Migrate the import_class to wasm

tests/wasm/import_class.js

@@ -0,0 +1,125 @@
+const assert = require('assert');
+const wasm = require('wasm-bindgen-test');
+
+exports.math_log = Math.log;
+
+exports.StaticFunction = class {
+  static bar() { return 2; }
+};
+
+class Construct {
+  static create() {
+    const ret = new Construct();
+    ret.internal_string = 'this';
+    return ret;
+  }
+
+  get_internal_string() {
+    return this.internal_string;
+  }
+
+  append_to_internal_string(s) {
+    this.internal_string += s;
+  }
+
+  assert_internal_string(s) {
+    assert.strictEqual(this.internal_string, s);
+  }
+}
+
+Construct.internal_string = '';
+exports.Construct = Construct;
+
+exports.NewConstructors = class {
+  constructor(field) {
+    this.field = field;
+  }
+
+  get() {
+    return this.field + 1;
+  }
+};
+
+let switch_called = false;
+class SwitchMethods {
+  constructor() {
+  }
+
+  static a() {
+    switch_called = true;
+  }
+
+  b() {
+    switch_called = true;
+  }
+}
+exports.SwitchMethods = SwitchMethods;
+exports.switch_methods_called = function() {
+  const tmp = switch_called;
+  switch_called = false;
+  return tmp;
+};
+exports.switch_methods_a = function() { SwitchMethods.a = function() {}; };
+exports.switch_methods_b = function() { SwitchMethods.prototype.b = function() {}; };
+
+exports.Properties = class {
+  constructor() {
+    this.num = 1;
+  }
+
+  get a() {
+    return this.num;
+  }
+
+  set a(val) {
+    this.num = val;
+  }
+};
+
+exports.RenameProperties = class {
+  constructor() {
+    this.num = 1;
+  }
+
+  get a() {
+    return this.num;
+  }
+
+  set a(val) {
+    this.num = val;
+  }
+};
+
+class Options {
+}
+exports.Options = Options;
+
+exports.take_none = function(val) {
+  assert.strictEqual(val, undefined);
+};
+
+exports.take_some = function(val) {
+  assert.strictEqual(val === undefined, false);
+};
+
+exports.return_null = function() {
+  return null;
+};
+
+exports.return_undefined = function() {
+  return undefined;
+};
+
+exports.return_some = function() {
+  return new Options();
+};
+
+exports.run_rust_option_tests = function() {
+  wasm.rust_take_none();
+  wasm.rust_take_none(null)
+  wasm.rust_take_none(undefined);
+  wasm.rust_take_some(new Options());
+  assert.strictEqual(wasm.rust_return_none(), undefined);
+  assert.strictEqual(wasm.rust_return_none(), undefined);
+  assert.strictEqual(wasm.rust_return_some() === undefined, false);
+};