Add test for interfaces

Author: Sov-trotter

test/runtests.jl

@@ -81,6 +81,9 @@ using LinearAlgebra
         p = Point(1.1, 2.2)
         @test p isa AbstractVector{Float64}
         pm = GeometryBasics.PointMeta(1.1, 2.2; a=1, b=2)
+        p1 = Point(2.2, 3.6)
+        p2 = [p, p1]
+        @test coordinates(p2) == p2
         @test meta(pm) === (a=1, b=2)
         @test metafree(pm) === p
         @test propertynames(pm) == (:position, :a, :b)