(eq b (target-vertex edge)))
target-edges) :report "targets")))
+(addtest (test-api
+ :documentation "case 218")
+ parents-of-child-vertexes
+ (let* ((g (build-single-diamond-graph :directed))
+ (b (find-vertex g 'b))
+ (child-vertexes (child-vertexes b)))
+ (ensure (every (lambda (vertex)
+ (member b (parent-vertexes vertex)))
+ child-vertexes) :report "children")))
+
+(addtest (test-api
+ :documentation "case 218")
+ children-of-parent-vertexes
+ (let* ((g (build-single-diamond-graph :directed))
+ (b (find-vertex g 'b))
+ (parent-vertexes (parent-vertexes b)))
+ (ensure (every (lambda (vertex)
+ (member b (child-vertexes vertex)))
+ parent-vertexes) :report "parents")))
+
+(addtest (test-api
+ :documentation "case 218")
+ parents-and-children=are-correct
+ (let* ((g (build-single-diamond-graph :directed))
+ (b (find-vertex g 'b))
+ (child-vertexes (child-vertexes b))
+ (parent-vertexes (parent-vertexes b)))
+ (ensure-same child-vertexes (list (find-vertex g 'c)
+ (find-vertex g 'i))
+ :test 'set-equal))
+ (ensure-same parent-vertexes (list (find-vertex g 'a))
+ :test 'set-equal))