squiggle/packages/squiggle-lang/__tests__/TS/TestHelpers.ts

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import {
run,
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// Distribution,
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squiggleExpression,
errorValueToString,
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// errorValue,
// result,
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} from "../../src/js/index";
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export function testRun(x: string): squiggleExpression {
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let squiggleResult = run(x, {}, { sampleCount: 1000, xyPointLength: 100 });
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// return squiggleResult.value
if (squiggleResult.tag === "Ok") {
return squiggleResult.value;
} else {
throw new Error(
`Expected squiggle expression to evaluate but got error: ${errorValueToString(
squiggleResult.value
)}`
);
}
}
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export function failDefault() {
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expect("be reached").toBe("codepath should never");
}
/**
* This appears also in `TestHelpers.res`. According to https://www.math.net/percent-error, it computes
* absolute error when numerical stability concerns make me not want to compute relative error.
* */
export function expectErrorToBeBounded(
received: number,
expected: number,
epsilon: number,
digits: number
) {
let distance = Math.abs(received - expected);
let expectedAbs = Math.abs(expected);
let normalizingDenom = Math.max(expectedAbs, 1);
let error = distance / normalizingDenom;
expect(Math.round(10 ** digits * error) / 10 ** digits).toBeLessThanOrEqual(
epsilon
);
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}