Added WASI integration tests

Makefile

@@ -25,6 +25,7 @@ integration-tests: release
 	echo "Running Integration Tests"
 	./integration_tests/lua/test.sh
 	./integration_tests/nginx/test.sh
+	./integration_tests/cowsay/test.sh
 
 lint:
 	cargo fmt --all -- --check

integration_tests/cowsay/README.md

@@ -0,0 +1,9 @@
+# `cowsay` integration test
+
+
+This starts Wasmer with the Cowsay WASI Wasm file. The test makes assertions on
+the output of Wasmer. Run test with:
+
+```bash
+./integration_tests/cowsay/test.sh
+```

integration_tests/cowsay/test.sh

@@ -0,0 +1,14 @@
+#! /bin/bash
+
+nohup ./target/release/wasmer run examples/cowsay.wasm --disable-cache -- "hello integration"
+
+if grep "hello integration" ./nohup.out
+then
+    echo "cowsay wasi integration test succeeded"
+    rm ./nohup.out
+    exit 0
+else
+    echo "cowsay wasi integration test failed"
+    rm ./nohup.out
+    exit -1
+fi