microsoft/typespec
Publicmirrored from https://github.com/microsoft/typespecAvailable
packages/asset-emitter/test/host.ts
67lines · modecode
| 1 | import { resolvePath } from "@typespec/compiler"; |
| 2 | import { createTester, mockFile } from "@typespec/compiler/testing"; |
| 3 | import { expect, type MockInstance, vi } from "vitest"; |
| 4 | import { createAssetEmitter, TypeEmitter } from "../src/index.js"; |
| 5 | |
| 6 | const Tester = createTester(resolvePath(import.meta.dirname, ".."), { |
| 7 | libraries: [], |
| 8 | }); |
| 9 | |
| 10 | export async function getHostForTypeSpecFile(contents: string, decorators?: Record<string, any>) { |
| 11 | let tester = Tester; |
| 12 | if (decorators) { |
| 13 | tester = tester.files({ "dec.js": mockFile.js(decorators) }); |
| 14 | contents = `import "./dec.js";\n` + contents; |
| 15 | } |
| 16 | const [result] = await tester.compileAndDiagnose(contents, { |
| 17 | compilerOptions: { outputDir: "tsp-output" }, |
| 18 | }); |
| 19 | return { program: result.program, compilerHost: result.fs.compilerHost }; |
| 20 | } |
| 21 | |
| 22 | export async function emitTypeSpec( |
| 23 | Emitter: typeof TypeEmitter<any>, |
| 24 | code: string, |
| 25 | callCounts: Partial<Record<keyof TypeEmitter<any>, number>> = {}, |
| 26 | validateCallCounts = true, |
| 27 | ) { |
| 28 | const host = await getHostForTypeSpecFile(code); |
| 29 | const emitter = createAssetEmitter(host.program, Emitter, { |
| 30 | emitterOutputDir: "tsp-output", |
| 31 | options: {}, |
| 32 | } as any); |
| 33 | const spies = emitterSpies(Emitter); |
| 34 | emitter.emitProgram(); |
| 35 | await emitter.writeOutput(); |
| 36 | if (validateCallCounts) { |
| 37 | assertSpiesCalled(spies, callCounts); |
| 38 | } |
| 39 | return emitter; |
| 40 | } |
| 41 | |
| 42 | type EmitterSpies = Record<string, MockInstance<any>>; |
| 43 | function emitterSpies(emitter: typeof TypeEmitter<any, any>) { |
| 44 | const spies: EmitterSpies = {}; |
| 45 | const methods = Object.getOwnPropertyNames(emitter.prototype); |
| 46 | for (const key of methods) { |
| 47 | if (key === "constructor") continue; |
| 48 | if ((emitter.prototype as any)[key].restore) { |
| 49 | // assume this whole thing is already spied. |
| 50 | return spies; |
| 51 | } |
| 52 | if (typeof (emitter.prototype as any)[key] !== "function") continue; |
| 53 | spies[key] = vi.spyOn(emitter.prototype, key as any); |
| 54 | } |
| 55 | |
| 56 | return spies; |
| 57 | } |
| 58 | |
| 59 | function assertSpiesCalled( |
| 60 | spies: EmitterSpies, |
| 61 | callCounts: Partial<Record<keyof TypeEmitter<any>, number>>, |
| 62 | ) { |
| 63 | for (const [key, spy] of Object.entries(spies)) { |
| 64 | const expectedCount = (callCounts as any)[key] ?? 1; |
| 65 | expect(spy).toHaveBeenCalledTimes(expectedCount); |
| 66 | } |
| 67 | } |
| 68 | |