diff --git a/src/infra/cli-root-options.test.ts b/src/infra/cli-root-options.test.ts
index 514548586f7..e6907984ec0 100644
--- a/src/infra/cli-root-options.test.ts
+++ b/src/infra/cli-root-options.test.ts
@@ -1,16 +1,32 @@
 import { describe, expect, it } from "vitest";
-import { consumeRootOptionToken } from "./cli-root-options.js";
+import { consumeRootOptionToken, isValueToken } from "./cli-root-options.js";
 
-describe("consumeRootOptionToken", () => {
-  it("consumes boolean and inline root options", () => {
-    expect(consumeRootOptionToken(["--dev"], 0)).toBe(1);
-    expect(consumeRootOptionToken(["--profile=work"], 0)).toBe(1);
-    expect(consumeRootOptionToken(["--log-level=debug"], 0)).toBe(1);
-  });
-
-  it("consumes split root value option only when next token is a value", () => {
-    expect(consumeRootOptionToken(["--profile", "work"], 0)).toBe(2);
-    expect(consumeRootOptionToken(["--profile", "--no-color"], 0)).toBe(1);
-    expect(consumeRootOptionToken(["--profile", "--"], 0)).toBe(1);
+describe("isValueToken", () => {
+  it.each([
+    { value: "work", expected: true },
+    { value: "-1", expected: true },
+    { value: "-1.5", expected: true },
+    { value: "--", expected: false },
+    { value: "--dev", expected: false },
+    { value: undefined, expected: false },
+  ])("classifies %j", ({ value, expected }) => {
+    expect(isValueToken(value)).toBe(expected);
+  });
+});
+
+describe("consumeRootOptionToken", () => {
+  it.each([
+    { args: ["--dev"], index: 0, expected: 1 },
+    { args: ["--profile=work"], index: 0, expected: 1 },
+    { args: ["--log-level=debug"], index: 0, expected: 1 },
+    { args: ["--profile", "work"], index: 0, expected: 2 },
+    { args: ["--profile", "-1"], index: 0, expected: 2 },
+    { args: ["--log-level", "-1.5"], index: 0, expected: 2 },
+    { args: ["--profile", "--no-color"], index: 0, expected: 1 },
+    { args: ["--profile", "--"], index: 0, expected: 1 },
+    { args: ["--unknown"], index: 0, expected: 0 },
+    { args: [], index: 0, expected: 0 },
+  ])("consumes %j at %d", ({ args, index, expected }) => {
+    expect(consumeRootOptionToken(args, index)).toBe(expected);
   });
 });