LibJS: Add Boolean constructor object

Author: https://github.com/jack-karamanian
Commit: edae926cb0
Pull-request: https://github.com/SerenityOS/serenity/pull/1682
Reviewed-by: https://github.com/bgianfo

Libraries/LibJS/Tests/Boolean.js

@@ -0,0 +1,35 @@
+try {
+  assert(Boolean.length === 1);
+  assert(typeof new Boolean() === "object");
+  assert(new Boolean().valueOf() === false);
+
+  var foo = new Boolean(true);
+  var bar = new Boolean(true);
+
+  assert(foo !== bar);
+  assert(foo.valueOf() === bar.valueOf());
+
+  assert(new Boolean(true).toString() === "true");
+  assert(new Boolean(false).toString() === "false");
+
+  assert(typeof Boolean() === "boolean");
+  assert(typeof Boolean(true) === "boolean");
+
+  assert(Boolean() === false);
+  assert(Boolean(false) === false);
+  assert(Boolean(null) === false);
+  assert(Boolean(undefined) === false);
+  assert(Boolean(NaN) === false);
+  assert(Boolean("") === false);
+  assert(Boolean(0.0) === false);
+  assert(Boolean(-0.0) === false);
+  assert(Boolean(true) === true);
+  assert(Boolean("0") === true);
+  assert(Boolean({}) === true);
+  assert(Boolean([]) === true);
+  assert(Boolean(1)) === true;
+
+  console.log("PASS");
+} catch (err) {
+  console.log("FAIL: " + err);
+}

Libraries/LibJS/Tests/Boolean.prototype.js

@@ -0,0 +1,8 @@
+try {
+  assert(typeof Boolean.prototype === "object");
+  assert(Boolean.prototype.valueOf() === false);
+
+  console.log("PASS");
+} catch (err) {
+  console.log("FAIL: " + err);
+}

Libraries/LibJS/Tests/Boolean.prototype.toString.js

@@ -0,0 +1,23 @@
+try {
+  var foo = true;
+  assert(foo.toString() === "true");
+  assert(true.toString() === "true");
+
+  assert(Boolean.prototype.toString.call(true) === "true");
+  assert(Boolean.prototype.toString.call(false) === "false");
+
+  let error = null;
+  try {
+    Boolean.prototype.toString.call("foo");
+  } catch (err) {
+    error = err;
+  }
+
+  assert(error instanceof Error);
+  assert(error.name === "TypeError");
+  assert(error.message === "Not a Boolean");
+
+  console.log("PASS");
+} catch (err) {
+  console.log("FAIL: " + err);
+}

Libraries/LibJS/Tests/Boolean.prototype.valueOf.js

@@ -0,0 +1,23 @@
+try {
+  var foo = true;
+  assert(foo.valueOf() === true);
+  assert(true.valueOf() === true);
+
+  assert(Boolean.prototype.valueOf.call(true) === true);
+  assert(Boolean.prototype.valueOf.call(false) === false);
+
+  let error = null;
+  try {
+    Boolean.prototype.valueOf.call("foo");
+  } catch (err) {
+    error = err;
+  }
+
+  assert(error instanceof Error);
+  assert(error.name === "TypeError");
+  assert(error.message === "Not a Boolean");
+
+  console.log("PASS");
+} catch (err) {
+  console.log("FAIL: " + err);
+}