Add a test for Samply.

Author: nnethercote

.github/workflows/ci.yml

@@ -175,7 +175,9 @@ jobs:
           echo "${PWD}/build/bin" >> $GITHUB_PATH
 
       - name: Install profilers
-        run: cargo install --version 0.4.12 cargo-llvm-lines
+        run: |
+          cargo install --version 0.4.12 cargo-llvm-lines
+          cargo install samply
 
       - name: Install Bytehound
         run: |

ci/check-profiling.sh

@@ -39,6 +39,18 @@ cargo build -p collector --bin rustc-fake
 # oprofile: untested... it's not used much, and might have the same problems
 # that `perf` has due to virtualized hardware.
 
+RUST_BACKTRACE=1 RUST_LOG=raw_cargo_messages=trace,collector=debug,rust_sysroot=debug \
+    cargo run -p collector --bin collector -- \
+    profile_local samply $bindir/rustc \
+        --id Test \
+        --profiles Check \
+        --cargo $bindir/cargo \
+        --include helloworld \
+        --scenarios Full
+test -f results/samply-Test-helloworld-Check-Full
+# Samply output files are JSON, the first field is called "meta".
+grep -q "meta" results/samply-Test-helloworld-Check-Full
+
 # Cachegrind.
 RUST_BACKTRACE=1 RUST_LOG=raw_cargo_messages=trace,collector=debug,rust_sysroot=debug \
     cargo run -p collector --bin collector -- \