feat(tests): adding tests for relations

Author: marcjulian

__tests__/fixtures/datamodels.ts

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+export const datamodelOneToOne = /* Prisma */ `
+  model User {
+    id Int @id @default(autoincrement())
+    name String
+    profile   Profile?
+  }
+  model Profile {
+    id Int @id @default(autoincrement())
+    name String
+    user   User    @relation(fields: [userId], references: [id])
+    userId Int
+  }
+`;
+
+export const datamodelManyToOne = /* Prisma */ `
+  model User {
+    id Int @id @default(autoincrement())
+    name String
+    posts   Post[]
+  }
+  model Post {
+    id Int @id @default(autoincrement())
+    name String
+    author   User    @relation(fields: [authorId], references: [id])
+    authorId Int
+  }
+`;

__tests__/relations.test.ts

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+import { generateDMMF } from './utils/generateDMMF';
+import { datamodelOneToOne, datamodelManyToOne } from './fixtures/datamodels';
+import { generateRelations } from '../src/generator/relations';
+
+describe('Relations', () => {
+  test('generating one-to-one relationship', async () => {
+    const dmmf = await generateDMMF(datamodelOneToOne);
+
+    const expected = 'Ref: Profile.userId - User.id';
+
+    const relations = generateRelations(dmmf.datamodel.models);
+    expect(relations[0]).toMatch(expected);
+  });
+
+  test('generating many-to-one relationship', async () => {
+    const dmmf = await generateDMMF(datamodelManyToOne);
+
+    const expected = 'Ref: Post.authorId > User.id';
+
+    const relations = generateRelations(dmmf.datamodel.models);
+    expect(relations[0]).toMatch(expected);
+  });
+});

__tests__/utils/generateDMMF.ts

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+import { getDMMF } from '@prisma/sdk';
+import { DMMF } from '@prisma/generator-helper';
+
+export function generateDMMF(datamodel: string): Promise<DMMF.Document> {
+  return getDMMF({ datamodel });
+}

jest.config.js

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+module.exports = {
+  preset: 'ts-jest',
+  testEnvironment: 'node',
+  testPathIgnorePatterns: [
+    '<rootDir>/__tests__/fixtures/',
+    '<rootDir>/__tests__/utils/',
+  ],
+};