test: tighten shared usage helper coverage

src/infra/provider-usage.shared.test.ts

@@ -2,24 +2,36 @@ import { describe, expect, it } from "vitest";
 import { clampPercent, resolveUsageProviderId, withTimeout } from "./provider-usage.shared.js";
 
 describe("provider-usage.shared", () => {
-  it("normalizes supported usage provider ids", () => {
-    expect(resolveUsageProviderId("z-ai")).toBe("zai");
-    expect(resolveUsageProviderId(" GOOGLE-GEMINI-CLI ")).toBe("google-gemini-cli");
-    expect(resolveUsageProviderId("unknown-provider")).toBeUndefined();
-    expect(resolveUsageProviderId()).toBeUndefined();
+  it.each([
+    { value: "z-ai", expected: "zai" },
+    { value: " GOOGLE-GEMINI-CLI ", expected: "google-gemini-cli" },
+    { value: "unknown-provider", expected: undefined },
+    { value: undefined, expected: undefined },
+    { value: null, expected: undefined },
+  ])("normalizes provider ids for %j", ({ value, expected }) => {
+    expect(resolveUsageProviderId(value)).toBe(expected);
   });
 
-  it("clamps usage percents and handles non-finite values", () => {
-    expect(clampPercent(-5)).toBe(0);
-    expect(clampPercent(120)).toBe(100);
-    expect(clampPercent(Number.NaN)).toBe(0);
-    expect(clampPercent(Number.POSITIVE_INFINITY)).toBe(0);
+  it.each([
+    { value: -5, expected: 0 },
+    { value: 42, expected: 42 },
+    { value: 120, expected: 100 },
+    { value: Number.NaN, expected: 0 },
+    { value: Number.POSITIVE_INFINITY, expected: 0 },
+  ])("clamps usage percents for %j", ({ value, expected }) => {
+    expect(clampPercent(value)).toBe(expected);
   });
 
   it("returns work result when it resolves before timeout", async () => {
     await expect(withTimeout(Promise.resolve("ok"), 100, "fallback")).resolves.toBe("ok");
   });
 
+  it("propagates work errors before timeout", async () => {
+    await expect(withTimeout(Promise.reject(new Error("boom")), 100, "fallback")).rejects.toThrow(
+      "boom",
+    );
+  });
+
   it("returns fallback when timeout wins", async () => {
     const late = new Promise<string>((resolve) => setTimeout(() => resolve("late"), 50));
     await expect(withTimeout(late, 1, "fallback")).resolves.toBe("fallback");