diff --git a/.github/actions/LICENSE b/.github/actions/LICENSE
new file mode 100644
index 0000000..8c295a2
--- /dev/null
+++ b/.github/actions/LICENSE
@@ -0,0 +1,25 @@
+Blargg's Test ROMs by Shay Green <gblargg@gmail.com>
+
+Acid2 tests by Matt Currie under MIT:
+
+MIT License
+
+Copyright (c) 2020 Matt Currie
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
\ No newline at end of file
diff --git a/.github/actions/cgb-acid2.gbc b/.github/actions/cgb-acid2.gbc
new file mode 100644
index 0000000..5f71bd3
Binary files /dev/null and b/.github/actions/cgb-acid2.gbc differ
diff --git a/.github/actions/cgb_sound.gb b/.github/actions/cgb_sound.gb
new file mode 100644
index 0000000..dc50471
Binary files /dev/null and b/.github/actions/cgb_sound.gb differ
diff --git a/.github/actions/dmg-acid2.gb b/.github/actions/dmg-acid2.gb
new file mode 100644
index 0000000..a25ef94
Binary files /dev/null and b/.github/actions/dmg-acid2.gb differ
diff --git a/.github/actions/dmg_sound-2.gb b/.github/actions/dmg_sound-2.gb
new file mode 100755
index 0000000..52dcf70
Binary files /dev/null and b/.github/actions/dmg_sound-2.gb differ
diff --git a/.github/actions/oam_bug-2.gb b/.github/actions/oam_bug-2.gb
new file mode 100755
index 0000000..a3f55af
Binary files /dev/null and b/.github/actions/oam_bug-2.gb differ
diff --git a/.github/actions/sanity_tests.sh b/.github/actions/sanity_tests.sh
new file mode 100755
index 0000000..26fb398
--- /dev/null
+++ b/.github/actions/sanity_tests.sh
@@ -0,0 +1,29 @@
+./build/bin/tester/sameboy_tester --jobs 5 \
+      --length 40 .github/actions/cgb_sound.gb \
+      --length 10  .github/actions/cgb-acid2.gbc \
+      --length 10  .github/actions/dmg-acid2.gb \
+--dmg --length 40 .github/actions/dmg_sound-2.gb \
+--dmg --length 20 .github/actions/oam_bug-2.gb
+
+mv .github/actions/dmg{,-mode}-acid2.bmp
+
+./build/bin/tester/sameboy_tester \
+--dmg --length 10  .github/actions/dmg-acid2.gb 
+
+FAILED_TESTS=`
+shasum .github/actions/*.bmp | grep -E -v \(\
+44ce0c7d49254df0637849c9155080ac7dc3ef3d\ \ .github/actions/cgb-acid2.bmp\|\
+dbcc438dcea13b5d1b80c5cd06bda2592cc5d9e0\ \ .github/actions/cgb_sound.bmp\|\
+0caadf9634e40247ae9c15ff71992e8f77bbf89e\ \ .github/actions/dmg-acid2.bmp\|\
+c50daed36c57a8170ff362042694786676350997\ \ .github/actions/dmg-mode-acid2.bmp\|\
+c9e944b7e01078bdeba1819bc2fa9372b111f52d\ \ .github/actions/dmg_sound-2.bmp\|\
+f0172cc91867d3343fbd113a2bb98100074be0de\ \ .github/actions/oam_bug-2.bmp\
+\)`
+
+if [ -n "$FAILED_TESTS" ] ; then
+    echo "Failed the following tests:"
+    echo $FAILED_TESTS | tr " " "\n" | grep -o -E "[^/]+\.bmp" | sed s/.bmp// | sort
+    exit 1
+fi
+
+echo Passed all tests
\ No newline at end of file
diff --git a/.github/workflows/buildability.yml b/.github/workflows/sanity.yml
similarity index 70%
rename from .github/workflows/buildability.yml
rename to .github/workflows/sanity.yml
index 7cd5298..e0ac132 100644
--- a/.github/workflows/buildability.yml
+++ b/.github/workflows/sanity.yml
@@ -1,4 +1,4 @@
-name: "Bulidability"
+name: "Bulidability and Sanity"
 on: push
 
 jobs:
@@ -23,7 +23,11 @@ jobs:
           ./.github/actions/install_deps.sh ${{ matrix.os }}
       - name: Build
         run: |
-          ${{ matrix.cc }} -v; make sdl libretro ${{ matrix.extra_target }} -j CONF=release CC=${{ matrix.cc }}
+          ${{ matrix.cc }} -v; make sdl tester libretro ${{ matrix.extra_target }} -j CONF=release CC=${{ matrix.cc }}
+      - name: Sanity tests
+        shell: bash
+        run: |
+          ./.github/actions/sanity_tests.sh
       - name: Upload binaries
         uses: actions/upload-artifact@v1
         with: