error-report.js - mozsearch

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    // Plain-old Error object

    let error = new Error("foobar");

    let report = createErrorReport(error);

    assertEq(report.toStringResult, "Error: foobar");

    assertEq(report.name, "Error");

    assertEq(report.message, "foobar");

    // Error object with overwritten properties

    let error = new Error("foobar");

    error.name = "MyError";

    error.message = "here";

    let report = createErrorReport(error);

    assertEq(report.toStringResult, "MyError: here");

    assertEq(report.name, "Error");

    assertEq(report.message, "here");

    // Plain object, which doesn't quack (enough) like an Error

    let obj = {name: "foo", message: "bar"};

    let report = createErrorReport(obj);

    assertEq(report.toStringResult, "uncaught exception: [object Object]");

    assertEq(report.name, "");

    assertEq(report.message, "uncaught exception: [object Object]");

    // Duck-typed error object

    let obj = {name: "foo", message: "bar", fileName: "test", lineNumber: 0};

    let report = createErrorReport(obj);

    assertEq(report.toStringResult, "foo: bar");

    assertEq(report.name, "");

    assertEq(report.message, "foo: bar");

    // toString failure

    let obj = {toString() { throw "haha"; }};

    let report = createErrorReport(obj);

    assertEq(report.toStringResult, "uncaught exception: unknown (can't convert to string)");

    assertEq(report.name, "");

    assertEq(report.message, "uncaught exception: unknown (can't convert to string)");