add a test case for empty schema

Author: mizdra

src/__snapshots__/code-generator.test.ts.snap

@@ -51,3 +51,18 @@ export type OptionalNode = OptionalBook | OptionalAuthor;
 
 "
 `;
+
+exports[`generateCode > generates code when empty typeInfos is passed 1`] = `
+"import {
+  type DefineTypeFactoryInterface,
+  defineTypeFactory,
+} from '@mizdra/graphql-codegen-typescript-fabbrica/helper';
+import type {
+  Maybe,
+,
+} from './types';
+
+export * from '@mizdra/graphql-codegen-typescript-fabbrica/helper';
+
+"
+`;

src/code-generator.test.ts

@@ -73,4 +73,13 @@ describe('generateCode', () => {
     const actual = generateCode(config, typeInfos);
     expect(actual).toMatchSnapshot();
   });
+  it('generates code when empty typeInfos is passed', () => {
+    const config = fakeConfig({
+      typesFile: './types',
+      skipTypename: oneOf([true, false]),
+    });
+    const typeInfos: TypeInfo[] = [];
+    const actual = generateCode(config, typeInfos);
+    expect(actual).toMatchSnapshot();
+  });
 });

src/schema-scanner.test.ts

@@ -77,6 +77,13 @@ describe('getTypeInfos', () => {
       ]
     `);
   });
+  it('returns empty array when schema without type is passed', () => {
+    const schema = buildSchema(`
+    scalar Date
+    `);
+    const config: Config = fakeConfig();
+    expect(getTypeInfos(config, schema)).toMatchInlineSnapshot(`[]`);
+  });
   it('includes description comment', () => {
     const schema = buildSchema(`
       "The book"