Add test for sideset around subdomain near a boundary that will trigg…

…er sideset communication in parallel, refs idaholab#13814

test/tests/meshgenerators/sideset_around_subdomain_generator/sideset_around_subdomain_including_boundary.i

@@ -0,0 +1,56 @@
+[Mesh]
+  [./gmg]
+    type = GeneratedMeshGenerator
+    dim = 3
+    xmax = 3
+    ymax = 3
+    zmax = 3
+    nx = 3
+    ny = 3
+    nz = 3
+  []
+
+  [central_block]
+    type = SubdomainBoundingBoxGenerator
+    input = gmg
+    block_id = 2
+    bottom_left = '1 0 0'
+    top_right = '3 2 2'
+  []
+
+  [central_boundary_xminus]
+    type = SideSetsAroundSubdomainGenerator
+    input = central_block
+    block = 2
+    new_boundary = 7
+    normal = '-1 0 0'
+  []
+
+  [central_boundary_xplus]
+    type = SideSetsAroundSubdomainGenerator
+    input = central_boundary_xminus
+    block = 2
+    new_boundary = 8
+    normal = '1 0 0'
+  []
+
+  [central_boundary_y]
+    type = SideSetsAroundSubdomainGenerator
+    input = central_boundary_xplus
+    block = 2
+    new_boundary = 9
+    normal = '0 1 0'
+  []
+
+  [central_boundary_z]
+    type = SideSetsAroundSubdomainGenerator
+    input = central_boundary_y
+    block = 2
+    new_boundary = 10
+    normal = '0 0 1'
+  []
+[]
+
+[Outputs]
+  exodus = true
+[]

test/tests/meshgenerators/sideset_around_subdomain_generator/tests

@@ -32,7 +32,7 @@
       exodiff = 'around_multi_created_subdomain_in.e'
       recover = false
 
-      detail = 'around multiple subdomains within a larger domain, and'
+      detail = 'around multiple subdomains within a larger domain,'
     []
 
     [two_inside]
@@ -42,7 +42,20 @@
       exodiff = 'around_in.e'
       recover = false
 
-      detail = 'around two blocks within a domain.'
+      detail = 'around two blocks within a domain, and'
+    []
+
+    [adjacent_to_boundary]
+      type = 'Exodiff'
+      input = 'sideset_around_subdomain_including_boundary.i'
+      cli_args = "--mesh-only"
+      exodiff = 'sideset_around_subdomain_including_boundary_in.e'
+      recover = false
+
+      detail = "for a subdomain contained completely within a larger domain but containing part of that subdomain's boundary."
+      # To ensure the current coverage recipe triggers the communication of sides
+      min_parallel = 5
+      mesh_mode = 'distributed'
     []
   []