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utils.test.ts
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utils.test.ts
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import gql from 'graphql-tag';
import deepFreeze from 'deep-freeze';
import { stripExternalFieldsFromTypeDefs } from '../utils';
import { astSerializer } from 'apollo-federation-integration-testsuite';
expect.addSnapshotSerializer(astSerializer);
describe('Composition utility functions', () => {
describe('stripExternalFieldsFromTypeDefs', () => {
it('returns a new DocumentNode with @external fields removed as well as information about the removed fields', () => {
const typeDefs = gql`
type Query {
product: Product
}
extend type Product @key(fields: "sku") {
sku: String @external
}
type Mutation {
updateProduct: Product
}
extend interface Account @key(fields: "id") {
id: ID! @external
}
`;
const {
typeDefsWithoutExternalFields,
strippedFields,
} = stripExternalFieldsFromTypeDefs(typeDefs, 'serviceA');
expect(typeDefsWithoutExternalFields).toMatchInlineSnapshot(`
type Query {
product: Product
}
extend type Product @key(fields: "sku")
type Mutation {
updateProduct: Product
}
extend interface Account @key(fields: "id")
`);
expect(strippedFields).toMatchInlineSnapshot(`
Array [
Object {
"field": sku: String @external,
"parentTypeName": "Product",
"serviceName": "serviceA",
},
Object {
"field": id: ID! @external,
"parentTypeName": "Account",
"serviceName": "serviceA",
},
]
`);
});
it("doesn't mutate the input DocumentNode", () => {
const typeDefs = gql`
type Query {
product: Product
}
extend type Product @key(fields: "sku") {
sku: String @external
}
type Mutation {
updateProduct: Product
}
`;
deepFreeze(typeDefs);
// Assert that mutation does, in fact, throw
expect(() => (typeDefs.blah = [])).toThrow();
expect(() =>
stripExternalFieldsFromTypeDefs(typeDefs, 'serviceA'),
).not.toThrow();
});
});
});