147 lines
3.1 KiB
Go
147 lines
3.1 KiB
Go
package paginator
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import (
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"errors"
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"testing"
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"github.com/hashicorp/nomad/ci"
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"github.com/hashicorp/nomad/nomad/structs"
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"github.com/stretchr/testify/require"
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)
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func TestPaginator(t *testing.T) {
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ci.Parallel(t)
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ids := []string{"0", "1", "2", "3", "4", "5", "6", "7", "8", "9"}
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cases := []struct {
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name string
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perPage int32
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nextToken string
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expected []string
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expectedNextToken string
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expectedError string
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}{
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{
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name: "size-3 page-1",
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perPage: 3,
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expected: []string{"0", "1", "2"},
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expectedNextToken: "3",
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},
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{
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name: "size-5 page-2 stop before end",
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perPage: 5,
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nextToken: "3",
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expected: []string{"3", "4", "5", "6", "7"},
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expectedNextToken: "8",
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},
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{
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name: "page-2 reading off the end",
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perPage: 10,
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nextToken: "5",
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expected: []string{"5", "6", "7", "8", "9"},
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expectedNextToken: "",
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},
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{
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name: "starting off the end",
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perPage: 5,
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nextToken: "a",
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expected: []string{},
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expectedNextToken: "",
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},
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{
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name: "error during append",
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expectedError: "failed to append",
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},
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}
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for _, tc := range cases {
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t.Run(tc.name, func(t *testing.T) {
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iter := newTestIterator(ids)
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tokenizer := testTokenizer{}
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opts := structs.QueryOptions{
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PerPage: tc.perPage,
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NextToken: tc.nextToken,
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}
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results := []string{}
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paginator, err := NewPaginator(iter, tokenizer, nil, opts,
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func(raw interface{}) error {
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if tc.expectedError != "" {
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return errors.New(tc.expectedError)
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}
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result := raw.(*mockObject)
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results = append(results, result.id)
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return nil
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},
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)
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require.NoError(t, err)
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nextToken, err := paginator.Page()
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if tc.expectedError == "" {
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require.NoError(t, err)
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require.Equal(t, tc.expected, results)
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require.Equal(t, tc.expectedNextToken, nextToken)
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} else {
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require.Error(t, err)
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require.Contains(t, err.Error(), tc.expectedError)
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}
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})
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}
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}
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// helpers for pagination tests
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// implements Iterator interface
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type testResultIterator struct {
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results chan interface{}
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}
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func (i testResultIterator) Next() interface{} {
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select {
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case raw := <-i.results:
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if raw == nil {
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return nil
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}
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m := raw.(*mockObject)
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return m
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default:
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return nil
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}
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}
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type mockObject struct {
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id string
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namespace string
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}
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func (m *mockObject) GetNamespace() string {
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return m.namespace
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}
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func newTestIterator(ids []string) testResultIterator {
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iter := testResultIterator{results: make(chan interface{}, 20)}
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for _, id := range ids {
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iter.results <- &mockObject{id: id}
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}
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return iter
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}
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func newTestIteratorWithMocks(mocks []*mockObject) testResultIterator {
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iter := testResultIterator{results: make(chan interface{}, 20)}
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for _, m := range mocks {
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iter.results <- m
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}
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return iter
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}
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// implements Tokenizer interface
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type testTokenizer struct{}
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func (t testTokenizer) GetToken(raw interface{}) string {
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return raw.(*mockObject).id
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}
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