move selftests to subdirectory and run more selftests

tests/wasm-workspace/crates/two/Cargo.toml

@@ -0,0 +1,9 @@
+[package]
+name = "wasm-two"
+version = "0.1.0"
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+clap = "3"

tests/wasm-workspace/crates/two/src/main.rs

@@ -0,0 +1,3 @@
+fn main() {
+    println!("Hello, world!");
+}