Add test for fractal box

- Fractal boxes will build without error using the parallel build
  process, however they are not correct. Each rank builds its own part
  of the fractal box however there is no continuity across MPI
  boundaries

reframe_tests/tests/src/geometry_tests/fractal_box_geometry/fractal_box_full.in

@@ -0,0 +1,13 @@
+#title: Heterogeneous soil using a stochastic distribution of dielectric properties given by a mixing model from Peplinski
+#domain: 0.100 0.100 0.100
+#dx_dy_dz: 0.001 0.001 0.001
+#time_window: 3e-9
+
+#waveform: ricker 1 1.5e9 my_ricker
+#hertzian_dipole: y 0.02 0.02 0.02 my_ricker
+#rx: 0.080 0.080 0.080
+
+#soil_peplinski: 0.5 0.5 2.0 2.66 0.001 0.25 my_soil
+#fractal_box: 0 0 0 0.1 0.1 0.1 1.5 1 1 1 50 my_soil my_soil_box 42
+
+#geometry_objects_write: 0 0 0 0.1 0.1 0.1 full_volume

reframe_tests/tests/test_geometry.py

@@ -97,6 +97,13 @@ class TestEllipsoidGeometry(GprMaxRegressionTest):
     )
 
 
+@rfm.simple_test
+class TestFractalBoxGeometry(GprMaxRegressionTest):
+    tags = {"test", "serial", "geometery", "fractal", "box", "fractal_box"}
+    sourcesdir = "src/geometry_tests/fractal_box_geometry"
+    model = parameter(["fractal_box_full"])
+
+
 # TODO: Add Mixin class to enable testing that invalid geometry throws an error
 @rfm.simple_test
 class TestPlateGeometry(GprMaxRegressionTest):
@@ -179,6 +186,13 @@ class TestEllipsoidGeometryMpi(MpiMixin, TestEllipsoidGeometry):
     test_dependency = TestEllipsoidGeometry
 
 
+@rfm.simple_test
+class TestFractalBoxGeometryMpi(MpiMixin, TestFractalBoxGeometry):
+    tags = {"test", "mpi", "geometery", "fractal", "box", "fractal_box"}
+    mpi_layout = parameter([[2, 2, 2], [3, 3, 3], [4, 4, 4]])
+    test_dependency = TestFractalBoxGeometry
+
+
 @rfm.simple_test
 class TestPlateGeometryMpi(MpiMixin, TestPlateGeometry):
     tags = {"test", "mpi", "geometery", "plate"}