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| 1 | +import { describe, it, expect, afterEach } from "vitest"; |
| 2 | +import http from "node:http"; |
| 3 | +import { resolveStrictMode, strictOverrideField } from "../helpers.js"; |
| 4 | +import { createServer, type ServerInstance } from "../server.js"; |
| 5 | +import type { Fixture, ChatCompletionRequest } from "../types.js"; |
| 6 | + |
| 7 | +// --------------------------------------------------------------------------- |
| 8 | +// Helpers |
| 9 | +// --------------------------------------------------------------------------- |
| 10 | + |
| 11 | +async function httpPost( |
| 12 | + url: string, |
| 13 | + body: object, |
| 14 | + headers?: Record<string, string>, |
| 15 | +): Promise<{ status: number; body: string }> { |
| 16 | + return new Promise((resolve, reject) => { |
| 17 | + const req = http.request( |
| 18 | + url, |
| 19 | + { |
| 20 | + method: "POST", |
| 21 | + headers: { |
| 22 | + "Content-Type": "application/json", |
| 23 | + ...headers, |
| 24 | + }, |
| 25 | + }, |
| 26 | + (res) => { |
| 27 | + const chunks: Buffer[] = []; |
| 28 | + res.on("data", (c) => chunks.push(c)); |
| 29 | + res.on("end", () => |
| 30 | + resolve({ |
| 31 | + status: res.statusCode!, |
| 32 | + body: Buffer.concat(chunks).toString(), |
| 33 | + }), |
| 34 | + ); |
| 35 | + }, |
| 36 | + ); |
| 37 | + req.on("error", reject); |
| 38 | + req.write(JSON.stringify(body)); |
| 39 | + req.end(); |
| 40 | + }); |
| 41 | +} |
| 42 | + |
| 43 | +function chatRequest(userContent: string): ChatCompletionRequest { |
| 44 | + return { |
| 45 | + model: "gpt-4", |
| 46 | + messages: [{ role: "user", content: userContent }], |
| 47 | + }; |
| 48 | +} |
| 49 | + |
| 50 | +// --------------------------------------------------------------------------- |
| 51 | +// Unit tests: resolveStrictMode |
| 52 | +// --------------------------------------------------------------------------- |
| 53 | + |
| 54 | +describe("resolveStrictMode", () => { |
| 55 | + it("returns server default when no header", () => { |
| 56 | + expect(resolveStrictMode(false)).toBe(false); |
| 57 | + expect(resolveStrictMode(true)).toBe(true); |
| 58 | + expect(resolveStrictMode(undefined)).toBe(false); |
| 59 | + }); |
| 60 | + |
| 61 | + it("returns server default when headers are empty", () => { |
| 62 | + expect(resolveStrictMode(false, {})).toBe(false); |
| 63 | + expect(resolveStrictMode(true, {})).toBe(true); |
| 64 | + }); |
| 65 | + |
| 66 | + it('header "true" overrides server default false', () => { |
| 67 | + expect(resolveStrictMode(false, { "x-aimock-strict": "true" })).toBe(true); |
| 68 | + }); |
| 69 | + |
| 70 | + it('header "1" overrides server default false', () => { |
| 71 | + expect(resolveStrictMode(false, { "x-aimock-strict": "1" })).toBe(true); |
| 72 | + }); |
| 73 | + |
| 74 | + it('header "false" overrides server default true', () => { |
| 75 | + expect(resolveStrictMode(true, { "x-aimock-strict": "false" })).toBe(false); |
| 76 | + }); |
| 77 | + |
| 78 | + it('header "0" overrides server default true', () => { |
| 79 | + expect(resolveStrictMode(true, { "x-aimock-strict": "0" })).toBe(false); |
| 80 | + }); |
| 81 | + |
| 82 | + it("ignores unrecognised header values and falls back to server default", () => { |
| 83 | + expect(resolveStrictMode(true, { "x-aimock-strict": "yes" })).toBe(true); |
| 84 | + expect(resolveStrictMode(false, { "x-aimock-strict": "maybe" })).toBe(false); |
| 85 | + }); |
| 86 | +}); |
| 87 | + |
| 88 | +// --------------------------------------------------------------------------- |
| 89 | +// Unit tests: strictOverrideField |
| 90 | +// --------------------------------------------------------------------------- |
| 91 | + |
| 92 | +describe("strictOverrideField", () => { |
| 93 | + it("returns strictOverride when header overrides server default", () => { |
| 94 | + expect(strictOverrideField(false, { "x-aimock-strict": "true" })).toEqual({ |
| 95 | + strictOverride: true, |
| 96 | + }); |
| 97 | + expect(strictOverrideField(true, { "x-aimock-strict": "false" })).toEqual({ |
| 98 | + strictOverride: false, |
| 99 | + }); |
| 100 | + }); |
| 101 | + |
| 102 | + it("returns empty object when no override", () => { |
| 103 | + expect(strictOverrideField(false, {})).toEqual({}); |
| 104 | + expect(strictOverrideField(true, { "x-aimock-strict": "true" })).toEqual({}); |
| 105 | + expect(strictOverrideField(false)).toEqual({}); |
| 106 | + expect(strictOverrideField(undefined)).toEqual({}); |
| 107 | + }); |
| 108 | +}); |
| 109 | + |
| 110 | +// --------------------------------------------------------------------------- |
| 111 | +// Integration tests: per-request strict header |
| 112 | +// --------------------------------------------------------------------------- |
| 113 | + |
| 114 | +describe("X-AIMock-Strict header integration", () => { |
| 115 | + let server: ServerInstance; |
| 116 | + const helloFixture: Fixture = { |
| 117 | + match: { userMessage: "hello" }, |
| 118 | + response: { content: "Hi there!" }, |
| 119 | + }; |
| 120 | + |
| 121 | + afterEach(async () => { |
| 122 | + if (server) { |
| 123 | + await new Promise<void>((resolve) => server.server.close(() => resolve())); |
| 124 | + } |
| 125 | + }); |
| 126 | + |
| 127 | + it("server with --strict + header false returns 404 not 503", async () => { |
| 128 | + server = await createServer([helloFixture], { port: 0, strict: true }); |
| 129 | + const res = await httpPost(`${server.url}/v1/chat/completions`, chatRequest("unmatched"), { |
| 130 | + "X-AIMock-Strict": "false", |
| 131 | + }); |
| 132 | + expect(res.status).toBe(404); |
| 133 | + const body = JSON.parse(res.body); |
| 134 | + expect(body.error.message).toBe("No fixture matched"); |
| 135 | + }); |
| 136 | + |
| 137 | + it("server without --strict + header true returns 503 not 404", async () => { |
| 138 | + server = await createServer([helloFixture], { port: 0 }); |
| 139 | + const res = await httpPost(`${server.url}/v1/chat/completions`, chatRequest("unmatched"), { |
| 140 | + "X-AIMock-Strict": "true", |
| 141 | + }); |
| 142 | + expect(res.status).toBe(503); |
| 143 | + const body = JSON.parse(res.body); |
| 144 | + expect(body.error.message).toBe("Strict mode: no fixture matched"); |
| 145 | + }); |
| 146 | + |
| 147 | + it("header works on chat completions endpoint with matched fixture", async () => { |
| 148 | + server = await createServer([helloFixture], { port: 0 }); |
| 149 | + // Header should not affect matched requests — fixture still serves |
| 150 | + const res = await httpPost(`${server.url}/v1/chat/completions`, chatRequest("hello"), { |
| 151 | + "X-AIMock-Strict": "true", |
| 152 | + }); |
| 153 | + expect(res.status).toBe(200); |
| 154 | + }); |
| 155 | + |
| 156 | + it("header 1 enables strict mode", async () => { |
| 157 | + server = await createServer([helloFixture], { port: 0 }); |
| 158 | + const res = await httpPost(`${server.url}/v1/chat/completions`, chatRequest("unmatched"), { |
| 159 | + "X-AIMock-Strict": "1", |
| 160 | + }); |
| 161 | + expect(res.status).toBe(503); |
| 162 | + }); |
| 163 | + |
| 164 | + it("header 0 disables strict mode", async () => { |
| 165 | + server = await createServer([helloFixture], { port: 0, strict: true }); |
| 166 | + const res = await httpPost(`${server.url}/v1/chat/completions`, chatRequest("unmatched"), { |
| 167 | + "X-AIMock-Strict": "0", |
| 168 | + }); |
| 169 | + expect(res.status).toBe(404); |
| 170 | + }); |
| 171 | + |
| 172 | + it("absent header falls back to server default", async () => { |
| 173 | + // No header at all — server default (strict: true) applies |
| 174 | + server = await createServer([helloFixture], { port: 0, strict: true }); |
| 175 | + const res = await httpPost(`${server.url}/v1/chat/completions`, chatRequest("unmatched")); |
| 176 | + expect(res.status).toBe(503); |
| 177 | + const body = JSON.parse(res.body); |
| 178 | + expect(body.error.message).toBe("Strict mode: no fixture matched"); |
| 179 | + }); |
| 180 | + |
| 181 | + it("absent header falls back to server default (non-strict)", async () => { |
| 182 | + // No header at all — server default (strict: false) applies |
| 183 | + server = await createServer([helloFixture], { port: 0 }); |
| 184 | + const res = await httpPost(`${server.url}/v1/chat/completions`, chatRequest("unmatched")); |
| 185 | + expect(res.status).toBe(404); |
| 186 | + const body = JSON.parse(res.body); |
| 187 | + expect(body.error.message).toBe("No fixture matched"); |
| 188 | + }); |
| 189 | + |
| 190 | + it("records strictOverride in journal when header overrides server default", async () => { |
| 191 | + server = await createServer([helloFixture], { port: 0 }); |
| 192 | + const res = await httpPost(`${server.url}/v1/chat/completions`, chatRequest("unmatched"), { |
| 193 | + "X-AIMock-Strict": "true", |
| 194 | + }); |
| 195 | + expect(res.status).toBe(503); |
| 196 | + const entries = server.journal.getAll(); |
| 197 | + expect(entries.length).toBe(1); |
| 198 | + expect(entries[0].response.strictOverride).toBe(true); |
| 199 | + }); |
| 200 | + |
| 201 | + it("does not record strictOverride when header matches server default", async () => { |
| 202 | + server = await createServer([helloFixture], { port: 0, strict: true }); |
| 203 | + const res = await httpPost(`${server.url}/v1/chat/completions`, chatRequest("unmatched"), { |
| 204 | + "X-AIMock-Strict": "true", |
| 205 | + }); |
| 206 | + expect(res.status).toBe(503); |
| 207 | + const entries = server.journal.getAll(); |
| 208 | + expect(entries.length).toBe(1); |
| 209 | + expect(entries[0].response.strictOverride).toBeUndefined(); |
| 210 | + }); |
| 211 | + |
| 212 | + it("records strictOverride=false when header disables strict on strict server", async () => { |
| 213 | + server = await createServer([helloFixture], { port: 0, strict: true }); |
| 214 | + const res = await httpPost(`${server.url}/v1/chat/completions`, chatRequest("unmatched"), { |
| 215 | + "X-AIMock-Strict": "false", |
| 216 | + }); |
| 217 | + expect(res.status).toBe(404); |
| 218 | + const entries = server.journal.getAll(); |
| 219 | + expect(entries.length).toBe(1); |
| 220 | + expect(entries[0].response.strictOverride).toBe(false); |
| 221 | + }); |
| 222 | +}); |
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