Add test (idaholab#14220)

test/tests/functions/coarsened_piecewise_linear/coarsened_piecewise_linear.i

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+[Mesh]
+  type = GeneratedMesh
+  dim = 1
+[]
+
+[Variables]
+  [./dummy]
+  [../]
+[]
+
+[Problem]
+  solve = false
+  kernel_coverage_check = false
+[]
+
+[Functions]
+  [./ifa]
+    type = CoarsendPiecewiseLinear
+    data_file = IFA_562_new_conv_kW_power.csv
+    format = columns
+    epsilon = 0.15
+    x_scale = 1e-5
+  [../]
+[]
+
+[VectorPostprocessors]
+  [./F]
+    type = PiecewiseFunctionTabulate
+    function = ifa
+    execute_on = INITIAL
+    outputs = vpp
+  [../]
+[]
+
+[Executioner]
+  type = Transient
+  num_steps = 1
+[]
+
+[Outputs]
+  [./vpp]
+    type = CSV
+    execute_vector_postprocessors_on = INITIAL
+  [../]
+[]

test/tests/functions/coarsened_piecewise_linear/tests

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+[Tests]
+  issues = '#2272'
+  design = 'source/functions/CoarsenedPiecewiseLinear.md'
+  [./test]
+    type = 'CSVDiff'
+    input = 'coarsened_piecewise_linear.i'
+    exodiff = 'coarsened_piecewise_linear_out.csv'
+    requirement = "The Function system shall include an object that creates a function based on x- and y-data pairs and returns an explicit value from the supplied data when queried (i.e., linear interpolation is not performed)."
+  [../]
+[]