Use dev version for examples when running tests (#22)

* Use environment variable to toggle dev version for examples when running tests.

NEWS.md

@@ -1,5 +1,9 @@
 # Release notes
 
+## Unversioned
+
+* Use dev version of EMG for examples when running as part of tests, similar to [PR #33 of EMB](https://github.com/EnergyModelsX/EnergyModelsBase.jl/pull/33).
+
 ## Version 0.9.0 (2024-05-24)
 
 ### Update on function calls for dispatching on `modeltype`

examples/network.jl

@@ -1,6 +1,8 @@
 using Pkg
 # Activate the local environment including EnergyModelsGeography, HiGHS, PrettyTables
 Pkg.activate(@__DIR__)
+# Use dev version if run as part of tests
+haskey(ENV, "EMX_TEST") && Pkg.develop(path=joinpath(@__DIR__,".."))
 # Install the dependencies.
 Pkg.instantiate()
 

test/test_examples.jl

@@ -1,15 +1,12 @@
+ENV["EMX_TEST"] = true # Set flag for example scripts to check if they are run as part of the tests
 
 @testset "Run examples" begin
     exdir = joinpath(@__DIR__, "../examples")
-    files = first(walkdir(exdir))[3]
+    files = filter(endswith(".jl"), readdir(exdir))
     for file in files
-        if splitext(file)[2] == ".jl"
-            @testset "Example $file" begin
-                @info "Run example $file"
-                include(joinpath(exdir, file))
-
-                @test termination_status(m) == MOI.OPTIMAL
-            end
+        @testset "Example $file" begin
+            include(joinpath(exdir, file))
+            @test termination_status(m) == MOI.OPTIMAL
         end
     end
     Pkg.activate(@__DIR__)