Update faas-cli version

**What**
- Update faas-cli dependency to 0.13.0, this is needed so
  that the logs request is parsed correctly

Signed-off-by: Lucas Roesler <[email protected]>

tests/logs_test.go

@@ -40,8 +40,13 @@ func Test_FunctionLogs(t *testing.T) {
 		copy(cnCases, cases)
 		for index := 0; index < len(cnCases); index++ {
 			ns := config.Namespaces[0]
+
+			newLogs := make([]string, len(cnCases[index].expectedLogs))
+			copy(newLogs, cnCases[index].expectedLogs)
+
+			newLogs[1] = fmt.Sprintf("Wrote %d Bytes", len(ns))
+			cnCases[index].expectedLogs = newLogs
 			cnCases[index].function.Namespace = ns
-			cnCases[index].expectedLogs[1] = fmt.Sprintf("Wrote %d Bytes", len(ns))
 		}
 
 		cases = append(cases, cnCases...)

tests/strings.go

@@ -0,0 +1,35 @@
+package tests
+
+import (
+	"math/rand"
+	"strings"
+	"time"
+)
+
+const letterBytes = "abcdefghijklmnopqrstuvwxyz"
+const (
+	letterIdxBits = 6                    // 6 bits to represent a letter index
+	letterIdxMask = 1<<letterIdxBits - 1 // All 1-bits, as many as letterIdxBits
+	letterIdxMax  = 63 / letterIdxBits   // # of letter indices fitting in 63 bits
+)
+
+var src = rand.NewSource(time.Now().UnixNano())
+
+func RandString(n int) string {
+	sb := strings.Builder{}
+	sb.Grow(n)
+	// A src.Int63() generates 63 random bits, enough for letterIdxMax characters!
+	for i, cache, remain := n-1, src.Int63(), letterIdxMax; i >= 0; {
+		if remain == 0 {
+			cache, remain = src.Int63(), letterIdxMax
+		}
+		if idx := int(cache & letterIdxMask); idx < len(letterBytes) {
+			sb.WriteByte(letterBytes[idx])
+			i--
+		}
+		cache >>= letterIdxBits
+		remain--
+	}
+
+	return sb.String()
+}