add test for mergeVariableStates!

Author: Affie

test/testBlocks.jl

@@ -795,7 +795,8 @@ function VSDTestBlock!(fg, v1)
     @test mergeVariableState!(fg, :a, vnd) == 1
 
     # Bulk copy update x0
-    @test DFG.mergeVariableStates!(fg, Vector{Pair{Symbol, VariableState}}([:a=>vnd])) == 1
+    @test DFG.mergeVariableStates!(fg, [:a=>vnd]) == 1
+    @test DFG.mergeVariableStates!(fg, :a, [vnd]) == 1
     altVnd = vnd |> deepcopy
     keepVnd = getVariableState(getVariable(fg, :a), :parametric) |> deepcopy
     altVnd.infoPerCoord .= [-99.0;]