Added 100% coverage test for cancelableReader

Author: cmaglie

cancelable_reader_test.go

@@ -0,0 +1,63 @@
+package extract
+
+import (
+	"bytes"
+	"context"
+	"fmt"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestCancelableReader(t *testing.T) {
+	var b [100000]byte
+	ctx, cancel := context.WithCancel(context.Background())
+	reader := newCancelableReader(ctx, bytes.NewReader(b[:]))
+	defer cancel()
+
+	var buff [1000]byte
+	readed := 0
+	for {
+		n, err := reader.Read(buff[:])
+		if err != nil {
+			fmt.Println("exit error:", err)
+			require.Equal(t, "EOF", err.Error())
+			break
+		}
+		require.NotZero(t, n)
+		time.Sleep(10 * time.Millisecond)
+		readed += n
+	}
+
+	fmt.Println("Readed", readed, "out of", len(b))
+	require.Equal(t, len(b), readed)
+}
+
+func TestCancelableReaderWithInterruption(t *testing.T) {
+	var b [100000]byte
+	ctx, cancel := context.WithCancel(context.Background())
+	reader := newCancelableReader(ctx, bytes.NewReader(b[:]))
+	defer cancel()
+
+	go func() {
+		time.Sleep(100 * time.Millisecond)
+		cancel()
+	}()
+
+	var buff [1000]byte
+	readed := 0
+	for {
+		n, err := reader.Read(buff[:])
+		if err != nil {
+			fmt.Println("exit error:", err)
+			require.Equal(t, "interrupted", err.Error())
+			break
+		}
+		require.NotZero(t, n)
+		time.Sleep(10 * time.Millisecond)
+		readed += n
+	}
+	fmt.Println("Readed", readed, "out of", len(b))
+	require.True(t, readed < len(b))
+}