Add integration tests for entries

model/entry.go

@@ -68,6 +68,19 @@ func ValidateDirection(direction string) error {
 	return fmt.Errorf(`Invalid direction, valid direction values are: "asc" or "desc"`)
 }
 
+// ValidateRange makes sure the offset/limit values are valid.
+func ValidateRange(offset, limit int) error {
+	if offset < 0 {
+		return fmt.Errorf(`Offset value should be >= 0`)
+	}
+
+	if limit < 0 {
+		return fmt.Errorf(`Limit value should be >= 0`)
+	}
+
+	return nil
+}
+
 // GetOppositeDirection returns the opposite sorting direction.
 func GetOppositeDirection(direction string) string {
 	if direction == "asc" {

model/entry_test.go

@@ -42,6 +42,20 @@ func TestValidateEntryDirection(t *testing.T) {
 	}
 }
 
+func TestValidateRange(t *testing.T) {
+	if err := ValidateRange(-1, 0); err == nil {
+		t.Error(`An invalid offset should generate a error`)
+	}
+
+	if err := ValidateRange(0, -1); err == nil {
+		t.Error(`An invalid limit should generate a error`)
+	}
+
+	if err := ValidateRange(42, 42); err != nil {
+		t.Error(`A valid offset and limit should not generate any error`)
+	}
+}
+
 func TestGetOppositeDirection(t *testing.T) {
 	if GetOppositeDirection("asc") != "desc" {
 		t.Errorf(`The opposite direction of "asc" should be "desc"`)