move imports into if-condition in tests

Author: ytdHuang

test/core-test/code_quality.jl

@@ -1,5 +1,3 @@
-using Aqua, JET
-
 @testset "Code quality" verbose = true begin
     @testset "Aqua.jl" begin
         Aqua.test_all(QuantumToolbox; ambiguities = false, unbound_args = false)

test/ext-test/gpu/cuda_ext.jl

@@ -1,10 +1,3 @@
-using CUDA
-using CUDA.CUSPARSE
-CUDA.allowscalar(false) # Avoid unexpected scalar indexing
-
-QuantumToolbox.about()
-CUDA.versioninfo()
-
 @testset "CUDA Extension" verbose = true begin
     ψdi = Qobj(Int64[1, 0])
     ψdf = Qobj(Float64[1, 0])

test/runtests.jl

@@ -1,9 +1,5 @@
 using Test
 using Pkg
-using QuantumToolbox
-using QuantumToolbox: position, momentum
-using Random
-using SciMLOperators
 
 const GROUP = get(ENV, "GROUP", "All")
 
@@ -31,10 +27,18 @@ core_tests = [
 ]
 
 if (GROUP == "All") || (GROUP == "Code-Quality")
+    using QuantumToolbox
+    using Aqua, JET
+
     include(joinpath(testdir, "core-test", "code_quality.jl"))
 end
 
 if (GROUP == "All") || (GROUP == "Core")
+    using QuantumToolbox
+    import QuantumToolbox: position, momentum
+    import Random
+    import SciMLOperators: MatrixOperator
+
     QuantumToolbox.about()
 
     for test in core_tests
@@ -46,5 +50,14 @@ if (GROUP == "CUDA_Ext")# || (GROUP == "All")
     Pkg.activate("ext-test/gpu")
     Pkg.develop(PackageSpec(path = dirname(@__DIR__)))
     Pkg.instantiate()
+
+    using QuantumToolbox
+    using CUDA
+    using CUDA.CUSPARSE
+    CUDA.allowscalar(false) # Avoid unexpected scalar indexing
+
+    QuantumToolbox.about()
+    CUDA.versioninfo()
+
     include(joinpath(testdir, "ext-test", "gpu", "cuda_ext.jl"))
 end