add tests for fswatcher

internal/fswatcher/fswatcher_test.go

@@ -2,14 +2,16 @@ package fswatcher
 
 import (
 	"errors"
+	"fmt"
 	"reflect"
+	"strings"
 	"testing"
 	"time"
 
 	"github.com/dominicbreuker/pspy/internal/fswatcher/inotify"
 )
 
-func TestInit(t *testing.T) {
+func initObjs() (*MockInotify, *MockWalker, *FSWatcher) {
 	i := NewMockInotify()
 	w := &MockWalker{
 		subdirs: map[string][]string{
@@ -22,7 +24,13 @@ func TestInit(t *testing.T) {
 		i:           i,
 		w:           w,
 		maxWatchers: 999,
+		eventSize:   11,
 	}
+	return i, w, fs
+}
+
+func TestInit(t *testing.T) {
+	i, _, fs := initObjs()
 	rdirs := []string{"mydir1"}
 	dirs := []string{"mydir2"}
 
@@ -45,6 +53,76 @@ loop:
 	}
 }
 
+func TestRun(t *testing.T) {
+	i, _, fs := initObjs()
+	triggerCh, eventCh, errCh := fs.Run()
+
+	// send data (len=11)
+	go func() {
+		sendInotifyData(t, i.bufReads, "name:type__")            // single event
+		sendInotifyData(t, i.bufReads, "error:read_")            // read error
+		sendInotifyData(t, i.bufReads, "error:parse")            // parse error
+		sendInotifyData(t, i.bufReads, "name1:type1name2:type2") // 2 events
+	}()
+
+	// parse first datum
+	expectTrigger(t, triggerCh)
+	expectEvent(t, eventCh, "type__ | name")
+
+	// parse second datum
+	expectTrigger(t, triggerCh)
+	expectError(t, errCh, "reading inotify buffer: error-inotify-read")
+
+	// parse third datum
+	expectTrigger(t, triggerCh)
+	expectError(t, errCh, "parsing events: parse-event-error")
+
+	// parse fourth datum
+	expectTrigger(t, triggerCh)
+	expectEvent(t, eventCh, "type1 | name1")
+	expectEvent(t, eventCh, "type2 | name2")
+}
+
+const timeout = 500 * time.Millisecond
+
+func sendInotifyData(t *testing.T, dataCh chan []byte, s string) {
+	select {
+	case dataCh <- []byte(s):
+	case <-time.After(timeout):
+		t.Fatalf("Could not send data in time: %s", s)
+	}
+}
+
+func expectTrigger(t *testing.T, triggerCh chan struct{}) {
+	select {
+	case <-triggerCh:
+	case <-time.After(timeout):
+		t.Fatalf("Timeout: did not receive trigger in time")
+	}
+}
+
+func expectEvent(t *testing.T, eventCh chan string, exp string) {
+	select {
+	case e := <-eventCh:
+		if strings.TrimSpace(e) != exp {
+			t.Errorf("Wrong event: %+v", e)
+		}
+	case <-time.After(timeout):
+		t.Fatalf("Timeout: did not receive event in time")
+	}
+}
+
+func expectError(t *testing.T, errCh chan error, exp string) {
+	select {
+	case err := <-errCh:
+		if err.Error() != exp {
+			t.Errorf("Wrong error: %v", err)
+		}
+	case <-time.After(timeout):
+		t.Fatalf("Timeout: did not receive error in time")
+	}
+}
+
 // mocks
 
 // Mock Inotify
@@ -52,12 +130,14 @@ loop:
 type MockInotify struct {
 	initialized bool
 	watching    []string
+	bufReads    chan []byte
 }
 
 func NewMockInotify() *MockInotify {
 	return &MockInotify{
 		initialized: false,
 		watching:    make([]string, 0),
+		bufReads:    make(chan []byte),
 	}
 }
 
@@ -79,11 +159,22 @@ func (i *MockInotify) NumWatchers() int {
 }
 
 func (i *MockInotify) Read(buf []byte) (int, error) {
-	return 32, nil
+	b := <-i.bufReads
+	t := strings.Split(string(b), ":")
+	if t[0] == "error" && t[1] == "read_" {
+		return -1, fmt.Errorf("error-inotify-read")
+	}
+	copy(buf, b)
+	return len(b), nil
 }
 
 func (i *MockInotify) ParseNextEvent(buf []byte) (*inotify.Event, uint32, error) {
-	return &inotify.Event{Name: "name", Op: "CREATE"}, 32, nil
+	s := string(buf[:11])
+	t := strings.Split(s, ":")
+	if t[0] == "error" && t[1] == "parse" {
+		return nil, uint32(len(buf)), fmt.Errorf("parse-event-error")
+	}
+	return &inotify.Event{Name: t[0], Op: t[1]}, 11, nil
 }
 
 func (i *MockInotify) Close() error {