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test("basic functionality", () => {
expect(RegExp().toString()).toBe("/(?:)/");
expect(RegExp(undefined).toString()).toBe("/(?:)/");
expect(RegExp("foo").toString()).toBe("/foo/");
expect(RegExp("foo", undefined).toString()).toBe("/foo/");
expect(RegExp("foo", "g").toString()).toBe("/foo/g");
expect(RegExp(undefined, "g").toString()).toBe("/(?:)/g");
});
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