tests: add an env variable bench for testing

.github/workflows/ci.yml

@@ -48,6 +48,14 @@ jobs:
 
   compat-integration-test-instrumentation:
     runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        build-args:
+          - "-p codspeed"
+          - "-p codspeed-bencher-compat"
+          - "--features async_futures -p codspeed-criterion-compat"
+          - "-p codspeed-divan-compat"
+          - "-p codspeed-divan-compat-examples"
     steps:
       - uses: actions/checkout@v4
         with:
@@ -58,21 +66,24 @@ jobs:
 
       - run: cargo install --path crates/cargo-codspeed --locked
 
-      - run: cargo codspeed build -p codspeed
-      - run: cargo codspeed build -p codspeed-bencher-compat
-      - run: cargo codspeed build --features async_futures -p codspeed-criterion-compat
-
-      - run: cargo codspeed build -p codspeed-divan-compat
-      - run: cargo codspeed build -p codspeed-divan-compat-examples
+      - run: cargo codspeed build ${{ matrix.build-args }}
 
       - name: Run the benchmarks
         uses: CodSpeedHQ/action@main
+        env:
+          MY_ENV_VAR: "YES"
         with:
           run: cargo codspeed run
           token: ${{ secrets.CODSPEED_TOKEN }}
 
   compat-integration-test-walltime:
     runs-on: codspeed-macro
+    strategy:
+      matrix:
+        package:
+          - codspeed-divan-compat
+          - codspeed-divan-compat-examples
+          - codspeed-criterion-compat
     steps:
       - uses: actions/checkout@v4
         with:
@@ -83,12 +94,12 @@ jobs:
 
       - run: cargo install --path crates/cargo-codspeed --locked
 
-      - run: cargo codspeed build -p codspeed-divan-compat
-      - run: cargo codspeed build -p codspeed-divan-compat-examples
-      - run: cargo codspeed build -p codspeed-criterion-compat
+      - run: cargo codspeed build -p ${{ matrix.package }}
 
       - name: Run the benchmarks
         uses: CodSpeedHQ/action@main
+        env:
+          MY_ENV_VAR: "YES"
         with:
           run: cargo codspeed run
           token: ${{ secrets.CODSPEED_TOKEN }}

crates/divan_compat/examples/Cargo.toml

@@ -33,6 +33,10 @@ harness = false
 name = "time_scale"
 harness = false
 
+[[bench]]
+name = "env"
+harness = false
+
 [[bench]]
 name = "the_algorithms"
 harness = false

crates/divan_compat/examples/benches/env.rs

@@ -0,0 +1,9 @@
+fn main() {
+    divan::main();
+}
+
+#[divan::bench]
+fn print_env_hello() {
+    let env_var = std::env::var("MY_ENV_VAR").unwrap_or("not set".to_string());
+    println!("MY_ENV_VAR is {}", env_var);
+}