Add test for just first name in input data.

src/test/kotlin/TestFacetBuilders.kt

@@ -82,7 +82,7 @@ class TestFacetBuilders {
             json {
                 obj(
                     Pair("@type", NS.rico + "Person"),
-                    Pair(KEYS.name, "Albert Einstein"),
+                    Pair(KEYS.name, "Einstein"),
                     Pair(KEYS.lastName, "Einstein"),
                     Pair(KEYS.agentIsTargetOfCreationRelation, "identifier")
                 )
@@ -94,6 +94,23 @@ class TestFacetBuilders {
                 "0~E~",
                 "1~E~Einstein~"
             )
+        ),
+        PersonFacetBuilderParams(
+            json {
+                obj(
+                    Pair("@type", NS.rico + "Person"),
+                    Pair(KEYS.name, "Albert"),
+                    Pair(KEYS.firstName, "Albert"),
+                    Pair(KEYS.agentIsTargetOfCreationRelation, "identifier")
+                )
+            },
+            mapOf(Pair("identifier", json { obj(Pair(KEYS.ricoType, KEYS.contributor)) })),
+            KEYS.contributor,
+            "",
+            listOf(
+                "0~A~",
+                "1~A~Albert~"
+            )
         )
     )