mozilla-central/devtools/client/debugger/test/mochitest/browser_dbg-javascript-tracer-function-returns.js (file symbol)

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Test Info: Warnings

/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at <http://mozilla.org/MPL/2.0/>. */
// Tests tracing all function returns
"use strict";
add_task(async function testTracingFunctionReturn() {
await pushPref("devtools.debugger.features.javascript-tracing", true);
const jsCode = `async function foo() { nullReturn(); falseReturn(); await new Promise(r => setTimeout(r, 0)); return bar(); }; function nullReturn() { return null; } function falseReturn() { return false; } function bar() { return 42; }; function throwingFunction() { throw new Error("the exception") }`;
const dbg = await initDebuggerWithAbsoluteURL(
"data:text/html," +
encodeURIComponent(`<script>${jsCode}</script><body></body>`)
);
// This test covers the Web Console, whereas it is no longer the default output
await toggleJsTracerMenuItem(dbg, "#jstracer-menu-item-console");
await toggleJsTracerMenuItem(dbg, "#jstracer-menu-item-function-return");
info("Enable tracing with function returns, but without values");
await toggleJsTracer(dbg.toolbox);
invokeInTab("foo");
await hasConsoleMessage(dbg, "⟶ interpreter λ foo");
await hasConsoleMessage(dbg, "⟶ interpreter λ bar");
await hasConsoleMessage(dbg, "⟵ λ bar");
await hasConsoleMessage(dbg, "⟵ λ foo");
await toggleJsTracer(dbg.toolbox);
await toggleJsTracerMenuItem(dbg, "#jstracer-menu-item-log-values");
info("Re-enable with returned values");
await toggleJsTracer(dbg.toolbox);
invokeInTab("foo");
await hasConsoleMessage(dbg, "⟶ interpreter λ foo");
await hasConsoleMessage(dbg, "⟶ interpreter λ bar");
await hasConsoleMessage(dbg, "⟵ λ bar return 42");
await hasConsoleMessage(dbg, "⟶ interpreter λ nullReturn");
await hasConsoleMessage(dbg, "⟵ λ nullReturn return null");
await hasConsoleMessage(dbg, "⟶ interpreter λ falseReturn");
await hasConsoleMessage(dbg, "⟵ λ falseReturn return false");
await hasConsoleMessage(
dbg,
`⟵ λ foo return \nPromise { <state>: "fulfilled", <value>: 42 }`
);
invokeInTab("throwingFunction").catch(() => {});
await hasConsoleMessage(
dbg,
`⟵ λ throwingFunction throw \nError: the exception`
);
info("Stop tracing");
await toggleJsTracer(dbg.toolbox);
info("Toggle the two settings to the default value");
await toggleJsTracerMenuItem(dbg, "#jstracer-menu-item-log-values");
await toggleJsTracerMenuItem(dbg, "#jstracer-menu-item-function-return");
// Reset the trace on next interaction setting
Services.prefs.clearUserPref(
"devtools.debugger.javascript-tracing-on-next-interaction"
);
});