tests: Add op.apply() for operators execution

tests/test_skewing.py

@@ -1,6 +1,6 @@
 import pytest
 
-from sympy import Add, cos, sin, sqrt  # noqa
+from sympy import Max, Add, cos, sin, sqrt  # noqa
 
 from devito.core.autotuning import options  # noqa
 from devito import Function, TimeFunction, Grid, Operator, Eq # noqa
@@ -31,6 +31,7 @@ def test_skewed_bounds(self, expr, expected):
         eqn = eval(expr)
         # List comprehension would need explicit locals/globals mappings to eval
         op = Operator(eqn, opt=('blocking', {'skewing': True}))
+        op.apply(time_M=5)
         iters = FindNodes(Iteration).visit(op)
         time_iter = [i for i in iters if i.dim.is_Time]
         assert len(time_iter) == 1
@@ -78,7 +79,7 @@ def test_no_sequential(self, expr, expected):
         eqn = eval(expr)
         # List comprehension would need explicit locals/globals mappings to eval
         op = Operator(eqn, opt=('blocking', {'skewing': True}))
-
+        op.apply()
         iters = FindNodes(Iteration).visit(op)
         time_iter = [i for i in iters if i.dim.is_Time]
         assert len(time_iter) == 0
@@ -121,6 +122,7 @@ def test_skewing_codegen(self, expr, expected, skewing, blockinner):
         # List comprehension would need explicit locals/globals mappings to eval
         op = Operator(eqn, opt=('blocking', {'blocklevels': 0, 'skewing': skewing,
                                              'blockinner': blockinner}))
+        op.apply(time_M=5)
 
         iters = FindNodes(Iteration).visit(op)