Reduce track-level runtests.jl output

Inspired by #680 and #686

runtests.jl

@@ -9,32 +9,33 @@ get(ENV, "GITHUB_ACTIONS", "false") == "true" && global_logger(GitHubActionsLogg
 
 include("eachexercise.jl")
 
-eachexercise(ARGS) do exercise, exercise_type, exercise_path, example_path
-    # Skip exercise tests if the Julia version doesn't meet the required version as specified in .meta/config.json
-    cfg = JSON.parsefile(joinpath(exercise_path, ".meta", "config.json"))
-    required_version_spec = Pkg.Types.semver_spec(get(cfg, "language_versions", "1.0"))
-    if VERSION ∉ required_version_spec
-        @info "$exercise requires Julia $required_version_spec, skipping tests."
-        println()
-        return
-    end
-
-    # Create an anonymous module so that exercises are tested in separate scopes
-    m = Module()
+@testset "exemplars" begin
+    eachexercise(ARGS) do exercise, exercise_type, exercise_path, example_path
+        @testset "$exercise" begin
+            # Skip exercise tests if the Julia version doesn't meet the required version as specified in .meta/config.json
+            cfg = JSON.parsefile(joinpath(exercise_path, ".meta", "config.json"))
+            required_version_spec = Pkg.Types.semver_spec(get(cfg, "language_versions", "1.0"))
+            if VERSION ∉ required_version_spec
+                @info "$exercise requires Julia $required_version_spec, skipping tests."
+                println()
+                return
+            end
 
-    # When testing the example solution, all tests must pass, even those that are marked as skipped or broken.
-    # The student will not be affected by this.
-    # Overwrite @test_skip and @test_broken with @test
-    @eval m using Test
-    @eval m $(Symbol("@test_skip")) = $(Symbol("@test"))
-    @eval m $(Symbol("@test_broken")) = $(Symbol("@test"))
+            # Create an anonymous module so that exercises are tested in separate scopes
+            m = Module()
 
-    # runtests.jl includes the solution by calling `include("slug.jl")`
-    # Our anonymous module doesn't have `include(s::String)` defined,
-    # so we define our own.
-    @eval m include(s) = Base.include($m, $example_path)
-    @info "[$(uppercase(exercise_type))] Testing $exercise"
-    Base.include(m, joinpath(exercise_path, "runtests.jl"))
+            # When testing the example solution, all tests must pass, even those that are marked as skipped or broken.
+            # So we overwrite @test_skip and @test_broken with @test to enable those tests.
+            @eval m using Test
+            @eval m $(Symbol("@test_skip")) = $(Symbol("@test"))
+            @eval m $(Symbol("@test_broken")) = $(Symbol("@test"))
 
-    println() # to make the output more readable
+            # runtests.jl includes the solution by calling `include("slug.jl")`
+            # Our anonymous module doesn't have `include(s::String)` defined,
+            # so we define our own.
+            @eval m include(s) = Base.include($m, $example_path)
+            @info "[$(uppercase(exercise_type))] Testing $exercise"
+            Base.include(m, joinpath(exercise_path, "runtests.jl"))
+        end
+    end
 end