Allow file system access for tests

Author: SingleAccretion

eng/testing/FindWasmHostExecutable.cmd

@@ -27,7 +27,7 @@ if exist "%__WasmBinaryPathWithoutExtension%.js" (
 
 if "%__WasmBinaryExtension%" == ".wasm" (
   :: Assume wasmtime is in PATH.
-  set WASM_HOST_EXECUTABLE=wasmtime run -S http
+  set WASM_HOST_EXECUTABLE=wasmtime run -S http --dir=.
 ) else (
   if "%NODEJS_EXECUTABLE%" == "" (
     :: When running tests locally, assume NodeJS is in PATH.

eng/testing/FindWasmHostExecutable.sh

@@ -21,6 +21,6 @@ elif [ -e "${dirname}/main.mjs" ]; then
   WASM_HOST_EXECUTABLE=$node
   WASM_BINARY_TO_EXECUTE="${dirname}/main.mjs"
 elif [ -e "${dirname}/${exename}.wasm" ]; then
-  WASM_HOST_EXECUTABLE="wasmtime run -S http"
+  WASM_HOST_EXECUTABLE="wasmtime run -S http --dir=."
   WASM_BINARY_TO_EXECUTE="${dirname}/${exename}.wasm"
 fi