Add tests for improvements to MultiAppCopyTransfer

(refs idaholab#13754)

test/tests/transfers/multiapp_copy_transfer/aux_to_aux/from_sub.i

@@ -0,0 +1,34 @@
+[Problem]
+  solve = false
+[]
+
+[Mesh]
+  type = GeneratedMesh
+  dim = 2
+[]
+
+[MultiApps/sub]
+  type = TransientMultiApp
+  input_files = sub.i
+[]
+
+[Transfers/from_sub]
+  type = MultiAppCopyTransfer
+  direction = from_multiapp
+  multi_app = sub
+  source_variable = aux
+  variable = x
+[]
+
+[AuxVariables/x]
+[]
+
+[Executioner]
+  type = Transient
+  num_steps = 1
+[]
+
+[Outputs]
+  execute_on = 'FINAL'
+  exodus = true
+[]

test/tests/transfers/multiapp_copy_transfer/aux_to_aux/sub.i

@@ -0,0 +1,22 @@
+[Problem]
+  type = FEProblem
+  solve = false
+[]
+
+[Mesh]
+  type = GeneratedMesh
+  dim = 2
+[]
+
+[AuxVariables/aux]
+  initial_condition = 1980
+[]
+
+[Executioner]
+  type = Transient
+[]
+
+[Outputs]
+  execute_on = 'FINAL'
+  exodus = true
+[]

test/tests/transfers/multiapp_copy_transfer/aux_to_aux/tests

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+[Tests]
+  issues = '#13754'
+  design = 'MultiAppCopyTransfer.md'
+
+  [transfer]
+    requirement = "The system shall support the transfer of auxiliary field variables between identical meshes:"
+    [from_sub_to_master]
+      type = Exodiff
+      input = from_sub.i
+      exodiff = 'from_sub_out.e from_sub_out_sub0.e'
+
+      detail = 'from a sub-application and'
+    []
+
+    [to_sub_to_master]
+      type = Exodiff
+      input = to_sub.i
+      exodiff = 'to_sub_out.e to_sub_out_sub0.e'
+
+      detail = 'to a sub-application.'
+    []
+  []
+
+  [errors]
+    requirement = "The system shall error if a variable, during a direct copy of auxiliary field variables, does not exist"
+    [error_from_sub_to_master]
+      type = RunException
+      input = from_sub.i
+      cli_args = 'sub0:AuxVariables/active="" sub0:Outputs/exodus=false'
+      expect_err = "The variable 'aux' does not exist."
+
+      detail = "in the sub-application when transferring form it and"
+    []
+
+    [error_to_sub_to_master]
+      type = RunException
+      input = to_sub.i
+      cli_args = 'AuxVariables/active="" Outputs/exodus=false'
+      expect_err = "The variable 'x' does not exist."
+
+      detail = "in the master application when transferring for it."
+    []
+  []
+[]

test/tests/transfers/multiapp_copy_transfer/aux_to_aux/to_sub.i

@@ -0,0 +1,35 @@
+[Problem]
+  solve = false
+[]
+
+[Mesh]
+  type = GeneratedMesh
+  dim = 2
+[]
+
+[MultiApps/sub]
+  type = TransientMultiApp
+  input_files = sub.i
+[]
+
+[Transfers/from_sub]
+  type = MultiAppCopyTransfer
+  direction = to_multiapp
+  multi_app = sub
+  source_variable = x
+  variable = aux
+[]
+
+[AuxVariables/x]
+  initial_condition = 1949
+[]
+
+[Executioner]
+  type = Transient
+  num_steps = 1
+[]
+
+[Outputs]
+  execute_on = 'FINAL'
+  exodus = true
+[]