[Do Not Merge] Run Julia Base Tests

This is just to see what the current state here is, since I didn't feel
like running this on my Laptop.

.github/workflows/CI.yml → .github/workflows/BaseTests.yml

@@ -1,10 +1,6 @@
-name: CI
+name: Run Julia Base Tests
 on:
   pull_request:
-  push:
-    branches:
-      - master
-    tags: '*'
 jobs:
   test:
     name: Julia ${{ matrix.version }} - ${{ matrix.os }} - ${{ matrix.arch }} - ${{ github.event_name }}
@@ -13,13 +9,9 @@ jobs:
       fail-fast: false
       matrix:
         version:
-          - '1.0'
-          - '1'
           - 'nightly'
         os:
           - ubuntu-latest
-          - macOS-latest
-          - windows-latest
         arch:
           - x64
     env:
@@ -41,8 +33,6 @@ jobs:
             ${{ runner.os }}-test-
             ${{ runner.os }}-
       - uses: julia-actions/julia-buildpkg@v1
-      - uses: julia-actions/julia-runtest@v1
-      - uses: julia-actions/julia-processcoverage@v1
-      - uses: codecov/codecov-action@v1
-        with:
-          file: lcov.info
+      - name: Test Julia Base
+        run: |
+          julia --project test/juliatests.jl

test/juliatests.jl

@@ -12,7 +12,8 @@ const testdir = joinpath(juliadir, "test")
 if isdir(testdir)
     include(joinpath(testdir, "choosetests.jl"))
 else
-    @error "Julia's test/ directory not found, can't run Julia tests"
+    run(`git clone https://github.com/JuliaLang/julia.git`)
+    run(`cp -r julia/test $testdir`)
 end
 
 function test_path(test)