[test] Modernize PETSc test

cscs-checks/libraries/petsc/petsc_helloworld.py

@@ -7,30 +7,39 @@
 import reframe.utility.sanity as sn
 
 
-@rfm.parameterized_test(['dynamic'], ['static'])
+@rfm.simple_test
 class PetscPoisson2DCheck(rfm.RegressionTest):
-    def __init__(self, linkage):
+    linkage = parameter(['dynamic', 'static'])
+    valid_systems = ['daint:gpu', 'daint:mc', 'dom:gpu', 'dom:mc']
+    valid_prog_environs = ['PrgEnv-cray', 'PrgEnv-gnu', 'PrgEnv-intel']
+    modules = ['cray-petsc']
+    build_system = 'SingleSource'
+    sourcepath = 'poisson2d.c'
+    num_tasks = 16
+    num_tasks_per_node = 8
+    executable_opts = ['-da_grid_x 4', '-da_grid_y 4', '-ksp_monitor']
+    tags = {'production', 'craype'}
+    maintainers = ['AJ', 'CB']
+
+    @run_after('init')
+    def set_description(self):
         self.descr = (f'Compile/run PETSc 2D Poisson example with cray-petsc '
-                      f'({linkage} linking)')
-        self.valid_systems = ['daint:gpu', 'daint:mc', 'dom:gpu', 'dom:mc']
-        self.valid_prog_environs = ['PrgEnv-cray', 'PrgEnv-gnu',
-                                    'PrgEnv-intel']
-        self.sourcepath = 'poisson2d.c'
-        self.modules = ['cray-petsc']
-        self.num_tasks = 16
-        self.num_tasks_per_node = 8
-        self.build_system = 'SingleSource'
+                      f'({self.linkage} linking)')
+
+    @run_before('compile')
+    def set_variables(self):
+        self.variables = {'CRAYPE_LINK_TYPE': self.linkage}
+
+    @run_before('compile')
+    def intel_workaround(self):
         # FIXME: static compilation yields a link error in case of
         # PrgEnv-intel (Cray Bug #255701) workaround use C++ compiler
-        if linkage == 'static':
+        if self.linkage == 'static':
             self.build_system.cc = 'CC'
 
-        self.variables = {'CRAYPE_LINK_TYPE': linkage}
-        self.executable_opts = ['-da_grid_x 4', '-da_grid_y 4', '-ksp_monitor']
-
+    @sanity_function
+    def assert_convergence(self):
         # Check the final residual norm for convergence
         norm = sn.extractsingle(r'\s+\d+\s+KSP Residual norm\s+(?P<norm>\S+)',
                                 self.stdout, 'norm', float, -1)
-        self.sanity_patterns = sn.assert_lt(norm, 1.0e-5)
-        self.tags = {'production', 'craype'}
-        self.maintainers = ['AJ', 'CB']
+        return sn.assert_lt(norm, 1.0e-5)