[OBSOLETE] De-flake the websocket/close.html layout test

LayoutTests/http/tests/websocket/resources/close-common.js

+// Variables used in js-test.js assertions.
+var exceptionName;
+var exceptionMessage;
+var exceptionProto;
+var closeEvent;
+
+// Constants.
+const invalidAccessErr = "InvalidAccessError";
+const syntaxErr = "SyntaxError";
+const normalClosure = 1000;
+const abnormalClosure = 1006;
+const url = "ws://127.0.0.1:8880/close";
+const ws_handlers = ["onopen", "onerror", "onclose", "onmessage"];
+
+// An explicit timeout is used so that we can capture the test output.
+var timeout;
+
+const badCodesTestCodes = [
+    999, 1001, 2999, 5000, 65536 + 1000, 0x100000000 + 1000, 2999.9, NaN, "0", "100", 1/0, -1/0, 0/0,
+];
+
+const badReasonTestReasons = [
+    "1234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234", // 124 Byte
+    "12345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012\u00a9", // length is 123, but 124 Byte in UTF-8
+];
+
+function createFailHandler(name, ws, reject)
+{
+    return function() {
+        removeAllHandlers(ws);
+        reject(name + " was called.");
+    };
+}
+
+function setDefaultHandlers(ws, reject)
+{
+    ws_handlers.forEach(function(handler) {
+        ws[handler] = createFailHandler(handler, ws, reject);
+    });
+}
+
+// Ensure that the WebSocket can be garbage collected.
+function removeAllHandlers(ws)
+{
+    ws_handlers.forEach(function(handler) {
+        ws[handler] = undefined;
+    });
+}
+
+// Verify that close() throws an exception when an invalid close code is passed.
+function badCodesTest()
+{
+    return new Promise(function(resolve, reject) {
+        debug("badCodesTest: started");
+        var ws = new WebSocket(url);
+        setDefaultHandlers(ws, reject);
+        for (var test_code of badCodesTestCodes) {
+            debug("badCodesTest: " + test_code);
+            try {
+                ws.close(test_code);
+                reject("Exception not thrown for code " + test_code);
+                return;
+            } catch (e) {
+                exceptionName = e.name;
+                exceptionMessage = e.message;
+                exceptionProto = Object.getPrototypeOf(e);
+                shouldBeTrue("exceptionProto === DOMException.prototype");
+                shouldBeEqualToString("exceptionName", invalidAccessErr);
+                var expectedCode = test_code;
+                if (!expectedCode)
+                    expectedCode = 0;
+                else if (expectedCode > 65535)
+                    expectedCode = 65535;
+                else if (expectedCode < 0)
+                    expectedCode = 0;
+                expectedCode = Math.floor(expectedCode);
+                shouldBeEqualToString("exceptionMessage", "Failed to execute 'close' on 'WebSocket': The code must be either 1000, or between 3000 and 4999. " + expectedCode + " is neither.");
+            }
+        }
+        removeAllHandlers(ws);
+        resolve();
+    });
+}
+
+// Verify that passing a valid code does not throw an exception.
+function goodCodeTest()
+{
+    return new Promise(function(resolve, reject) {
+        debug("goodCodeTest: started");
+        var ws = new WebSocket(url);
+        setDefaultHandlers(ws, reject);
+        ws.onclose = function(e) {
+            closeEvent = e;
+            shouldBeEqualToNumber("closeEvent.code", abnormalClosure);
+            resolve();
+        };
+        ws.onerror = function() {
+            testPassed("onerror was called.");
+        };
+        ws.close(1000.0);
+    });
+}
+
+// Verify that unpaired surrogates in the reason string are converted to U+FFFD
+// before sending to the remote server.
+function invalidUnicodeReasonTest()
+{
+    return new Promise(function(resolve, reject) {
+        debug("invalidUnicodeReasonTest: started");
+        var ws = new WebSocket(url);
+        setDefaultHandlers(ws, reject);
+        ws.onopen = function() {
+            // 0xD834 is an unpaired surrogate.
+            var invalidString = String.fromCharCode(0xD834);
+            ws.close(1000, invalidString);
+        };
+        ws.onclose = function(e) {
+            closeEvent = e;
+            shouldBeTrue("closeEvent.wasClean");
+            shouldBeEqualToString("closeEvent.reason", "\uFFFD");
+            resolve();
+        };
+    });
+}
+
+// Verify that invalid reason strings passed to close() result in an exception
+// being thrown.
+function badReasonTest()
+{
+    return new Promise(function(resolve, reject) {
+        debug("badReasonTest: started");
+        var ws = new WebSocket(url);
+        setDefaultHandlers(ws, reject);
+        for (var test_reason of badReasonTestReasons) {
+            debug("badReasonTest: " + test_reason);
+            try {
+                ws.close(normalClosure, test_reason);
+                reject("Exception not thrown for bad reason " + test_reason);
+                return;
+            } catch (e) {
+                exceptionName = e.name;
+                exceptionProto = Object.getPrototypeOf(e);
+                shouldBeTrue("exceptionProto === DOMException.prototype");
+                shouldBeEqualToString("exceptionName", syntaxErr);
+            }
+        }
+        removeAllHandlers(ws);
+        resolve();
+    });
+}
+
+// Verify that a valid reason code passed to close() does not result in an
+// exception.
+function goodReasonTest()
+{
+    return new Promise(function(resolve, reject) {
+        debug("goodReasonTest: started");
+        var ws = new WebSocket(url);
+        setDefaultHandlers(ws, reject);
+        ws.onclose = function(e) {
+            closeEvent = e;
+            shouldBeEqualToNumber("closeEvent.code", abnormalClosure);
+            resolve();
+        };
+        ws.onerror = function() {
+            testPassed("onerror was called.");
+        };
+        // 123 byte reason should not throw.
+        ws.close(normalClosure, "123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123");
+    });
+}
+
+// Verify that valid close codes and reasons are correctly send to the
+// WebSocket server.
+function codeAndReasonTest()
+{
+    const codes = [
+        1000,
+        3000,
+        4000,
+        4999
+    ];
+    const reasons = [
+        "OK, Bye!",
+        "3000",
+        "code is 4000",
+        "\u00a9 Google"
+    ];
+    return new Promise(function(resolve, reject) {
+        debug("codeAndReasonTest: started");
+        // Tests are run in series to produce deterministic output.
+        var promise = Promise.resolve();
+        for (var id = 0; id < codes.length; ++id) {
+            promise = promise.then(codeAndReasonSingleCase(codes[id], reasons[id]));
+        }
+        promise.then(resolve);
+    });
+}
+
+// (Return a function which returns a Promise to) handle a single code/reason
+// pair for the codeAndReasonTest.
+function codeAndReasonSingleCase(test_code, test_reason)
+{
+    return function() {
+        return new Promise(function(resolve, reject) {
+            debug("codeAndReasonTest: " + test_code + ", '" + test_reason + "'");
+            var ws = new WebSocket(url);
+            setDefaultHandlers(ws, reject);
+            ws.onopen = function() {
+                ws.close(test_code, test_reason);
+            };
+            ws.onclose = function(e) {
+                closeEvent = e;
+                shouldBeTrue("closeEvent.wasClean");
+                shouldBeEqualToNumber("closeEvent.code", test_code);
+                shouldBeEqualToString("closeEvent.reason", test_reason);
+                resolve();
+            };
+        });
+    };
+}
+
+function cleanup()
+{
+    clearTimeout(timeout);
+    finishJSTest();
+}
+
+function onTimeout()
+{
+    handleRejection("Timeout");
+}
+
+function handleRejection(reason)
+{
+    if (reason instanceof Error) {
+        // Get a stack trace if an exception fired.
+        testFailed(reason.stack);
+    } else {
+        testFailed(reason);
+    }
+    cleanup();
+}
+
+function testClose()
+{
+    // Set an explicit timeout in order to keep text output on failure.
+    timeout = setTimeout(onTimeout, 5000);
+    // Tests are run in series to produce deterministic output.
+    badCodesTest()
+        .then(goodCodeTest)
+        .then(invalidUnicodeReasonTest)
+        .then(badReasonTest)
+        .then(goodReasonTest)
+        .then(codeAndReasonTest)
+        .then(cleanup)
+        .catch(handleRejection);
+}