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approx_equal.test.js
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approx_equal.test.js
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/* eslint no-shadow: 0 */
const test = require("tap").test;
const ss = require("../");
const EPS = ss.epsilon;
const HALF_EPS = ss.epsilon / 2;
const TWO_EPS = ss.epsilon * 2;
test("approximate strict equality", function (t) {
t.test("handles equal values", function (t) {
t.ok(ss.approxEqual(14.5, 14.5));
t.end();
});
t.test("handles values separated by less than epsilon", function (t) {
t.ok(ss.approxEqual(1, 1 + HALF_EPS));
t.end();
});
t.test("handles values separated by more than epsilon", function (t) {
t.ok(!ss.approxEqual(1, 1 + TWO_EPS));
t.end();
});
t.test(
"handles values separated by relatively less than epsilon",
function (t) {
t.ok(ss.approxEqual(100, 100 + 99 * ss.epsilon));
t.end();
}
);
t.test(
"handles values separated by relatively more than epsilon",
function (t) {
t.ok(!ss.approxEqual(100, 100 + 101 * ss.epsilon));
t.end();
}
);
t.test("handles negative values", function (t) {
t.ok(ss.approxEqual(-10, -10));
t.ok(ss.approxEqual(-10 - EPS, -10));
t.ok(!ss.approxEqual(-10 - 11 * EPS, -10));
t.ok(!ss.approxEqual(-10, 10));
t.end();
});
t.test("handles larger tolerances", function (t) {
t.ok(!ss.approxEqual(1, 2));
t.ok(ss.approxEqual(1, 2, 1.5));
t.end();
});
t.test("handles values near zero", function (t) {
t.ok(!ss.approxEqual(1, 0));
t.ok(!ss.approxEqual(0, 1));
t.end();
});
t.end();
});