fuzz: add contrib/test.sh so we at least 'cargo test' it in CI

contrib/test.sh

@@ -2,7 +2,7 @@
 
 set -ex
 
-CRATES="bitcoin hashes internals"
+CRATES="bitcoin hashes internals fuzz"
 
 for crate in ${CRATES}
 do

fuzz/contrib/test.sh

@@ -0,0 +1,44 @@
+#!/bin/sh
+
+set -ex
+
+FEATURES=""
+
+cargo --version
+rustc --version
+
+# Make all cargo invocations verbose
+export CARGO_TERM_VERBOSE=true
+
+# Pin dependencies as required if we are using MSRV toolchain.
+if cargo --version | grep "1\.41"; then
+    # 1.0.157 uses syn 2.0 which requires edition 2021
+    cargo update -p serde --precise 1.0.156
+    # 1.0.108 uses `matches!` macro so does not work with Rust 1.41.1, bad `syn` no biscuit.
+    cargo update -p syn --precise 1.0.107
+    # Half 1.8 uses edition 2021 features
+    cargo update -p half --precise 1.7.1
+fi
+
+if [ "$DO_LINT" = true ]
+then
+    cargo clippy --all-features --all-targets -- -D warnings
+fi
+
+# Defaults / sanity checks
+cargo build
+cargo test
+
+# Address Sanitizer
+if [ "$DO_ASAN" = true ]; then
+    cargo clean
+    CC='clang -fsanitize=address -fno-omit-frame-pointer'                                        \
+    RUSTFLAGS='-Zsanitizer=address -Clinker=clang -Cforce-frame-pointers=yes'                    \
+    ASAN_OPTIONS='detect_leaks=1 detect_invalid_pointer_pairs=1 detect_stack_use_after_return=1' \
+    cargo test --lib --no-default-features --features="$FEATURES" -Zbuild-std --target x86_64-unknown-linux-gnu
+    cargo clean
+    CC='clang -fsanitize=memory -fno-omit-frame-pointer'                                         \
+    RUSTFLAGS='-Zsanitizer=memory -Zsanitizer-memory-track-origins -Cforce-frame-pointers=yes'   \
+    cargo test --lib --no-default-features --features="$FEATURES" -Zbuild-std --target x86_64-unknown-linux-gnu
+fi
+