20 lines
497 B
JavaScript
20 lines
497 B
JavaScript
expect(null ?? undefined).toBeUndefined(undefined);
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expect(undefined ?? null).toBeNull();
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expect(false ?? true).toBe(false);
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expect(0 ?? 1).toBe(0);
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expect("" ?? "foo").toBe("");
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var obj = { exists: true };
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expect(obj.exists ?? false).toBe(true);
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expect(obj.doesNotExist ?? "foo").toBe("foo");
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var counter = 0;
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function sideEffect() { return counter++; }
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expect(sideEffect() ?? -1).toBe(0);
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var counter2 = 0;
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var obj2 = {
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get foo() { return counter2++; }
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};
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expect(obj2.foo ?? -1).toBe(0);
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