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std/testing/diff_test.ts

Deno standard library
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import diff from "./diff.ts";import { assertEquals } from "../testing/asserts.ts";const { test } = Deno;
test({ name: "empty", fn(): void { assertEquals(diff([], []), []); },});
test({ name: '"a" vs "b"', fn(): void { assertEquals(diff(["a"], ["b"]), [ { type: "removed", value: "a" }, { type: "added", value: "b" }, ]); },});
test({ name: '"a" vs "a"', fn(): void { assertEquals(diff(["a"], ["a"]), [{ type: "common", value: "a" }]); },});
test({ name: '"a" vs ""', fn(): void { assertEquals(diff(["a"], []), [{ type: "removed", value: "a" }]); },});
test({ name: '"" vs "a"', fn(): void { assertEquals(diff([], ["a"]), [{ type: "added", value: "a" }]); },});
test({ name: '"a" vs "a, b"', fn(): void { assertEquals(diff(["a"], ["a", "b"]), [ { type: "common", value: "a" }, { type: "added", value: "b" }, ]); },});
test({ name: '"strength" vs "string"', fn(): void { assertEquals(diff(Array.from("strength"), Array.from("string")), [ { type: "common", value: "s" }, { type: "common", value: "t" }, { type: "common", value: "r" }, { type: "removed", value: "e" }, { type: "added", value: "i" }, { type: "common", value: "n" }, { type: "common", value: "g" }, { type: "removed", value: "t" }, { type: "removed", value: "h" }, ]); },});
test({ name: '"strength" vs ""', fn(): void { assertEquals(diff(Array.from("strength"), Array.from("")), [ { type: "removed", value: "s" }, { type: "removed", value: "t" }, { type: "removed", value: "r" }, { type: "removed", value: "e" }, { type: "removed", value: "n" }, { type: "removed", value: "g" }, { type: "removed", value: "t" }, { type: "removed", value: "h" }, ]); },});
test({ name: '"" vs "strength"', fn(): void { assertEquals(diff(Array.from(""), Array.from("strength")), [ { type: "added", value: "s" }, { type: "added", value: "t" }, { type: "added", value: "r" }, { type: "added", value: "e" }, { type: "added", value: "n" }, { type: "added", value: "g" }, { type: "added", value: "t" }, { type: "added", value: "h" }, ]); },});
test({ name: '"abc", "c" vs "abc", "bcd", "c"', fn(): void { assertEquals(diff(["abc", "c"], ["abc", "bcd", "c"]), [ { type: "common", value: "abc" }, { type: "added", value: "bcd" }, { type: "common", value: "c" }, ]); },});