ci: tweak mpi setup to allow -s and hide output

conftest.py

@@ -142,16 +142,28 @@ def parallel(item, m):
             raise ValueError("Can't run test: unexpected mode `%s`" % m)
 
     pyversion = sys.executable
+
+    # Keep all invocation arguments up to test path
+    params = item.config.invocation_params.args
+    pyarg = []
+    for p in params:
+        if p.startswith('tests'):
+            break
+        else:
+            pyarg.append(p)
+
     # Only spew tracebacks on rank 0.
     # Run xfailing tests to ensure that errors are reported to calling process
     if item.cls is not None:
         testname = "%s::%s::%s" % (item.fspath, item.cls.__name__, item.name)
     else:
         testname = "%s::%s" % (item.fspath, item.name)
-    args = ["-n", "1", pyversion, "-m", "pytest", "--runxfail", "-q", testname]
+
+    args = ["-n", "1", pyversion, "-m", "pytest", "--no-summary", *pyarg,
+            "--runxfail", "-qq", testname]
     if nprocs > 1:
         args.extend([":", "-n", "%d" % (nprocs - 1), pyversion, "-m", "pytest",
-                     "--runxfail", "--tb=no", "-q", testname])
+                     "-s", "--runxfail", "--tb=no", "-qq", "--no-summary", testname])
     # OpenMPI requires an explicit flag for oversubscription. We need it as some
     # of the MPI tests will spawn lots of processes
     if mpi_distro == 'OpenMPI':

tests/test_linearize.py

@@ -152,7 +152,7 @@ def test_interpolation_msf():
     assert op1.cfunction
 
 
-@pytest.mark.parallel(mode=[(1, 'diag2')])
+@pytest.mark.parallel(mode=[(2, 'diag2')])
 def test_codegen_quality0(mode):
     grid = Grid(shape=(4, 4))
     u = TimeFunction(name='u', grid=grid, space_order=2)
@@ -170,7 +170,6 @@ def test_codegen_quality0(mode):
     # for the efunc args
     # (the other three obviously are _POSIX_C_SOURCE, START, STOP)
     assert len(op._headers) == 6
-    return "bonjour"
 
 
 def test_codegen_quality1():