diff --git a/test/test_namedgraph.jl b/test/test_namedgraph.jl
index 48bc3d2..08d9fa2 100644
--- a/test/test_namedgraph.jl
+++ b/test/test_namedgraph.jl
@@ -676,9 +676,7 @@ end
     es = [(1, 2) => (1, 3), (1, 3) => (1, 4), (1, 4) => (2, 4), (2, 4) => (3, 4)]
     @test ne(st) == 4
     @test nv(st) == 5
-    # Test that there are no degree-zero vertices in output:
-    zero_deg_verts = filter(v -> degree(st, v) == 0, vertices(st))
-    @test isempty(zero_deg_verts)
+    @test !any(v -> degree(st, v) == 0, vertices(st))
     for e in es
       @test has_edge(st, e)
     end