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map_test.ts
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map_test.ts
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import {
assertEquals,
assertThrowsAsync,
} from "https://deno.land/[email protected]/testing/asserts.ts";
import {
getFirst,
getLines,
getLinesNonEmpty,
getSuccess,
getText,
map,
mapAsync,
pipe,
} from "./map.ts";
Deno.test("getFirst gets first element", async () => {
assertEquals(
await getFirst(Promise.resolve([1, 2, 3])),
1,
);
});
Deno.test("getFirst throws if array is empty", async () => {
await assertThrowsAsync(
() => getFirst(Promise.resolve([])),
Error,
"empty",
);
});
Deno.test("getLines preserves empty lines", async () => {
const buf = new TextEncoder().encode("hello\n\nworld");
assertEquals(
await getLines(Promise.resolve(buf)),
["hello", "", "world"],
);
});
Deno.test("getLinesNonEmpty removes empty lines", async () => {
const buf = new TextEncoder().encode("hello\n\nworld");
assertEquals(
await getLinesNonEmpty(Promise.resolve(buf)),
["hello", "world"],
);
});
Deno.test("getSuccess is true if promise resolves", async () => {
assertEquals(
await getSuccess(Promise.resolve(42)),
true,
);
});
Deno.test("getSuccess is false if promise is rejected", async () => {
assertEquals(
await getSuccess(Promise.reject(42)),
false,
);
});
Deno.test("getText converts buffer to text", async () => {
const buf = new TextEncoder().encode("hello");
assertEquals(
await getText(Promise.resolve(buf)),
"hello",
);
});
Deno.test("map resolves correctly", async () => {
assertEquals(
await map((x: number) => x * 2)(Promise.resolve(21)),
42,
);
});
Deno.test("mapAsync resolves correctly", async () => {
assertEquals(
await mapAsync((x: number) => Promise.resolve(x * 2))(Promise.resolve(21)),
42,
);
});
Deno.test("pipe combines two function", () => {
assertEquals(
pipe((x: number) => x * 2, (x) => x * 3)(2),
12,
);
});