Add CI test workflow

.github/workflows/test.yaml

@@ -0,0 +1,31 @@
+name: Build & test
+
+on:
+  push:
+    paths: [ ".github/workflows/**", "**/*.rs", "**/Cargo.toml", "**/.cargo/config.toml" ]
+  pull_request:
+    paths: [ "**/*.rs", "**/Cargo.toml", "**/.cargo/config.toml" ]
+    branches: [ "main" ]
+
+env:
+  CARGO_TERM_COLOR: always
+  CARGO_PROFILE: release-debuginfo
+
+jobs:
+  build:
+    strategy:
+      matrix:
+        os:
+        - macos-latest
+        - ubuntu-latest
+
+    runs-on: ${{matrix.os}}
+
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: Build
+      run: cargo build --verbose --profile ${{env.CARGO_PROFILE}}
+
+    - name: Run tests
+      run: cargo test --verbose --profile ${{env.CARGO_PROFILE}}

README.md

@@ -62,7 +62,7 @@ main:
  * API updates, enough public constructs to roll a custom help writer.
  * Generalised internal error & usage into `StandardErrorUsageWriter` for reuse outside the easy API & in `no_std`.
  * Fixed uncontrollable newlines in user display in easy API.
- * More tests for validating internal behaviour.
+ * More tests for validating internal behaviour & enabled CI on GitHub.
 
 v0.1.1:
  * Fixed incorrect error message format for coerced parsing errors.
@@ -78,7 +78,6 @@ Near future:
  * Actual `no_std` tests & examples.
  * More control over parsing behaviour (getopt style, no special casing shorts for Windows style flags, etc.)
  * More practical examples.
- * CI on main GitHub.
 
 Long term:
  * Strategy for handling exclusive argument groups.