test: watch use case test

use_case/watch_test.go

@@ -0,0 +1,90 @@
+package use_case_test
+
+import (
+	"testing"
+
+	"github.com/lucaschain/beholder/core"
+	"github.com/lucaschain/beholder/core/event_types"
+	"github.com/lucaschain/beholder/use_case"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestWatch(t *testing.T) {
+	t.Run("should only call callback if type is allowed", func(t *testing.T) {
+		config := buildWatchConfig()
+		config.AllowedTypes = []string{string(event_types.Create)}
+
+		var called bool
+		fakeRunner := func(command []string) error {
+			called = true
+			return nil
+		}
+		fakeWatcher := buildFakeFileWatcher("test.txt", event_types.Create)
+
+		use_case.Watch(config, fakeWatcher, fakeRunner)
+
+		assert.True(t, called)
+	})
+
+	t.Run("should not call callback if type is not allowed", func(t *testing.T) {
+		config := buildWatchConfig()
+		config.AllowedTypes = []string{string(event_types.Chmod)}
+
+		var called bool
+		fakeRunner := func(command []string) error {
+			called = true
+			return nil
+		}
+		fakeWatcher := buildFakeFileWatcher("test.txt", event_types.Create)
+
+		use_case.Watch(config, fakeWatcher, fakeRunner)
+
+		assert.False(t, called)
+	})
+
+	t.Run("should replace the command tokens based on the event", func(t *testing.T) {
+		config := buildWatchConfig()
+		config.AllowedTypes = []string{string(event_types.Create)}
+		config.Command = []string{"echo", "{type}", "{file}"}
+
+		var command []string
+		fakeRunner := func(cmd []string) error {
+			command = cmd
+			return nil
+		}
+		fakeWatcher := buildFakeFileWatcher("test.txt", event_types.Create)
+
+		use_case.Watch(config, fakeWatcher, fakeRunner)
+
+		assert.Equal(t, []string{"echo", "CREATE", "test.txt"}, command)
+	})
+}
+
+func buildFakeFileWatcher(filename string, eventType event_types.EventType) use_case.FileWatcher {
+	if filename == "" {
+		filename = "test.txt"
+	}
+
+	event := &core.ChangeEvent{
+		Type:     event_types.Create,
+		FileName: filename,
+	}
+	return func(paths []string, callback core.ChangeCallback) {
+		callback(event, nil)
+	}
+}
+
+func buildFakeRunner() use_case.CommandRunner {
+	return func(command []string) error {
+		return nil
+	}
+}
+
+func buildWatchConfig() use_case.WatchConfig {
+	return use_case.WatchConfig{
+		Paths:        []string{"."},
+		Command:      []string{"echo", "hello"},
+		AllowedTypes: []string{event_types.Create.String()},
+		AllowFailing: false,
+	}
+}