More example-tests (#258)

* Add assertions to compute example

* add testable triangle example

* make importable

* fiz

* sigh - this is why I'm not a fan of pathlib...

* add ci-generated screenshot

* I wonder if this changes the order ...

.github/workflows/ci.yml

@@ -108,7 +108,7 @@ jobs:
           pytest -v wgpu/__pyinstaller
 
   test-examples-build:
-    name: Test examples
+    name: Test Examples
     runs-on: ubuntu-latest
     strategy:
       fail-fast: false

examples/compute_noop.py

@@ -44,8 +44,9 @@
 
 # The result is a dict matching the output types
 # Select data from buffer at binding 1
-result = out[1]
-print(result.tolist())
+result = out[1].tolist()
+print(result)
+assert result == list(range(20))
 
 
 # %% The short version, using numpy
@@ -118,5 +119,7 @@
 
 # Read result
 # result = buffer2.read_data().cast("i")
-result = device.queue.read_buffer(buffer2).cast("i")
-print(result.tolist())
+out = device.queue.read_buffer(buffer2).cast("i")
+result = out.tolist()
+print(result)
+assert result == list(range(20))

examples/triangle_auto.py

@@ -0,0 +1,22 @@
+"""
+Import the viz from triangle.py and run it using the auto-gui.
+"""
+# test_example = true
+
+import sys
+from pathlib import Path
+
+from wgpu.gui.auto import WgpuCanvas, run
+import wgpu.backends.rs  # noqa: F401, Select Rust backend
+
+sys.path.insert(0, str(Path(__file__).parent))
+
+from triangle import main  # noqa: E402, The function to call to run the visualization
+
+
+canvas = WgpuCanvas()
+device = main(canvas)
+
+
+if __name__ == "__main__":
+    run()