add a more complicated test for extra element integers to test stitch…

…er of meshes with different set of integers idaholab#13764

test/tests/mesh/multi_elem_integers/multi_element_integer.i

@@ -0,0 +1,103 @@
+[Mesh]
+  type = MeshGeneratorMesh
+
+  [gmg1]
+    type = GeneratedMeshGenerator
+    dim = 2
+    xmin = 0
+    xmax = 1
+    ymin = 0
+    ymax = 1
+    nx = 5
+    ny = 5
+    extra_element_integers = 'material_id'
+  []
+  [gmg2]
+    type = GeneratedMeshGenerator
+    dim = 2
+    xmin = 1
+    xmax = 2
+    ymin = 0
+    ymax = 1
+    nx = 5
+    ny = 5
+    extra_element_integers = 'source_id'
+  []
+  [stitcher]
+    type = StitchedMeshGenerator
+    inputs = 'gmg1 gmg2'
+    stitch_boundaries_pairs = 'right left'
+  []
+  [set_material_id0]
+    type = SubdomainBoundingBoxGenerator
+    input = stitcher
+    bottom_left = '0 0 0'
+    top_right = '1 1 0'
+    block_id = 1
+    location = INSIDE
+    integer_name = material_id
+  []
+  [set_material_id1]
+    type = SubdomainBoundingBoxGenerator
+    input = set_material_id0
+    bottom_left = '1 0 0'
+    top_right = '2 1 0'
+    block_id = 2
+    location = INSIDE
+    integer_name = material_id
+  []
+  [set_material_id2]
+    type = SubdomainBoundingBoxGenerator
+    input = set_material_id1
+    bottom_left = '0 0 0'
+    top_right = '1 1 0'
+    block_id = 3
+    location = INSIDE
+    integer_name = source_id
+  []
+  [set_material_id3]
+    type = SubdomainBoundingBoxGenerator
+    input = set_material_id2
+    bottom_left = '1 0 0'
+    top_right = '2 1 0'
+    block_id = 4
+    location = INSIDE
+    integer_name = source_id
+  []
+[]
+
+[AuxVariables]
+  [id1]
+    family = MONOMIAL
+    order = CONSTANT
+  []
+  [id2]
+    family = MONOMIAL
+    order = CONSTANT
+  []
+[]
+
+[AuxKernels]
+  [id1]
+    type = ElementIntegerAux
+    variable = id1
+    integer_names = material_id
+  []
+  [id2]
+    type = ElementIntegerAux
+    variable = id2
+    integer_names = source_id
+  []
+[]
+
+[Problem]
+  solve = false
+[]
+
+[Executioner]
+  type = Steady
+[]
+
+[Outputs]
+  exodus = true
+[]

test/tests/mesh/multi_elem_integers/tests

@@ -0,0 +1,10 @@
+[Tests]
+  issues = '#13764'
+  design = 'syntax/Mesh/index.md'
+  [./mesh_integer]
+    type = 'Exodiff'
+    input = 'multi_element_integer.i'
+    exodiff = 'multi_element_integer_out.e'
+    requirement = "MOOSE shall generate meshes with different set of element integers and properly stitch them."
+  [../]
+[]