test: added string literal tests

test/schemas/string.prisma

@@ -0,0 +1,24 @@
+generator client {
+  provider = "prisma-client-js"
+  output   = "../target/string"
+}
+
+generator json {
+  provider = "node ./index.js"
+  namespace = "PStringJson"
+}
+
+datasource db {
+  provider = "postgresql"
+  url      = ""
+}
+
+model Model {
+  id Int @id @default(autoincrement())
+
+  untyped String
+  /// [WithType]
+  typed String
+  /// !['A' | 'B']
+  literal String
+}

test/schemas/unknown.prisma

@@ -16,4 +16,6 @@ model Model {
   id Int @id @default(autoincrement())
 
   field Json
+  str String
+  int Int
 }

test/types/string.test-d.ts

@@ -0,0 +1,22 @@
+import { expectNotType, expectType } from 'tsd';
+import { Model } from '../target/string/index';
+
+declare global {
+  export namespace PStringJson {
+    type WithType = 'C' | 'D';
+  }
+}
+
+expectType<Model>({
+  id: 0,
+  untyped: '' as string,
+  typed: 'C' as PStringJson.WithType,
+  literal: 'A' as 'A' | 'B'
+});
+
+expectNotType<Model>({
+  id: 0,
+  untyped: 'Mesquita' as string,
+  typed: 'D' as string,
+  literal: 'D' as string
+});

test/types/unknown.test-d.ts

@@ -3,10 +3,21 @@ import { Model } from '../target/unknown/index';
 
 expectType<Model>({
   id: 0,
-  field: {} as unknown
+  field: {} as unknown,
+  str: '' as string,
+  int: 0 as number,
 });
 
 expectNotType<Model>({
   id: 0,
-  field: {} as any
+  field: {} as any,
+  str: {} as unknown,
+  int: 0 as unknown,
+});
+
+expectNotType<Model>({
+  id: 0,
+  field: {} as any,
+  str: {} as any,
+  int: 0 as any
 });