Fix nightly tests (#50)

* Use Pkg.develop instead of LOAD_PATH

* Expand CI test matrix to include 1.5, 1.7

1.5 is the lowest version we support here.

(cherry picked from commit ad3c9a9)

Author: mortenpi

.github/workflows/ci.yml

@@ -13,6 +13,8 @@ jobs:
     strategy:
       matrix:
         version:
+          - '1.5'
+          - '1.7'
           - '1'
           - 'nightly'
         os:

test/driver_autoload.jl

@@ -1,6 +1,6 @@
 @testset "Automatic code loading for drivers" begin
     empty!(DataSets.PROJECT)
-    pushfirst!(LOAD_PATH, abspath("drivers"))
+    Pkg.develop(path=joinpath(@__DIR__, "drivers", "DummyStorageBackends"))
     ENV["JULIA_DATASETS_PATH"] = joinpath(@__DIR__, "DriverAutoloadData.toml")
     DataSets.__init__()
     @test haskey(DataSets._storage_drivers, "DummyTomlStorage")