update substitute test

Author: mforets

test/runtests.jl

@@ -25,3 +25,4 @@ using SafeTestsets, Test
 @safetestset "Array of Array Test" begin include("build_function_arrayofarray.jl") end
 #@testset "Latexify recipes Test" begin include("latexify.jl") end
 @testset "Distributed Test" begin include("distributed.jl") end
+@testset "Variable Utils Test" begin include("variable_utils.jl") end

test/variable_utils.jl

@@ -8,6 +8,6 @@ sol = ModelingToolkit.get_variables(expr)
 @parameters γ
 s = α => γ
 expr = (((1 / β - 1) + δ) / α) ^ (1 / (α - 1))
-ModelingToolkit.substitute(expr, s)
+sol = ModelingToolkit.substitute(expr, s)
 new = (((1 / β - 1) + δ) / γ) ^ (1 / (γ - 1))
-@test isequal(expr, new)
+@test iszero(simplify(sol - new))