Core: Add a test suite (#9297)

Adds a test suite for testing hyprland's features with a runtime tester

---------

Co-authored-by: Mihai Fufezan <mihai@fufexan.net>

.github/workflows/nix-build.yml

@@ -29,17 +29,17 @@ jobs:
         uses: nix-community/cache-nix-action@v6
         with:
           # restore and save a cache using this key
-          primary-key: nix-${{ runner.os }}-${{ hashFiles('**/*.nix', '**/flake.lock') }}
+          primary-key: nix-${{ runner.os }}
           # if there's no cache hit, restore a cache by this prefix
-          restore-prefixes-first-match: nix-${{ runner.os }}-
+          restore-prefixes-first-match: nix-${{ runner.os }}
           # collect garbage until the Nix store size (in bytes) is at most this number
           # before trying to save a new cache
           # 1G = 1073741824
-          gc-max-store-size-linux: 1G
+          gc-max-store-size-linux: 5G
           # do purge caches
           purge: true
           # purge all versions of the cache
-          purge-prefixes: nix-${{ runner.os }}-
+          purge-prefixes: nix-${{ runner.os }}
           # created more than this number of seconds ago
           purge-created: 0
           # or, last accessed more than this number of seconds ago

.github/workflows/nix-ci.yml

@@ -12,3 +12,9 @@ jobs:
     if: (github.event_name != 'pull_request' || github.event.pull_request.head.repo.fork)
     uses: ./.github/workflows/nix-build.yml
     secrets: inherit
+
+  test:
+    if: (github.event_name != 'pull_request' || github.event.pull_request.head.repo.fork)
+    needs: build
+    uses: ./.github/workflows/nix-test.yml
+    secrets: inherit

.github/workflows/nix-test.yml

@@ -0,0 +1,59 @@
+name: Nix (Test)
+
+on:
+  workflow_call:
+    secrets:
+      CACHIX_AUTH_TOKEN:
+        required: false
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Install Nix
+        uses: nixbuild/nix-quick-install-action@v31
+        with:
+          nix_conf: |
+            keep-env-derivations = true
+            keep-outputs = true
+
+      - name: Restore and save Nix store
+        uses: nix-community/cache-nix-action@v6
+        with:
+          # restore and save a cache using this key
+          primary-key: nix-${{ runner.os }}
+          # if there's no cache hit, restore a cache by this prefix
+          restore-prefixes-first-match: nix-${{ runner.os }}
+          # collect garbage until the Nix store size (in bytes) is at most this number
+          # before trying to save a new cache
+          # 1G = 1073741824
+          gc-max-store-size-linux: 5G
+          # do purge caches
+          purge: true
+          # purge all versions of the cache
+          purge-prefixes: nix-${{ runner.os }}
+          # created more than this number of seconds ago
+          purge-created: 0
+          # or, last accessed more than this number of seconds ago
+          # relative to the start of the `Post Restore and save Nix store` phase
+          purge-last-accessed: 0
+          # except any version with the key that is the same as the `primary-key`
+          purge-primary-key: never
+
+      - uses: cachix/cachix-action@v15
+        with:
+          name: hyprland
+          authToken: "${{ secrets.CACHIX_AUTH_TOKEN }}"
+
+      - name: Run test VM
+        run: nix build 'github:hyprwm/Hyprland?ref=${{ github.ref }}#checks.x86_64-linux.tests' -L --extra-substituters "https://hyprland.cachix.org"
+
+      - name: Check exit status
+        run: grep 0 result/exit_status
+
+      - name: Upload artifacts
+        if: always()
+        uses: actions/upload-artifact@v4
+        with:
+          name: logs
+          path: result