test(fmt,internal,cli/unstable): fix test failures with NO_COLOR

cli/unstable_spinner_test.ts

@@ -2,11 +2,14 @@
 import { assertEquals } from "@std/assert";
 import { Spinner } from "./unstable_spinner.ts";
 import { restore, stub } from "@std/testing/mock";
+import { stubProperty } from "@std/testing/unstable-stub-property";
 import { FakeTime } from "@std/testing/time";
 
 const decoder = new TextDecoder();
 
 Deno.test("Spinner can start and stop", async () => {
+  // Spinner.start() reads Deno.noColor, so enable colors while this test runs.
+  using _ = stubProperty(Deno, "noColor", false);
   try {
     const expectedOutput = [
       "\r\x1b[K⠋\x1b[0m Loading...",
@@ -49,6 +52,7 @@ Deno.test("Spinner can start and stop", async () => {
 });
 
 Deno.test("Spinner constructor accepts spinner", async () => {
+  using _ = stubProperty(Deno, "noColor", false);
   try {
     const expectedOutput = [
       "\r\x1b[K0\x1b[0m ",
@@ -93,6 +97,7 @@ Deno.test("Spinner constructor accepts spinner", async () => {
 });
 
 Deno.test("Spinner constructor accepts message", async () => {
+  using _ = stubProperty(Deno, "noColor", false);
   try {
     const expectedOutput = [
       "\r\x1b[K⠋\x1b[0m Spinning with Deno 🦕",
@@ -128,6 +133,7 @@ Deno.test("Spinner constructor accepts message", async () => {
 });
 
 Deno.test("Spinner constructor accepts interval", async () => {
+  using _ = stubProperty(Deno, "noColor", false);
   try {
     using time = new FakeTime();
     const expectedOutput = [
@@ -161,6 +167,7 @@ Deno.test("Spinner constructor accepts interval", async () => {
 });
 
 Deno.test("Spinner constructor accepts output", async () => {
+  using _ = stubProperty(Deno, "noColor", false);
   try {
     const expectedOutput = [
       "\r\x1b[K⠋\x1b[0m ",
@@ -203,6 +210,7 @@ Deno.test("Spinner constructor accepts output", async () => {
 });
 
 Deno.test("Spinner constructor accepts each color", async (t) => {
+  using _ = stubProperty(Deno, "noColor", false);
   await t.step("black", async () => {
     try {
       const expectedOutput = [
@@ -521,6 +529,7 @@ Deno.test("Spinner constructor accepts each color", async (t) => {
 });
 
 Deno.test("Spinner.color can set each color", async () => {
+  using _ = stubProperty(Deno, "noColor", false);
   try {
     const expectedOutput = [
       "\r\x1b[K⠋\x1b[0m ",
@@ -588,6 +597,7 @@ Deno.test("Spinner.color can get each color", () => {
 });
 
 Deno.test("Spinner.message can be updated", async () => {
+  using _ = stubProperty(Deno, "noColor", false);
   try {
     const expectedOutput = [
       "\r\x1b[K⠋\x1b[0m One dino 🦕",

fmt/colors_test.ts

@@ -1,6 +1,10 @@
 // Copyright 2018-2026 the Deno authors. MIT license.
 import { assertEquals } from "@std/assert";
-import * as c from "./colors.ts";
+import { stubProperty } from "@std/testing/unstable-stub-property";
+
+// Enable colors before importing to prevent test failures when NO_COLOR=1.
+using _ = stubProperty(Deno, "noColor", false);
+const c = await import("./colors.ts");
 
 Deno.test("reset()", function () {
   assertEquals(c.reset("foo bar"), "foo bar");
@@ -19,6 +23,9 @@ Deno.test("red() replaces close characters", function () {
 });
 
 Deno.test("getColorEnabled() handles enabled colors", function () {
+  // setColorEnabled() ignores changes while Deno.noColor is true.
+  // Stub it again during this test so NO_COLOR cannot prevent toggling colors.
+  using _ = stubProperty(Deno, "noColor", false);
   assertEquals(c.getColorEnabled(), true);
   c.setColorEnabled(false);
   assertEquals(c.bgBlue(c.red("foo bar")), "foo bar");

fmt/printf_test.ts

@@ -5,10 +5,14 @@
 //   https://golang.org/src/fmt/fmt_test.go
 //   BSD: Copyright (c) 2009 The Go Authors. All rights reserved.
 
-import { printf, sprintf } from "./printf.ts";
 import { assertEquals, assertThrows } from "@std/assert";
 import { assertSpyCall, spy, stub } from "@std/testing/mock";
-import * as c from "./colors.ts";
+import { stubProperty } from "@std/testing/unstable-stub-property";
+
+// Enable colors before importing to prevent test failures when NO_COLOR=1.
+using _ = stubProperty(Deno, "noColor", false);
+const { printf, sprintf } = await import("./printf.ts");
+const c = await import("./colors.ts");
 
 Deno.test("sprintf() handles noVerb", function () {
   assertEquals(sprintf("bla"), "bla");

internal/styles_test.ts

@@ -1,6 +1,11 @@
 // Copyright 2018-2026 the Deno authors. MIT license.
-import { assertEquals } from "@std/assert";
-import * as c from "./styles.ts";
+import { stubProperty } from "@std/testing/unstable-stub-property";
+
+// styles.ts captures Deno.noColor on import and is also loaded by @std/assert.
+// Enable colors before importing either module.
+using _ = stubProperty(Deno, "noColor", false);
+const { assertEquals } = await import("@std/assert");
+const c = await import("./styles.ts");
 
 Deno.test("red() single color", function () {
   assertEquals(c.red("foo bar"), "foo bar");