Add a few CLI tests for WASI. (#1281)

While here, move rs2wasm-add-func.wat into the same directory as the
other .wat tests to keep things tidy.

tests/cli_tests.rs

@@ -103,6 +103,23 @@ fn run_wasmtime_unreachable_wat() -> Result<()> {
     assert_eq!(code, 128 + libc::SIGABRT);
     #[cfg(windows)]
     assert_eq!(code, 3);
-
+    Ok(())
+}
+
+// Run a simple WASI hello world, snapshot0 edition.
+#[test]
+fn hello_wasi_snapshot0() -> Result<()> {
+    let wasm = build_wasm("tests/wasm/hello_wasi_snapshot0.wat")?;
+    let stdout = run_wasmtime(&[wasm.path().to_str().unwrap(), "--disable-cache"])?;
+    assert_eq!(stdout, "Hello, world!\n");
+    Ok(())
+}
+
+// Run a simple WASI hello world, snapshot1 edition.
+#[test]
+fn hello_wasi_snapshot1() -> Result<()> {
+    let wasm = build_wasm("tests/wasm/hello_wasi_snapshot1.wat")?;
+    let stdout = run_wasmtime(&[wasm.path().to_str().unwrap(), "--disable-cache"])?;
+    assert_eq!(stdout, "Hello, world!\n");
     Ok(())
 }

tests/instantiate.rs

@@ -5,7 +5,7 @@ use wasmtime_environ::settings::Configurable;
 use wasmtime_environ::CacheConfig;
 use wasmtime_jit::{instantiate, native, CompilationStrategy, Compiler, NullResolver};
 
-const PATH_MODULE_RS2WASM_ADD_FUNC: &str = r"tests/wat/rs2wasm-add-func.wat";
+const PATH_MODULE_RS2WASM_ADD_FUNC: &str = r"tests/wasm/rs2wasm-add-func.wat";
 
 /// Simple test reading a wasm-file and translating to binary representation.
 #[test]

tests/wasm/hello_wasi_snapshot0.wat

@@ -0,0 +1,25 @@
+(module
+  (import "wasi_unstable" "proc_exit"
+    (func $__wasi_proc_exit (param i32)))
+  (import "wasi_unstable" "fd_write"
+    (func $__wasi_fd_write (param i32 i32 i32 i32) (result i32)))
+  (func $_start
+    (i32.store (i32.const 24) (i32.const 14))
+    (i32.store (i32.const 20) (i32.const 0))
+    (block
+      (br_if 0
+        (call $__wasi_fd_write
+          (i32.const 1)
+          (i32.const 20)
+          (i32.const 1)
+          (i32.const 16)))
+      (br_if 0 (i32.ne (i32.load (i32.const 16)) (i32.const 14)))
+      (br 1)
+    )
+    (call $__wasi_proc_exit (i32.const 1))
+  )
+  (memory 1)
+  (export "memory" (memory 0))
+  (export "_start" (func $_start))
+  (data (i32.const 0) "Hello, world!\0a")
+)

tests/wasm/hello_wasi_snapshot1.wat

@@ -0,0 +1,25 @@
+(module
+  (import "wasi_snapshot_preview1" "proc_exit"
+    (func $__wasi_proc_exit (param i32)))
+  (import "wasi_snapshot_preview1" "fd_write"
+    (func $__wasi_fd_write (param i32 i32 i32 i32) (result i32)))
+  (func $_start
+    (i32.store (i32.const 24) (i32.const 14))
+    (i32.store (i32.const 20) (i32.const 0))
+    (block
+      (br_if 0
+        (call $__wasi_fd_write
+          (i32.const 1)
+          (i32.const 20)
+          (i32.const 1)
+          (i32.const 16)))
+      (br_if 0 (i32.ne (i32.load (i32.const 16)) (i32.const 14)))
+      (br 1)
+    )
+    (call $__wasi_proc_exit (i32.const 1))
+  )
+  (memory 1)
+  (export "memory" (memory 0))
+  (export "_start" (func $_start))
+  (data (i32.const 0) "Hello, world!\0a")
+)