Add kittest snapshot tests (#71)

* [x] I have followed the instructions in the PR template

---------

Co-authored-by: Emil Ernerfeldt <[email protected]>

Author: lucasmerlin

.gitattributes

@@ -1,2 +1,4 @@
 * text=auto eol=lf
 Cargo.lock linguist-generated=false
+
+*.png filter=lfs diff=lfs merge=lfs -text

.github/workflows/rust.yml

@@ -27,7 +27,7 @@ jobs:
 
       - name: Install packages (Linux)
         if: runner.os == 'Linux'
-        uses: awalsh128/[email protected].2
+        uses: awalsh128/[email protected].3
         with:
           packages: libxcb-render0-dev libxcb-shape0-dev libxcb-xfixes0-dev libxkbcommon-dev libssl-dev libgtk-3-dev # libgtk-3-dev is used by rfd
           version: 1.0
@@ -63,12 +63,6 @@ jobs:
           command: check
           args: --no-default-features --lib --all-targets
 
-      - name: Test doc-tests
-        uses: actions-rs/cargo@v1
-        with:
-          command: test
-          args: --doc --all-features
-
       - name: cargo doc --lib
         uses: actions-rs/cargo@v1
         with:
@@ -81,18 +75,6 @@ jobs:
           command: doc
           args: --document-private-items --no-deps --all-features
 
-      - name: Build tests
-        uses: actions-rs/cargo@v1
-        with:
-          command: test
-          args: --all-features --no-run
-
-      - name: Run test
-        uses: actions-rs/cargo@v1
-        with:
-          command: test
-          args: --all-features
-
       - name: Clippy
         uses: actions-rs/cargo@v1
         with:
@@ -158,3 +140,35 @@ jobs:
         run: wget -qO- https://github.com/thedodd/trunk/releases/latest/download/trunk-x86_64-unknown-linux-gnu.tar.gz | tar -xzf-
       - name: Build
         run: cd demo && ../trunk build
+
+  # ---------------------------------------------------------------------------
+
+  tests:
+    name: Run tests
+    # We run the tests on macOS because it will run with an actual GPU,
+    # which is needed by the egui_kittest snapshot tests.
+    runs-on: macos-latest
+
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          lfs: true
+      - uses: dtolnay/rust-toolchain@master
+        with:
+          toolchain: 1.81.0
+
+      - name: Set up cargo cache
+        uses: Swatinem/rust-cache@v2
+
+      - name: Run tests
+        run: cargo test --all-features
+
+      - name: Run doc-tests
+        run: cargo test --all-features --doc
+
+      - name: Upload artifacts
+        uses: actions/upload-artifact@v4
+        if: always()
+        with:
+          name: test-results
+          path: "**/tests/snapshots"

.gitignore

@@ -11,3 +11,9 @@ target_wasm
 
 # https://github.com/lycheeverse/lychee
 .lycheecache
+
+
+# kittest
+**/tests/snapshots/**/*.diff.png
+**/tests/snapshots/**/*.new.png
+**/tests/snapshots/**/*.old.png