diff --git a/utils/blockers_test.go b/utils/blockers_test.go
index fa70257d8..523401f44 100644
--- a/utils/blockers_test.go
+++ b/utils/blockers_test.go
@@ -113,3 +113,24 @@ func TestBlockersClone(t *testing.T) {
 
 	}
 }
+
+func TestBlockersString(t *testing.T) {
+	blkrs := DynamicBlockers{}
+
+	exp := ""
+
+	if rcv := blkrs.String("", ""); !reflect.DeepEqual(rcv, exp) {
+		t.Errorf("Expected %v \n received %v, length of blksr is %v", ToJSON(exp), ToJSON(rcv), len(blkrs))
+
+	}
+	blkrsTrue := DynamicBlocker{
+
+		Blocker: true,
+	}
+	expTrue := "true"
+	if rcvTrue := blkrsTrue.String("", ""); !reflect.DeepEqual(rcvTrue, expTrue) {
+		t.Errorf("Expected %v \n received %v", ToJSON(expTrue), ToJSON(rcvTrue))
+
+	}
+
+}
diff --git a/utils/coreutils_test.go b/utils/coreutils_test.go
index 10e71b62d..21228d9a2 100644
--- a/utils/coreutils_test.go
+++ b/utils/coreutils_test.go
@@ -542,6 +542,11 @@ func TestParseTimeDetectLayout(t *testing.T) {
 	if err != nil || !date.UTC().Equal(expected.UTC()) {
 		t.Errorf("Expecting: %v, received: %v", expected.UTC(), date.UTC())
 	}
+	if date, err := ParseTimeDetectLayout("2014-11-25T00:00:00+01:00", "65"); err == nil {
+		t.Error("Expecting error 'timezone: invalid timezone', received: nil")
+	} else if date != nilTime {
+		t.Errorf("Expecting nilTime, received: %+v", date)
+	}
 
 }
 
@@ -1475,6 +1480,9 @@ func TestFibDuration(t *testing.T) {
 	if tmp := FibDuration(2*time.Second, 0); tmp() != 2*time.Second {
 		t.Error("Expecting: 2, received ", tmp())
 	}
+	if tmp := FibDuration(2*time.Second, 4); tmp() != 4*time.Nanosecond {
+		t.Error("Expecting: 4, received ", tmp())
+	}
 }
 
 func TestCoreUtilsPaginate(t *testing.T) {
@@ -1686,3 +1694,46 @@ func TestCoreUtilsFibDurationSeqNrOverflow(t *testing.T) {
 		}
 	}
 }
+
+func TestUnzip(t *testing.T) {
+
+	if rcv := Unzip("Test error for unzip", "Test dest"); rcv == nil {
+		t.Error(rcv)
+	}
+
+}
+
+func TestToUnescapedJSON(t *testing.T) {
+	type testStruc struct {
+		testInt int
+	}
+
+	a := func(a int, b int) int {
+		return a + b
+	}
+
+	r := testStruc{testInt: 999}
+
+	if rcv, err := ToUnescapedJSON(a); err == nil {
+		t.Error(err)
+		t.Errorf("Expected nil, received %v", rcv)
+	}
+	exp := []byte{123, 125, 10}
+	if rcv, err := ToUnescapedJSON(r); err != nil {
+		t.Error(err)
+		t.Errorf("Expected %v, received %v", ToJSON(exp), ToJSON(rcv))
+	}
+}
+
+func TestCloneOfObject(t *testing.T) {
+
+	pgnt := Paginator{
+		MaxItems: IntPointer(7),
+	}
+	exp := Paginator{
+		MaxItems: IntPointer(7),
+	}
+	if rcv := pgnt.Clone(); !reflect.DeepEqual(exp, rcv) {
+		t.Errorf("Expected %v, received %v", ToJSON(exp), ToJSON(rcv))
+	}
+}
diff --git a/utils/decimal_test.go b/utils/decimal_test.go
index 9bf1f3e8d..1a6d4ff6f 100644
--- a/utils/decimal_test.go
+++ b/utils/decimal_test.go
@@ -444,3 +444,27 @@ func TestMarshalUnmarshalNA(t *testing.T) {
 		t.Errorf("%v and %v are different", dec2, DecimalNaN)
 	}
 }
+
+func TestNewRoundingMode(t *testing.T) {
+	var tests = []struct {
+		rnd string
+		exp decimal.RoundingMode
+	}{
+		{"*toNearestEven", 0},
+		{"*toNearestAway", 1},
+		{"*toZero", 2},
+		{"*awayFromZero", 3},
+		{"*toNegativeInf", 4},
+		{"*toPositiveInf", 5},
+		{"*toNearestTowardZero", 6},
+	}
+
+	for _, e := range tests {
+		if rcv, err := NewRoundingMode(e.rnd); err != nil {
+			t.Error(err)
+		} else if !reflect.DeepEqual(rcv, e.exp) {
+			t.Errorf("expected: <%v>, received: <%v>", e.exp, rcv)
+		}
+
+	}
+}
diff --git a/utils/dynamicweight_test.go b/utils/dynamicweight_test.go
index c04f53934..939f3ffe4 100644
--- a/utils/dynamicweight_test.go
+++ b/utils/dynamicweight_test.go
@@ -90,6 +90,27 @@ func TestNewDynamicWeightsFromString(t *testing.T) {
 	if _, err := NewDynamicWeightsFromString(dwsStr, ";", "&"); err == nil || err.Error() != expected {
 		t.Errorf("expecting: %+v, received: %+v", expected, err)
 	}
+
+	exp := DynamicWeights{{}}
+	if rcv, err := NewDynamicWeightsFromString("", "", ""); err != nil {
+		t.Error(err)
+	} else if !reflect.DeepEqual(exp, rcv) {
+		t.Errorf("Expected %v, Received %v", ToJSON(exp), ToJSON(rcv))
+	}
+
+	exps := DynamicWeights{
+		{
+			FilterIDs: nil,
+			Weight:    5,
+		},
+	}
+	if rcv, err := NewDynamicWeightsFromString(";5", ";", "&"); err != nil {
+		t.Error(err)
+	} else if !reflect.DeepEqual(exps, rcv) {
+		t.Errorf("expecting: %+v, received: %+v", ToJSON(exps), ToJSON(rcv))
+	} else if _, err := NewDynamicWeightsFromString(";5;", ";", "&"); err == nil {
+		t.Error(err)
+	}
 }
 
 func TestDynamicWeightString(t *testing.T) {