Run the examples as tests

.forgejo/workflows/continuous-integration.yaml

@@ -17,7 +17,8 @@ jobs:
       - run: RUSTFLAGS='-D warnings' trunk build
   
   # run the automated tests, reporting success if the tests pass and were built
-  # without warnings
+  # without warnings. the examples are run as tests, because we've configured
+  # each example target with `test = true` and `harness = false` in Cargo.toml
   test:
     runs-on: docker
     container:
@@ -27,24 +28,4 @@ jobs:
         working-directory: app-proto
     steps:
       - uses: https://code.forgejo.org/actions/checkout@v4
-      - run: RUSTFLAGS='-D warnings' cargo test
-  
-  # run the Cargo examples, as described here:
-  #
-  #   Karol Kuczmarski. "Add examples to your Rust libraries"
-  #   http://xion.io/post/code/rust-examples.html
-  #
-  # report success if the examples build and run without errors or warnings
-  run-examples:
-    runs-on: docker
-    container:
-      image: cimg/rust:1.85-node
-    defaults:
-      run:
-        working-directory: app-proto
-    steps:
-      - uses: https://code.forgejo.org/actions/checkout@v4
-      - run: RUSTFLAGS='-D warnings' cargo run --example irisawa-hexlet
-      - run: RUSTFLAGS='-D warnings' cargo run --example three-spheres
-      - run: RUSTFLAGS='-D warnings' cargo run --example point-on-sphere
-      - run: RUSTFLAGS='-D warnings' cargo run --example kaleidocycle
+      - run: RUSTFLAGS='-D warnings' cargo test

app-proto/Cargo.toml

@@ -50,3 +50,23 @@ wasm-bindgen-test = "0.3.34"
 [profile.release]
 opt-level = "s" # optimize for small code size
 debug = true # include debug symbols
+
+[[example]]
+name = "irisawa-hexlet"
+test = true
+harness = false
+
+[[example]]
+name = "kaleidocycle"
+test = true
+harness = false
+
+[[example]]
+name = "point-on-sphere"
+test = true
+harness = false
+
+[[example]]
+name = "three-spheres"
+test = true
+harness = false