Fix zero tests on Julia master (#609)

Broken tests were fixed by JuliaLang/julia#48221

Author: sostock

test/runtests.jl

@@ -1429,17 +1429,24 @@ end
             @test zero(Quantity[1m, 1s]) == [0m, 0s]
             @test zero([1mm, missing]) == [0mm, 0mm]
             @test zero(Union{typeof(0.0s),Missing}[missing]) == [0.0s]
-            @test_broken zero(Union{Quantity{Int,𝐋},Missing}[1mm, missing]) == [0mm, 0m]
-            @test_broken zero(Union{Quantity{Float64,𝐋},Missing}[1.0mm, missing]) == [0.0mm, 0.0m]
+            if VERSION ≥ v"1.10.0-DEV.425"
+                @test zero(Union{Quantity{Int,𝐋},Missing}[1mm, missing]) == [0m, 0m]
+                @test zero(Union{Quantity{Float64,𝐋},Missing}[1.0mm, missing]) == [0.0m, 0.0m]
+                @test zero(Union{Quantity{Int,𝚯},Missing}[1°C, 2°F, missing]) == [0K, 0K, 0K]
+                @test zero(Vector{Union{Quantity{Float64,𝐋},Missing}}(undef, 1)) == [0.0m]
+            else
+                @test_broken zero(Union{Quantity{Int,𝐋},Missing}[1mm, missing]) == [0m, 0m]
+                @test_broken zero(Union{Quantity{Float64,𝐋},Missing}[1.0mm, missing]) == [0.0m, 0.0m]
+                @test_broken zero(Union{Quantity{Int,𝚯},Missing}[1°C, 2°F, missing]) == [0K, 0K, 0K]
+                @test_broken zero(Vector{Union{Quantity{Float64,𝐋},Missing}}(undef, 1)) == [0.0m]
+            end
             @test_broken zero(Union{Quantity,Missing}[1m, 1mm]) == [0m, 0mm]
             @test zero([1°C, 2°C]) == [0K, 0K]
             @test zero(Quantity[1°C, 2°F]) == [0K, 0K]
             @test zero(Union{typeof(0°C),Missing}[missing]) == [0K]
-            @test_broken zero(Union{Quantity{Int,𝚯},Missing}[1°C, 2°F, missing]) == [0K, 0K, 0K]
             @test zero(Vector{typeof(big(1)mm)}(undef, 1)) == [big(0)mm]
             @test zero(Vector{Union{typeof(big(1)mm),Missing}}(undef, 1)) == [big(0)mm]
             @test zero(Vector{Quantity{Float64,𝐋}}(undef, 1)) == [0.0m]
-            @test_broken zero(Vector{Union{Quantity{Float64,𝐋},Missing}}(undef, 1)) == [0.0m]
             @test_throws MethodError zero(Union{Quantity,Missing}[1m, 1s, missing])
             @test_throws MethodError zero(Vector{Quantity}(undef, 1))
             @test_throws MethodError zero(Vector{Union{Quantity,Missing}}(undef, 1))