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// @flow
import { request } from '../../utils';
import data from 'shared/testing/data';
import { toPlainText, toState } from 'shared/draft-utils';
const messageToPlainText = message =>
toPlainText(toState(JSON.parse(message.content.body)));
// Get all messages in our test thread and sort them by time
const messages = data.messages
.filter(({ threadId }) => threadId === 'thread-1')
.sort((a, b) => a.timestamp - b.timestamp);
describe('reverse pagination', () => {
it('should fetch with reverse pagination', async () => {
// Get the first three messages
const query = /* GraphQL */ `
{
thread(id: "thread-1") {
messageConnection(first: 3) {
pageInfo {
hasNextPage
hasPreviousPage
}
edges {
cursor
node {
content {
body
}
}
}
}
}
}
`;
expect.hasAssertions();
const result = await request(query);
// Get the cursor of the first message
const { edges, pageInfo } = result.data.thread.messageConnection;
expect(edges).toHaveLength(3);
// Make sure pageInfo is calculated correctly
expect(pageInfo).toEqual({
hasNextPage: messages.length > 3,
// We know this can't have a previous page since we fetched the very first one
hasPreviousPage: false,
});
// Make sure we got the right messages
edges.forEach(({ node }, index) => {
expect(messageToPlainText(node)).toEqual(
messageToPlainText(messages[index])
);
});
// Return the cursor of the last message
const cursor = edges[2].cursor;
// Get one message before the last message of the first page we just got
const nextQuery = /* GraphQL */ `
{
thread(id: "thread-1") {
messageConnection(last: 1, before: "${cursor}") {
pageInfo {
hasNextPage
hasPreviousPage
}
edges {
node {
content {
body
}
}
}
}
}
}
`;
const nextResult = await request(nextQuery);
expect(nextResult.data.thread.messageConnection.pageInfo).toEqual({
// We know there's more messages on either side of this one
hasNextPage: true,
hasPreviousPage: true,
});
expect(
messageToPlainText(nextResult.data.thread.messageConnection.edges[0].node)
).toEqual(messageToPlainText(messages[1]));
});
it('should correctly set pageInfo when more messages are requested than are available', async () => {
// Request more messages than there are
const query = /* GraphQL */ `
{
thread(id: "thread-1") {
messageConnection(last: ${messages.length + 1}) {
pageInfo {
hasNextPage
hasPreviousPage
}
edges {
cursor
}
}
}
}
`;
expect.hasAssertions();
const result = await request(query);
const { edges, pageInfo } = result.data.thread.messageConnection;
expect(edges).toHaveLength(messages.length);
expect(pageInfo).toEqual({
hasNextPage: false,
hasPreviousPage: false,
});
});
it('should correctly set pageInfo when all messages are requested', async () => {
// Request more messages than there are
const query = /* GraphQL */ `
{
thread(id: "thread-1") {
messageConnection(last: ${messages.length}) {
pageInfo {
hasNextPage
hasPreviousPage
}
edges {
cursor
}
}
}
}
`;
expect.hasAssertions();
const result = await request(query);
const { edges, pageInfo } = result.data.thread.messageConnection;
expect(edges).toHaveLength(messages.length);
expect(pageInfo).toEqual({
hasNextPage: false,
hasPreviousPage: false,
});
});
it('should correctly set pageInfo when more messages are requested than are available after a cursor', async () => {
// Get the cursor of the last message
const query = /* GraphQL */ `
{
thread(id: "thread-1") {
messageConnection(last: 1) {
edges {
cursor
}
}
}
}
`;
expect.hasAssertions();
const result = await request(query);
const cursor = result.data.thread.messageConnection.edges[0].cursor;
// Get all messages after the cursor of the last message
// but get more than are available
const nextQuery = /* GraphQL */ `
{
thread(id: "thread-1") {
messageConnection(last: ${messages.length}, before: "${cursor}") {
pageInfo {
hasNextPage
hasPreviousPage
}
edges {
cursor
}
}
}
}
`;
const nextResult = await request(nextQuery);
expect(nextResult.data.thread.messageConnection.edges).toHaveLength(
messages.length - 1
);
expect(nextResult.data.thread.messageConnection.pageInfo).toEqual({
hasNextPage: true,
hasPreviousPage: false,
});
});
});
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