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filter_values_test.ts
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filter_values_test.ts
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// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
import { assertEquals } from "@std/assert";
import { filterValues } from "./filter_values.ts";
function filterValuesTest<T>(
input: [Record<string, T>, (value: T) => boolean],
expected: Record<string, T>,
message?: string,
) {
const actual = filterValues(...input);
assertEquals(actual, expected, message);
}
Deno.test({
name: "filterValues() handles no mutation",
fn() {
const object = { a: 5, b: true };
filterValues(object, (it) => it !== 5);
assertEquals(object, { a: 5, b: true });
},
});
Deno.test({
name: "filterValues() handles empty input",
fn() {
filterValuesTest(
[{}, () => true],
{},
);
},
});
Deno.test({
name: "filterValues() handles identity",
fn() {
filterValuesTest(
[
{
foo: true,
bar: "lorem",
1: -5,
},
() => true,
],
{
foo: true,
bar: "lorem",
1: -5,
},
);
},
});
Deno.test({
name: "filterValues() handles filters",
fn() {
filterValuesTest(
[
{
"a5e4": { job: "Testing", error: true },
"112d": { job: "Building", error: false },
"0a1e": { job: "Approval", error: true },
},
(it) => it.error,
],
{
"a5e4": { job: "Testing", error: true },
"0a1e": { job: "Approval", error: true },
},
);
filterValuesTest(
[
{
"todo": ["1023", "1024"],
"dev": ["1010, 1040", "1001"],
"done": ["1000"],
},
(it) => it.length > 1,
],
{
"todo": ["1023", "1024"],
"dev": ["1010, 1040", "1001"],
},
);
},
});