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import { TokenBucket } from "./TokenBucket.js";
import { wait } from "./clock.js";
const TIMING_EPSILON = 10;
describe("TokenBucket", () => {
    describe("capacity 10, 1 per 100ms", () => {
        it("is initialized empty", () => {
            const bucket = new TokenBucket({ bucketSize: 10, tokensPerInterval: 1, interval: 100 });
            expect(bucket.bucketSize).toEqual(10);
            expect(bucket.tokensPerInterval).toEqual(1);
            expect(bucket.content).toEqual(0);
        });
        it("removing 10 tokens takes 1 second", async () => {
            const start = +new Date();
            const bucket = new TokenBucket({ bucketSize: 10, tokensPerInterval: 1, interval: 100 });
            const remainingTokens = await bucket.removeTokens(10);
            const duration = +new Date() - start;
            const diff = Math.abs(1000 - duration);
            expect(diff < TIMING_EPSILON);
            expect(remainingTokens).toEqual(0);
            expect(bucket.content).toEqual(0);
        });
        it("removing another 10 tokens takes 1 second", async () => {
            const bucket = new TokenBucket({ bucketSize: 10, tokensPerInterval: 1, interval: 100 });
            await bucket.removeTokens(10);
            const start = +new Date();
            const remainingTokens = await bucket.removeTokens(10);
            const duration = +new Date() - start;
            const diff = Math.abs(1000 - duration);
            expect(diff < TIMING_EPSILON);
            expect(remainingTokens).toEqual(0);
            expect(bucket.content).toEqual(0);
        });
        it("waiting 2 seconds gives us only 10 tokens", async () => {
            const bucket = new TokenBucket({ bucketSize: 10, tokensPerInterval: 1, interval: 100 });
            await wait(2000);
            const start = +new Date();
            const remainingTokens = await bucket.removeTokens(10);
            const duration = +new Date() - start;
            expect(duration < TIMING_EPSILON);
            expect(remainingTokens).toEqual(0);
        });
        it("removing 1 token takes 100ms", async () => {
            const bucket = new TokenBucket({ bucketSize: 10, tokensPerInterval: 1, interval: 100 });
            const start = +new Date();
            const remainingTokens = await bucket.removeTokens(1);
            const duration = +new Date() - start;
            const diff = Math.abs(100 - duration);
            expect(diff < TIMING_EPSILON);
            expect(remainingTokens).toBeLessThan(1);
        });
    });
});
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