CI: Standardize the workflow for testing and changing the UUID

.ci/test_and_change_uuid.jl

@@ -0,0 +1,28 @@
+@static if Base.VERSION >= v"1.6"
+    using TOML
+    using Test
+else
+    using Pkg: TOML
+    using Test
+end
+
+# To generate the new UUID, we simply modify the first character of the original UUID
+const original_uuid = "10745b16-79ce-11e8-11f9-7d13ad32a3b2"
+const new_uuid      = "20745b16-79ce-11e8-11f9-7d13ad32a3b2"
+
+# `@__DIR__` is the `.ci/` folder.
+# Therefore, `dirname(@__DIR__)` is the repository root.
+const project_filename = joinpath(dirname(@__DIR__), "Project.toml")
+
+@testset "Test that the UUID is unchanged" begin
+    project_dict = TOML.parsefile(project_filename)
+    @test project_dict["uuid"] == original_uuid
+end
+
+write(
+    project_filename,
+    replace(
+        read(project_filename, String),
+        r"uuid = .*?\n" => "uuid = \"$(new_uuid)\"\n",
+    ),
+)

.github/workflows/ci.yml

@@ -40,11 +40,9 @@ jobs:
             ${{ runner.os }}-test-${{ env.cache-name }}-
             ${{ runner.os }}-test-
             ${{ runner.os }}-
+      - run: julia --color=yes .ci/test_and_change_uuid.jl
       - uses: julia-actions/julia-buildpkg@v1
-      - name: Run tests
-        run: |
-          julia --project --color=yes -e 'using UUIDs; write("Project.toml", replace(read("Project.toml", String), r"uuid = .*?\n" =>"uuid = \"$(uuid4())\"\n"));'
-          julia --project --color=yes --check-bounds=yes -e 'import Pkg; Pkg.build(); Pkg.test(; coverage=true)'
+      - uses: julia-actions/julia-runtest@v1
       - uses: julia-actions/julia-processcoverage@v1
       - uses: codecov/codecov-action@v1
         with: