diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 9427716..064e468 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -1,26 +1,17 @@
-name: Run tests
+name: Github Actions
 on: [push, pull_request]
 jobs:
   build:
-    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, windows-latest]
+
+    runs-on: ${{ matrix.os }}
 
     steps:
-    - uses: actions/checkout@v1
-
-    - name: Cache choosenim
-      id: cache-choosenim
-      uses: actions/cache@v1
-      with:
-        path: ~/.choosenim
-        key: ${{ runner.os }}-choosenim-stable
-
-    - name: Cache nimble
-      id: cache-nimble
-      uses: actions/cache@v1
-      with:
-        path: ~/.nimble
-        key: ${{ runner.os }}-nimble-stable
-
+    - uses: actions/checkout@v2
     - uses: jiro4989/setup-nim-action@v1
-
-    - run: nimble test -y
+    - run: nimble test -d:release -y
+    - run: nimble test --gc:orc -d:release -y
+    - run: nim cpp -d:release -r tests/all.nim
diff --git a/README.md b/README.md
index ff827ea..d2779e1 100644
--- a/README.md
+++ b/README.md
@@ -8,6 +8,8 @@ This library is being actively developed and we'd be happy for you to use it.
 
 `nimble install pixie`
 
+![Github Actions](https://github.com/treeform/pixie/workflows/Github%20Actions/badge.svg)
+
 Features:
 * Typesetting and rasterizing text, including styled rich text via spans.
 * Drawing paths, shapes and curves with even-odd and non-zero windings.
diff --git a/src/pixie/fontformats/opentype.nim b/src/pixie/fontformats/opentype.nim
index 84d7f34..bb38f6e 100644
--- a/src/pixie/fontformats/opentype.nim
+++ b/src/pixie/fontformats/opentype.nim
@@ -1,5 +1,4 @@
-import flatty/binny, math, pixie/common, pixie/paths, sets, tables,
-    unicode, vmath
+import flatty/binny, math, pixie/common, pixie/paths, sets, tables, unicode, vmath
 
 ## See https://docs.microsoft.com/en-us/typography/opentype/spec/
 
diff --git a/tests/all.nim b/tests/all.nim
new file mode 100644
index 0000000..1a4e9f1
--- /dev/null
+++ b/tests/all.nim
@@ -0,0 +1,2 @@
+import test_bmp, test_context, test_fonts, test_gif, test_images,
+    test_images_draw, test_jpg, test_masks, test_paints, test_paths, test_png, test_svg
diff --git a/tests/images/context/clearRect_1.png b/tests/images/context/clearRect_1.png
index 994056e..80156ec 100644
Binary files a/tests/images/context/clearRect_1.png and b/tests/images/context/clearRect_1.png differ