diff --git a/util/clean.sh b/util/clean.sh
index e100024bc..da76d22d3 100755
--- a/util/clean.sh
+++ b/util/clean.sh
@@ -31,6 +31,7 @@ if [[ "$1" == "--all" || "$1" == "--more" ]]; then
         $DIR_PREFIX \
         $DIR_DIST_OUT \
         $DIR_DIST_WORK \
+        $DIR_TESTS_LIB_WASM
     remove_luarocks
     cargo clean --manifest-path lib/Cargo.toml
     cargo clean --manifest-path t/lib/Cargo.toml
diff --git a/util/sdk.sh b/util/sdk.sh
index caf123adf..ab2517e42 100755
--- a/util/sdk.sh
+++ b/util/sdk.sh
@@ -42,6 +42,9 @@ Options:
 
   --build                   Build a Proxy-Wasm SDK and example filters.
 
+  --install                 Copy all compiled Proxy-Wasm SDK example filters
+                            to work/lib/wasm for test suites.
+
   -V, --sdk-ver <ver>       Proxy-Wasm SDK version to build (e.g. '0.2.1')
 
   -f, --force, --clean      Force a clean build with --build,
@@ -72,6 +75,9 @@ while [[ "$1" ]]; do
         --build)
             MODE="build"
             ;;
+        --install)
+            MODE="install"
+            ;;
         --clean|--force|-f)
             CLEAN="clean"
             ;;
diff --git a/util/sdks/assemblyscript.sh b/util/sdks/assemblyscript.sh
index 45962f82a..31881303a 100755
--- a/util/sdks/assemblyscript.sh
+++ b/util/sdks/assemblyscript.sh
@@ -112,7 +112,12 @@ clean="$3"
 if [ "$mode" = "download" ]; then
     download_assemblyscript_sdk "$version" "$clean"
 
-else
+elif [ "$mode" = "build" ]; then
     build_assemblyscript_sdk "$version" "$clean"
+
+elif [ "$mode" = "install" ]; then
     install_assemblyscript_sdk_examples
+
+else
+    fatal "Unknown mode."
 fi
diff --git a/util/sdks/go.sh b/util/sdks/go.sh
index acb771ef9..8482f25be 100755
--- a/util/sdks/go.sh
+++ b/util/sdks/go.sh
@@ -131,7 +131,12 @@ clean="$3"
 if [ "$mode" = "download" ]; then
     download_go_sdk "$version" "$clean"
 
-else
+elif [ "$mode" = "build" ]; then
     build_go_sdk "$version" "$clean"
+
+elif [ "$mode" = "install" ]; then
     install_go_sdk_examples
+
+else
+    fatal "Unknown mode."
 fi
diff --git a/util/setup_dev.sh b/util/setup_dev.sh
index 6918178bc..02f19fbc2 100755
--- a/util/setup_dev.sh
+++ b/util/setup_dev.sh
@@ -15,7 +15,7 @@ source $NGX_WASM_DIR/util/_lib.sh
 
 ###############################################################################
 
-mkdir -p $DIR_CPANM $DIR_BIN $DIR_TESTS_LIB_WASM
+mkdir -p $DIR_CPANM $DIR_BIN
 
 # OpenSSL
 
diff --git a/util/test.sh b/util/test.sh
index f121907e5..0c4b748fc 100755
--- a/util/test.sh
+++ b/util/test.sh
@@ -94,6 +94,8 @@ if [[ "$CI" == 'true' ]]; then
     export NGX_BUILD_FORCE=1
 fi
 
+mkdir -p $DIR_TESTS_LIB_WASM
+
 args=()
 
 if [ "$TEST_NGINX_CARGO_PROFILE" = release ]; then
@@ -104,15 +106,14 @@ export RUSTFLAGS="$TEST_NGINX_CARGO_RUSTFLAGS"
 eval cargo build \
     --manifest-path t/lib/Cargo.toml \
     --lib \
-    "${args[@]}" \
-    --target wasm32-wasi
+    --target wasm32-wasi \
+    "${args[@]}"
 
-if [ "$TEST_NGINX_CARGO_PROFILE" = release ]; then
-    cp target/wasm32-wasi/release/*.wasm $DIR_TESTS_LIB_WASM
+eval cp t/lib/target/wasm32-wasi/$TEST_NGINX_CARGO_PROFILE/*.wasm \
+    $DIR_TESTS_LIB_WASM
 
-else
-    cp target/wasm32-wasi/debug/*.wasm $DIR_TESTS_LIB_WASM
-fi
+$NGX_WASM_DIR/util/sdk.sh -S go --install
+$NGX_WASM_DIR/util/sdk.sh -S assemblyscript --install
 
 if [ $(uname -s) = Linux ]; then
     export TEST_NGINX_EVENT_TYPE=epoll