isError.js - mozsearch

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// |reftest| shell-option(--enable-error-iserror) skip-if(!Error.isError)

// Test non-object input should return false

assertEq(Error.isError(null), false);

assertEq(Error.isError(undefined), false);

assertEq(Error.isError(123), false);

assertEq(Error.isError("string"), false);

// Test plain objects should return false

assertEq(Error.isError({}), false);

assertEq(Error.isError(new Object()), false);

// Test various error objects should return true

assertEq(Error.isError(new Error()), true);

assertEq(Error.isError(new TypeError()), true);

assertEq(Error.isError(new RangeError()), true);

if (typeof reportCompare === 'function')

    reportCompare(0, 0);