Fix Did.from(URI) fragment rejection

Author: filip26

src/main/java/com/apicatalog/did/Did.java

@@ -86,6 +86,10 @@ public static Did from(final URI uri) {
         if (!Did.SCHEME.equalsIgnoreCase(uri.getScheme())) {
             throw new IllegalArgumentException("The URI [" + uri + "] is not valid DID, must start with 'did:' prefix.");
         }
+        
+        if (uri.getFragment() != null) {
+            throw new IllegalArgumentException("The URI [" + uri + "] is not valid DID, must be in form 'did:method:method-specific-id'.");
+        }
 
         final String[] parts = uri.getSchemeSpecificPart().split(":", 2);
 

src/test/java/com/apicatalog/did/DidTest.java

@@ -59,13 +59,10 @@ void fromUri(String input, String method, String specificId) {
     @ParameterizedTest()
     @MethodSource({ "negativeVectors" })
     void fromUriNegative(String uri) {
-
-        final URI tmp = URI.create(uri);
-
         try {
-            Did.from(tmp);
+            Did.from(URI.create(uri));
             fail();
-        } catch (IllegalArgumentException e) {
+        } catch (IllegalArgumentException | NullPointerException e) {
             /* expected */ }
     }