Fix wasm-pack test, disable test_forward/systex.

(cherry picked from commit 155b3cee4c499187c5a49551e1d50f59cb6e12fe)

Cargo.toml

@@ -55,3 +55,6 @@ web-sys = { version = "0.3", features = [
     "MidiPort",
     "MidiPortType"
 ]}
+
+[target.'cfg(target_arch = "wasm32")'.dev-dependencies]
+wasm-bindgen-test = "0.2"

examples/test_forward.rs

@@ -12,6 +12,7 @@ fn main() {
     }
 }
 
+#[cfg(not(target_arch = "wasm32"))] // conn_out is not `Send` in Web MIDI, which means it cannot be passed to connect
 fn run() -> Result<(), Box<Error>> {
     let mut input = String::new();
     
@@ -61,4 +62,10 @@ fn run() -> Result<(), Box<Error>> {
 
     println!("Closing connections");
     Ok(())
-}
+}
+
+#[cfg(target_arch = "wasm32")]
+fn run() -> Result<(), Box<Error>> {
+    println!("test_forward cannot run on Web MIDI");
+    Ok(())
+}

examples/test_sysex.rs

@@ -7,7 +7,7 @@ fn main() {
     }
 }
 
-#[cfg(not(windows))] // virtual ports are not supported on Windows
+#[cfg(not(any(windows, target_arch = "wasm32")))] // virtual ports are not supported on Windows nor on Web MIDI
 mod example {
 
 use std::thread::sleep;
@@ -73,7 +73,7 @@ pub fn run() -> Result<(), Box<Error>> {
 }
 
  // needed to compile successfully
-#[cfg(windows)] mod example {
+#[cfg(any(windows, target_arch = "wasm32"))] mod example {
     use std::error::Error;
     pub fn run() -> Result<(), Box<Error>> { Ok(()) }
 }

src/common.rs

@@ -238,11 +238,13 @@ mod tests {
     fn test_trait_impls() {
         // make sure that all the structs implement `Send`
         fn is_send<T: Send>() {}
-        is_send::<MidiInputPort>();
         is_send::<MidiInput>();
-        is_send::<MidiInputConnection<()>>();
-        is_send::<MidiOutputPort>();
         is_send::<MidiOutput>();
-        is_send::<MidiOutputConnection>();
+        #[cfg(not(target_arch = "wasm32"))] {
+            is_send::<MidiInputPort>();
+            is_send::<MidiInputConnection<()>>();
+            is_send::<MidiOutputPort>();
+            is_send::<MidiOutputConnection>();
+        }
     }
 }

tests/virtual.rs

@@ -1,5 +1,5 @@
-//! This file contains automated tests, but they require virtual ports and therefore can't work on Windows ...
-#![cfg(not(windows))]
+//! This file contains automated tests, but they require virtual ports and therefore can't work on Windows or Web MIDI ...
+#![cfg(not(any(windows, target_arch = "wasm32")))]
 extern crate midir;
 
 use std::thread::sleep;