Grand test fixup (#138)

* start fixing up tests

* fix up tests + automate with drone

* fiddle with linting

* messing about with drone.yml

* some more fiddling

* hmmm

* add cache

* add vendor directory

* verbose

* ci updates

* update some little things

* update sig

vendor/github.com/leodido/go-urn/urn.go

@@ -0,0 +1,86 @@
+package urn
+
+import (
+	"encoding/json"
+	"fmt"
+	"strings"
+)
+
+const errInvalidURN = "invalid URN: %s"
+
+// URN represents an Uniform Resource Name.
+//
+// The general form represented is:
+//
+//	urn:<id>:<ss>
+//
+// Details at https://tools.ietf.org/html/rfc2141.
+type URN struct {
+	prefix string // Static prefix. Equal to "urn" when empty.
+	ID     string // Namespace identifier
+	SS     string // Namespace specific string
+	norm   string // Normalized namespace specific string
+}
+
+// Normalize turns the receiving URN into its norm version.
+//
+// Which means: lowercase prefix, lowercase namespace identifier, and immutate namespace specific string chars (except <hex> tokens which are lowercased).
+func (u *URN) Normalize() *URN {
+	return &URN{
+		prefix: "urn",
+		ID:     strings.ToLower(u.ID),
+		SS:     u.norm,
+	}
+}
+
+// Equal checks the lexical equivalence of the current URN with another one.
+func (u *URN) Equal(x *URN) bool {
+	return *u.Normalize() == *x.Normalize()
+}
+
+// String reassembles the URN into a valid URN string.
+//
+// This requires both ID and SS fields to be non-empty.
+// Otherwise it returns an empty string.
+//
+// Default URN prefix is "urn".
+func (u *URN) String() string {
+	var res string
+	if u.ID != "" && u.SS != "" {
+		if u.prefix == "" {
+			res += "urn"
+		}
+		res += u.prefix + ":" + u.ID + ":" + u.SS
+	}
+
+	return res
+}
+
+// Parse is responsible to create an URN instance from a byte array matching the correct URN syntax.
+func Parse(u []byte) (*URN, bool) {
+	urn, err := NewMachine().Parse(u)
+	if err != nil {
+		return nil, false
+	}
+
+	return urn, true
+}
+
+// MarshalJSON marshals the URN to JSON string form (e.g. `"urn:oid:1.2.3.4"`).
+func (u URN) MarshalJSON() ([]byte, error) {
+	return json.Marshal(u.String())
+}
+
+// MarshalJSON unmarshals a URN from JSON string form (e.g. `"urn:oid:1.2.3.4"`).
+func (u *URN) UnmarshalJSON(bytes []byte) error {
+	var str string
+	if err := json.Unmarshal(bytes, &str); err != nil {
+		return err
+	}
+	if value, ok := Parse([]byte(str)); !ok {
+		return fmt.Errorf(errInvalidURN, str)
+	} else {
+		*u = *value
+	}
+	return nil
+}