Test coverage for restricted outer boundary

test/tests/meshgenerators/poly2tri_mesh_generator/poly2tri_from_1d_sbdids.i

@@ -0,0 +1,38 @@
+[Mesh]
+  [./left_bdy]
+    type = PolyLineMeshGenerator
+    points = '-3.0 0.0 0.0
+              -2.0 -1.0 0.0
+              -1.0 0.0 0.0
+              -2.0 2.0 0.0'
+    loop = true
+  []
+  [./right_bdy]
+    type = PolyLineMeshGenerator
+    points = '3.0 0.0 0.0
+              2.0 -1.0 0.0
+              1.0 0.0 0.0
+              2.0 2.0 0.0'
+    loop = true
+  []
+  [./right_sbd1]
+    type = SubdomainIDGenerator
+    input = right_bdy
+    subdomain_id = 1
+  []
+  [./both_bdy]
+    type = CombinerGenerator
+    inputs = 'left_bdy right_sbd1'
+  []
+  [./triang]
+    type = Poly2TriMeshGenerator
+    boundary = 'both_bdy'
+    input_subdomain_names = 1 # only the right half
+    refine_boundary = true
+    desired_area = 0.1
+  []
+[]
+
+[Outputs]
+  exodus = true
+[]

test/tests/meshgenerators/poly2tri_mesh_generator/poly2tri_from_2d_bcids.i

@@ -0,0 +1,42 @@
+[Mesh]
+  [./left_bdy]
+    type = PolyLineMeshGenerator
+    points = '-3.0 0.0 0.0
+              -2.0 -1.0 0.0
+              -1.0 0.0 0.0
+              -2.0 2.0 0.0'
+    loop = true
+  []
+  [./right_bdy]
+    type = PolyLineMeshGenerator
+    points = '3.0 0.0 0.0
+              2.0 -1.0 0.0
+              1.0 0.0 0.0
+              2.0 2.0 0.0'
+    loop = true
+  []
+  [./left_2d]
+    type = Poly2TriMeshGenerator
+    boundary = 'left_bdy'
+  []
+  [./right_2d]
+    type = Poly2TriMeshGenerator
+    boundary = 'right_bdy'
+    output_boundary_id = 1
+  []
+  [./both_2d]
+    type = CombinerGenerator
+    inputs = 'left_2d right_2d'
+  []
+  [./triang]
+    type = Poly2TriMeshGenerator
+    boundary = 'both_2d'
+    input_boundary_names = 1 # only the right half
+    refine_boundary = true
+    desired_area = 0.1
+  []
+[]
+
+[Outputs]
+  exodus = true
+[]

test/tests/meshgenerators/poly2tri_mesh_generator/tests

@@ -36,13 +36,29 @@
       recover = false
       detail = "or a 2D input mesh"
     []
+    [subboundary_1d]
+      type = 'Exodiff'
+      input = 'poly2tri_from_1d_sbdids.i'
+      cli_args = '--mesh-only'
+      exodiff = 'poly2tri_from_1d_sbdids_in.e'
+      recover = false
+      detail = "or a specified subset"
+    []
+    [subdomain_2d]
+      type = 'Exodiff'
+      input = 'poly2tri_from_2d_bcids.i'
+      cli_args = '--mesh-only'
+      exodiff = 'poly2tri_from_2d_bcids_in.e'
+      recover = false
+      detail = "in either case"
+    []
     [with_holes]
       type = 'Exodiff'
       input = 'poly2tri_with_holes.i'
       cli_args = '--mesh-only'
       exodiff = 'poly2tri_with_holes_in.e'
       recover = false
-      detail = "respecting any specified interior 'hole' meshes"
+      detail = "while respecting any specified interior 'hole' meshes"
     []
     [stitching]
       type = 'Exodiff'