test(cli): adding more test for prisma format (#6234)

src/packages/cli/src/__tests__/__snapshots__/format.test.ts.snap

@@ -37,3 +37,27 @@ model User {
 }
 
 `;
+
+exports[`format should add missing backrelation 1`] = `
+generator client {
+  provider = "prisma-client-js"
+  output = "***"
+}
+
+datasource db {
+  provider = "sqlite"
+  url = "***"
+}
+
+model Post {
+  id     Int  @id
+  user   User @relation(fields: [userId], references: [id])
+  userId Int
+}
+
+model User {
+  id    Int    @id
+  posts Post[]
+}
+
+`;

src/packages/cli/src/__tests__/fixtures/example-project/prisma/broken.prisma

@@ -0,0 +1 @@
+it has broken schema

src/packages/cli/src/__tests__/fixtures/example-project/prisma/missing-backrelation.prisma

@@ -0,0 +1,19 @@
+generator client {
+  provider = "prisma-client-js"
+  output   = "../generated/client"
+}
+
+datasource db {
+  provider = "sqlite"
+  url      = "file:dev.db"
+}
+
+model Post {
+  id     Int @id
+  user   User
+}
+
+model User {
+  id     Int @id
+  posts  Post[]
+}

src/packages/cli/src/__tests__/format.test.ts

@@ -9,3 +9,16 @@ it('format should add a trailing EOL', async () => {
   await Format.new().parse([])
   expect(fs.read('schema.prisma')).toMatchSnapshot()
 })
+
+it('format should add missing backrelation', async () => {
+  ctx.fixture('example-project/prisma')
+  await Format.new().parse(['--schema=missing-backrelation.prisma'])
+  expect(fs.read('missing-backrelation.prisma')).toMatchSnapshot()
+})
+
+it('format should throw if schema is broken', async () => {
+  ctx.fixture('example-project/prisma')
+  await expect(
+    Format.new().parse(['--schema=broken.prisma']),
+  ).rejects.toThrowError()
+})