Restore the working project after running user code.

Project.toml

@@ -1,7 +1,10 @@
 name = "ParallelTestRunner"
 uuid = "d3525ed8-44d0-4b2c-a655-542cee43accc"
+version = "2.4.1"
 authors = ["Valentin Churavy <v.churavy@gmail.com>"]
-version = "2.4.0"
+
+[workspace]
+projects = ["test"]
 
 [deps]
 Dates = "ade2ca70-3891-5945-98fb-dc099432e06a"

src/ParallelTestRunner.jl

@@ -293,13 +293,18 @@ function runtest(f, name, init_code)
         data = @eval mod begin
             GC.gc(true)
             Random.seed!(1)
+            project = Base.active_project()
 
             # @testset CustomTestRecord switches the all lower-level testset to our custom testset,
             # so we need to have two layers here such that the user-defined testsets are using `DefaultTestSet`.
             # This also guarantees our invariant about `WorkerTestSet` containing a single `DefaultTestSet`.
             stats = @timed @testset WorkerTestSet "placeholder" begin
                 @testset DefaultTestSet $name begin
-                    $f
+                    try
+                        $f
+                    finally
+                        Base.set_active_project(project)
+                    end
                 end
             end
             (; testset=stats.value, stats.time, stats.bytes, stats.gctime)

test/Project.toml

@@ -1,2 +1,7 @@
 [deps]
+ParallelTestRunner = "d3525ed8-44d0-4b2c-a655-542cee43accc"
+Pkg = "44cfe95a-1eb2-52ea-b672-e2afdf69b78f"
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
+
+[sources]
+ParallelTestRunner = {path = ".."}

test/runtests.jl

@@ -373,4 +373,25 @@ end
     @test contains(str, "SUCCESS")
 end
 
+@testset "switching projects" begin
+    testsuite = Dict(
+        "first" => quote
+            using Pkg
+            Pkg.activate(; temp=true)
+            @test 1 + 1 == 2
+        end,
+        "second" => quote
+            @test 2 * 2 == 4
+        end
+    )
+
+    io = IOBuffer()
+    runtests(ParallelTestRunner, ["--verbose", "--jobs=1"]; testsuite, stdout=io, stderr=io)
+
+    str = String(take!(io))
+    @test contains(str, r"first .+ started at")
+    @test contains(str, r"second .+ started at")
+    @test contains(str, "SUCCESS")
+end
+
 end