run integration tests in parallel and properly cache windows build

.github/workflows/ci.yml

@@ -10,15 +10,50 @@ on:
   pull_request:
 
 jobs:
-  ci:
+  unit-tests:
     strategy:
       fail-fast: false
       matrix:
         os:
           - ubuntu-latest
           - windows-latest
+        include:
+          - os: ubuntu-latest
+            cache_path: ~/.cache/go-build
+          - os: windows-latest
+            cache_path: ~\AppData\Local\go-build
     name: ci - ${{matrix.os}}
     runs-on: ${{matrix.os}}
+    env:
+      GOFLAGS: -mod=vendor
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+      - name: Setup Go
+        uses: actions/setup-go@v1
+        with:
+          go-version: 1.18.x
+      - name: Cache build
+        uses: actions/cache@v3
+        with:
+          path: |
+            ${{matrix.cache_path}}
+            ~/go/pkg/mod
+          key: ${{runner.os}}-go-${{hashFiles('**/go.sum')}}-test
+          restore-keys: |
+            ${{runner.os}}-go-
+      - name: Test code
+        # we're passing -short so that we skip the integration tests, which will be run in parallel below
+        run: |
+          go test ./... -short
+  integration-tests:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        parallelism: [5]
+        index: [0,1,2,3,4]
+    name: "Integration Tests (${{ matrix.index }}/${{ matrix.parallelism }})"
     env:
       GOFLAGS: -mod=vendor
     steps:
@@ -37,7 +72,7 @@ jobs:
             ${{runner.os}}-go-
       - name: Test code
         run: |
-          bash ./test.sh
+          PARALLEL_TOTAL=${{ matrix.parallelism }} PARALLEL_INDEX=${{ matrix.index }} go test pkg/gui/gui_test.go
   build:
     runs-on: ubuntu-latest
     env: