test(graphql-default-value-transformer): @default cannot be used on composite key members

Author: p5quared

packages/amplify-graphql-default-value-transformer/src/__tests__/amplify-grapphql-default-value-transformer.test.ts

@@ -249,6 +249,22 @@ describe('DefaultValueModelTransformer:', () => {
     ).toThrow('The @default directive may not be applied to primaryKey fields.');
   });
 
+  it('throws if @default is used on a composite key member', () => {
+    const schema = `
+    type Project @model {
+      projectId: ID! @primaryKey(sortKeyFields: ["name"])
+      name: String! @default(value: "Mustapha Mond")
+    }
+    `;
+
+    expect(() =>
+      testTransform({
+        schema,
+        transformers: [new ModelTransformer(), new DefaultValueTransformer(), new PrimaryKeyTransformer()],
+      }),
+    ).toThrow('The @default directive may not be applied to composite key member fields.');
+  });
+
   it('should validate enum values', async () => {
     const inputSchema = `
       type Post @model {