1)
         p.expect(pexpect.TIMEOUT)  # This tells it to wait for timeout.
         self.assertEqual(p.after, pexpect.TIMEOUT)
 

tests/test_process_metakernel.py

@@ -32,7 +32,7 @@ def test_process_metakernel() -> None:
     kernel.Display(html)
 
     asyncio.run(
-        kernel.do_execute(r'for i in {1..3};do echo -ne "$i\r"; sleep 1; done', None)
+        kernel.do_execute(r'for i in {1..3};do echo -ne "$i\r"; sleep 0.1; done', None)
     )
     text = get_log_text(kernel)
     assert r"1\r2\r3\r" in text

tests/test_replwrap.py

@@ -37,7 +37,7 @@ def test_bash(self) -> None:
         assert "SLEEP" in res, res
 
         # should handle CR by default
-        cmd = r'for i in {1..3};do echo -ne "\r$i"; sleep 1; done'
+        cmd = r'for i in {1..3};do echo -ne "\r$i"; sleep 0.1; done'
         res = bash.run_command(cmd)
         assert "\r1\r2\r3" in res