/events/store_test.go

package events

import (
	"testing"

	"github.com/google/uuid"
	"github.com/stretchr/testify/assert"
)

func TestStore(t *testing.T) {
	store := NewStore()

	testData := []Event{
		{ID: uuid.New().String(), Topic: "foo"},
		{ID: uuid.New().String(), Topic: "foo"},
		{ID: uuid.New().String(), Topic: "bar"},
	}

	// write the records to the store
	t.Run("Write", func(t *testing.T) {
		for _, event := range testData {
			err := store.Write(&event)
			assert.Nilf(t, err, "Writing an event should not return an error")
		}
	})

	// should not be able to read events from a blank topic
	t.Run("ReadMissingTopic", func(t *testing.T) {
		evs, err := store.Read("")
		assert.Equal(t, err, ErrMissingTopic, "Reading a blank topic should return an error")
		assert.Nil(t, evs, "No events should be returned")
	})

	// should only get the events from the topic requested
	t.Run("ReadTopic", func(t *testing.T) {
		evs, err := store.Read("foo")
		assert.Nilf(t, err, "No error should be returned")
		assert.Len(t, evs, 2, "Only the events for this topic should be returned")
	})

	// limits should be honored
	t.Run("ReadTopicLimit", func(t *testing.T) {
		evs, err := store.Read("foo", ReadLimit(1))
		assert.Nilf(t, err, "No error should be returned")
		assert.Len(t, evs, 1, "The result should include no more than the read limit")
	})
}