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test(fmt): add test cases for printf() #5278

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Jul 4, 2024
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test(fmt): add test cases for printf() #5278

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27 changes: 25 additions & 2 deletions fmt/printf_test.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -5,8 +5,9 @@
// https://golang.org/src/fmt/fmt_test.go
// BSD: Copyright (c) 2009 The Go Authors. All rights reserved.

import { sprintf } from "./printf.ts";
import { assertEquals } from "@std/assert";
import { printf, sprintf } from "./printf.ts";
import { assertEquals, assertThrows } from "@std/assert";
import { assertSpyCall, spy } from "@std/testing/mock";

Deno.test("sprintf() handles noVerb", function () {
assertEquals(sprintf("bla"), "bla");
Expand Down Expand Up @@ -108,6 +109,7 @@ Deno.test("sprintf() handles floats", function () {
assertEquals(sprintf("%e", Number.MIN_SAFE_INTEGER), "-9.007199e+15");
assertEquals(sprintf("%.3e", 1.9999), "2.000e+00");
assertEquals(sprintf("%.3e", 29.99999), "3.000e+01");
assertEquals(sprintf("%.3e", 999999), "1.000e+06");
});
Deno.test("sprintf() handles floatE", function () {
assertEquals(sprintf("%E", 4), "4.000000E+00");
Expand Down Expand Up @@ -169,6 +171,13 @@ Deno.test("sprintf() handles string", function () {
Deno.test("sprintf() handles hex", function () {
assertEquals(sprintf("%x", "123"), "313233");
assertEquals(sprintf("%x", "n"), "6e");

// hex throws with non-strings and non-numbers
assertThrows(
() => sprintf("%x", {}),
Error,
"currently only number and string are implemented for hex",
);
});
Deno.test("sprintf() handles heX", function () {
assertEquals(sprintf("%X", "123"), "313233");
Expand Down Expand Up @@ -641,6 +650,7 @@ Deno.test("sprintf() handles formatV", function () {
}`,
);
assertEquals(sprintf("%#.1v", a), `{ a: { a: [Object] } }`);
assertEquals(sprintf("%.10v", a), "[object Ob"); // truncated at 10th char
});

Deno.test("sprintf() handles formatJ", function () {
Expand Down Expand Up @@ -716,3 +726,16 @@ Deno.test("sprintf() handles errors", function () {
assertEquals(sprintf("%.[5]f"), "%!(BAD INDEX)");
assertEquals(sprintf("%.[5]*f"), "%!(BAD INDEX)");
});

Deno.test("sprintf() throws with d with sharp option", () => {
assertThrows(() => sprintf("%#d", 1.1), Error, "cannot handle base: 10");
});

Deno.test("printf() prints the result synchronously", () => {
using writeSpy = spy(Deno.stdout, "writeSync");
printf("Hello %s", "world");

assertSpyCall(writeSpy, 0, {
args: [new TextEncoder().encode("Hello world")],
});
});