Add a test that uses setData() ref idaholab#14220

test/include/functions/HardCodedPiecewiseLinearFunction.h

@@ -0,0 +1,20 @@
+//* This file is part of the MOOSE framework
+//* https://www.mooseframework.org
+//*
+//* All rights reserved, see COPYRIGHT for full restrictions
+//* https://github.com/idaholab/moose/blob/master/COPYRIGHT
+//*
+//* Licensed under LGPL 2.1, please see LICENSE for details
+//* https://www.gnu.org/licenses/lgpl-2.1.html
+
+#pragma once
+
+#include "PiecewiseLinearBase.h"
+
+class HardCodedPiecewiseLinearFunction : public PiecewiseLinearBase
+{
+public:
+  static InputParameters validParams();
+
+  HardCodedPiecewiseLinearFunction(const InputParameters & parameters);
+};

test/src/functions/HardCodedPiecewiseLinearFunction.C

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+//* This file is part of the MOOSE framework
+//* https://www.mooseframework.org
+//*
+//* All rights reserved, see COPYRIGHT for full restrictions
+//* https://github.com/idaholab/moose/blob/master/COPYRIGHT
+//*
+//* Licensed under LGPL 2.1, please see LICENSE for details
+//* https://www.gnu.org/licenses/lgpl-2.1.html
+
+#include "HardCodedPiecewiseLinearFunction.h"
+
+registerMooseObject("MooseTestApp", HardCodedPiecewiseLinearFunction);
+
+InputParameters
+HardCodedPiecewiseLinearFunction::validParams()
+{
+  InputParameters params = PiecewiseLinearBase::validParams();
+  params.set<std::vector<Real>>("xy_data") = {}; // Avoids error in base class constructor
+  params.addClassDescription("Class to test using setData() to set xy data in a Piecewise function");
+  return params;
+}
+
+HardCodedPiecewiseLinearFunction::HardCodedPiecewiseLinearFunction(const InputParameters & parameters) : PiecewiseLinearBase(parameters)
+{
+  const std::vector<Real> x = {0, 1, 2};
+  const std::vector<Real> y = {3, 1, 6};
+  setData(x, y);
+}

test/tests/functions/hardcoded_piecewise_linear/gold/hardcoded_piecewise_linear_out.csv

@@ -0,0 +1,5 @@
+time,end1_pp
+0.5,2
+1,1
+1.5,3.5
+2,6

test/tests/functions/hardcoded_piecewise_linear/hardcoded_piecewise_linear.i

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+# This test ensures that hardcoded_function returns the expected
+# time-dependent values. The HardCodedPiecewiseLinearFunction is
+# a test object whose purpose is to ensure that the setData() method
+# can be used in Piecewise functions to directly set the xy data.
+[Mesh]
+  type = GeneratedMesh
+  dim = 1
+  xmin = 0
+  xmax = 1
+  nx = 1
+[]
+
+[Problem]
+  solve = false
+[]
+
+[AuxVariables]
+  [funcval]
+  []
+[]
+
+[AuxKernels]
+  [funcval]
+    type = FunctionAux
+    variable = funcval
+    function = hardcoded_function
+    execute_on = 'initial timestep_end'
+  []
+[]
+
+
+[Functions]
+  [hardcoded_function]
+    type = HardCodedPiecewiseLinearFunction
+  []
+[]
+
+[Postprocessors]
+  [end1_pp]
+    type = ElementalVariableValue
+    variable = funcval
+    elementid = 0
+    execute_on = 'initial timestep_end'
+  [../]
+[]
+
+[Executioner]
+  type = Transient
+  dt = 0.5
+  end_time = 2
+[]
+
+[Outputs]
+  execute_on = 'timestep_end'
+  exodus = false
+  csv = true
+[]

test/tests/functions/hardcoded_piecewise_linear/tests

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+[Tests]
+  design = 'PiecewiseLinear.md'
+  [./steady]
+    type = 'CSVDiff'
+    input = 'hardcoded_piecewise_linear.i'
+    exodiff = 'hardcoded_piecewise_linear_out.csv'
+    requirement = "The Function system shall allow for piecewise functions to directly set the xy data internally"
+    issues = '#14220'
+  [../]
+[]