Add tests for variable declarations

test/mjsunit/harmony/typesystem/variable-declarations.js

+// Copyright 2016 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --harmony-types
+
+
+load("test/mjsunit/harmony/typesystem/typegen.js");
+debug = true;
+
+
+// In all the following functions, the size parameter (positive integer)
+// denotes how many test cases will be tried.  The variable test_size
+// controls execution time of this test.  It should not be too high.
+let test_size = 1000;
+
+
+function ValidVariableDeclarations(size, keyword="var") {
+  return Generate(size, [
+    new TestGen(1, ValidTypes, [
+      keyword != "const" && (t => keyword + " x : " + t + ";"),
+      t => keyword + " x : " + t + " = undefined;"
+    ]),
+    new TestGen(1, ValidTypes, [
+      t => keyword + " [x, y, ...rest] : (" + t + ")[] = [];"
+    ]),
+    new TestGen(1, ValidTupleTypes, [
+      t => keyword + " [x,, z] : " + t + " = [undefined,, undefined];"
+    ]),
+    new TestGen(1, ValidObjectTypes, [
+      t => keyword + " {a: x, b: y} : " + t + " = {a: 17, b: 42};"
+    ])
+  ]);
+}
+
+function InvalidVariableDeclarations(size, keyword="var") {
+  return Generate(size, [
+    new TestGen(1, InvalidTypes, [
+      keyword != "const" && (t => keyword + " x : " + t + ";"),
+      t => keyword + " x : " + t + " = undefined;"
+    ]),
+    new TestGen(1, InvalidTypes, [
+      keyword != "const" && (t => keyword + " [x, y, ...rest] : (" + t + ")[];"),
+      t => keyword + " [x, y, ...rest] : (" + t + ")[] = [];"
+    ]),
+    new TestGen(1, InvalidTupleTypes, [
+      keyword != "const" && (t => keyword + " [x,, z] : " + t + ";"),
+      t => keyword + " [x,, z] : " + t + " = [undefined,, undefined];"
+    ]),
+    new TestGen(1, InvalidObjectTypes, [
+      keyword != "const" && (t => keyword + " {a: x, b: y} : " + t + ";"),
+      t => keyword + " {a: x, b: y} : " + t + " = {a: 17, b: 42};"
+    ]),
+    "var [x, y]: number[];",
+    "var {a: x, b: y}: {a: number, b: string};",
+    "let [x, y]: number[];",
+    "let {a: x, b: y}: {a: number, b: string};",
+    "const x: number;",
+    "const [x, y]: [number, string];",
+    "const {a: x, b: y}: {a: number, b: string};"
+  ]);
+}
+
+(function TestVariableDeclarations(size) {
+  Test(size, [
+    new TestGen(1, ValidVariableDeclarations, [CheckValid], "var"),
+    new TestGen(1, ValidVariableDeclarations, [CheckValid], "let"),
+    new TestGen(1, ValidVariableDeclarations, [CheckValid], "const"),
+    new TestGen(1, InvalidVariableDeclarations, [CheckInvalid], "var"),
+    new TestGen(1, InvalidVariableDeclarations, [CheckInvalid], "let"),
+    new TestGen(1, InvalidVariableDeclarations, [CheckInvalid], "const")
+  ]);
+})(test_size);