Update ode_event_tests.jl

test/integrators/ode_event_tests.jl

@@ -411,21 +411,23 @@ step!(integrator, 1e-5, true)
 @test all(u -> u > 1.5, integrator.u)
 
 # https://github.com/SciML/OrdinaryDiffEq.jl/pull/1777
-@testset "Callbacks with LinearExponential" begin
-    A = sprand(ComplexF64, 100, 100, 0.5)
-    A += A'
-
-    t_l = LinRange(0, 1, 100)
-
-    saved_values = SavedValues(Float64, Float64)
-    function save_func(u, t, integrator)
-        real(u' * A * u)
+if VERSION >= v"1.7"
+    @testset "Callbacks with LinearExponential" begin
+        A = sprand(ComplexF64, 100, 100, 0.5)
+        A += A'
+
+        t_l = LinRange(0, 1, 100)
+
+        saved_values = SavedValues(Float64, Float64)
+        function save_func(u, t, integrator)
+            real(u' * A * u)
+        end
+        cb = SavingCallback(save_func, saved_values, saveat = t_l)
+
+        u0 = normalize(rand(ComplexF64, 100))
+        A = MatrixOperator(-1im * A)
+        prob = ODEProblem(A, u0, (0, 1.0))
+        solve(prob, LinearExponential(), dt = t_l[2] - t_l[1], callback = cb)
+        @test length(saved_values.saveval) == length(t_l)
     end
-    cb = SavingCallback(save_func, saved_values, saveat = t_l)
-
-    u0 = normalize(rand(ComplexF64, 100))
-    A = MatrixOperator(-1im * A)
-    prob = ODEProblem(A, u0, (0, 1.0))
-    solve(prob, LinearExponential(), dt = t_l[2] - t_l[1], callback = cb)
-    @test length(saved_values.saveval) == length(t_l)
 end