TEST: added assert for map! creation

Author: Oldes

src/tests/units/map-test.r3

@@ -11,7 +11,7 @@ Rebol [
 ===start-group=== "map issues"
 	;@@ https://github.com/rebol/rebol-issues/issues/770
 	--test-- "map-issue-770"
-		m: make map! [a: 1]
+		--assert  map? m: make map! [a: 1]
 		--assert  1 = m/a
 		--assert  not empty? m
 		--assert  empty? clear m