1 files changed, 55 insertions, 0 deletions
diff --git a/tests/unit/tty_color_test.ts b/tests/unit/tty_color_test.ts
new file mode 100644
index 000000000..6f26891e3
--- /dev/null
+++ b/tests/unit/tty_color_test.ts
@@ -0,0 +1,55 @@
+// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
+import { assertEquals } from "./test_util.ts";
+
+// Note tests for Deno.stdin.setRaw is in integration tests.
+
+Deno.test(
+  { permissions: { run: true, read: true } },
+  async function noColorIfNotTty() {
+    const { stdout } = await new Deno.Command(Deno.execPath(), {
+      args: ["eval", "console.log(1)"],
+    }).output();
+    const output = new TextDecoder().decode(stdout);
+    assertEquals(output, "1\n");
+  },
+);
+
+Deno.test(
+  { permissions: { run: true, read: true } },
+  async function denoNoColorIsNotAffectedByNonTty() {
+    const { stdout } = await new Deno.Command(Deno.execPath(), {
+      args: ["eval", "console.log(Deno.noColor)"],
+    }).output();
+    const output = new TextDecoder().decode(stdout);
+    assertEquals(output, "false\n");
+  },
+);
+
+Deno.test(
+  { permissions: { run: true, read: true } },
+  async function denoNoColorTrueEmptyVar() {
+    const { stdout } = await new Deno.Command(Deno.execPath(), {
+      args: ["eval", "console.log(Deno.noColor)"],
+      env: {
+        // https://no-color.org/ -- should not be true when empty
+        NO_COLOR: "",
+      },
+    }).output();
+    const output = new TextDecoder().decode(stdout);
+    assertEquals(output, "false\n");
+  },
+);
+
+Deno.test(
+  { permissions: { run: true, read: true } },
+  async function denoNoColorTrueEmptyVar() {
+    const { stdout } = await new Deno.Command(Deno.execPath(), {
+      args: ["eval", "console.log(Deno.noColor)"],
+      env: {
+        NO_COLOR: "1",
+      },
+    }).output();
+    const output = new TextDecoder().decode(stdout);
+    assertEquals(output, "true\n");
+  },
+);