Add test for custom values in enums

tests/enums.rs

@@ -42,3 +42,46 @@ fn c_style_enum() {
         "#)
         .test();
 }
+
+#[test]
+fn c_style_enum_with_custom_values() {
+    test_support::project()
+        .file("src/lib.rs", r#"
+            #![feature(proc_macro)]
+
+            extern crate wasm_bindgen;
+
+            use wasm_bindgen::prelude::*;
+
+            #[wasm_bindgen]
+            pub enum Color {
+                Green = 21,
+                Yellow = 34,
+                Red,
+            }
+
+            #[no_mangle]
+            #[wasm_bindgen]
+            pub extern fn cycle(color: Color) -> Color {
+                match color {
+                    Color::Green => Color::Yellow,
+                    Color::Yellow => Color::Red,
+                    Color::Red => Color::Green,
+                }
+            }
+        "#)
+        .file("test.ts", r#"
+            import * as assert from "assert";
+            import * as wasm from "./out";
+
+            export function test() {
+                assert.strictEqual(wasm.Color.Green, 21);
+                assert.strictEqual(wasm.Color.Yellow, 34);
+                assert.strictEqual(wasm.Color.Red, 2);
+                assert.strictEqual(Object.keys(wasm.Color).length, 3);
+
+                assert.strictEqual(wasm.cycle(wasm.Color.Green), wasm.Color.Yellow);
+            }
+        "#)
+        .test();
+}