Finish backlog cleanup for Pi integration

tests/service-tier.test.ts

@@ -0,0 +1,41 @@
+import test from "node:test";
+import assert from "node:assert/strict";
+import { mkdtempSync, readFileSync } from "node:fs";
+import { tmpdir } from "node:os";
+import { join } from "node:path";
+
+import {
+	getConfiguredServiceTier,
+	normalizeServiceTier,
+	resolveProviderServiceTier,
+	setConfiguredServiceTier,
+} from "../src/model/service-tier.js";
+
+test("normalizeServiceTier accepts supported values only", () => {
+	assert.equal(normalizeServiceTier("priority"), "priority");
+	assert.equal(normalizeServiceTier("standard_only"), "standard_only");
+	assert.equal(normalizeServiceTier("FAST"), undefined);
+	assert.equal(normalizeServiceTier(undefined), undefined);
+});
+
+test("setConfiguredServiceTier persists and clears settings.json values", () => {
+	const dir = mkdtempSync(join(tmpdir(), "feynman-service-tier-"));
+	const settingsPath = join(dir, "settings.json");
+
+	setConfiguredServiceTier(settingsPath, "priority");
+	assert.equal(getConfiguredServiceTier(settingsPath), "priority");
+
+	const persisted = JSON.parse(readFileSync(settingsPath, "utf8")) as { serviceTier?: string };
+	assert.equal(persisted.serviceTier, "priority");
+
+	setConfiguredServiceTier(settingsPath, undefined);
+	assert.equal(getConfiguredServiceTier(settingsPath), undefined);
+});
+
+test("resolveProviderServiceTier filters unsupported provider+tier pairs", () => {
+	assert.equal(resolveProviderServiceTier("openai", "priority"), "priority");
+	assert.equal(resolveProviderServiceTier("openai-codex", "flex"), "flex");
+	assert.equal(resolveProviderServiceTier("anthropic", "standard_only"), "standard_only");
+	assert.equal(resolveProviderServiceTier("anthropic", "priority"), undefined);
+	assert.equal(resolveProviderServiceTier("google", "priority"), undefined);
+});