Properly setup of test deps

Author: andreasnoack

Project.toml

@@ -5,4 +5,13 @@ uuid = "14197337-ba66-59df-a3e3-ca00e7dcff7a"
 LinearAlgebra = "37e2e46d-f89d-539d-b4ee-838fcccc9c8e"
 Printf = "de0858da-6303-5e67-8744-51eddeeeb8d7"
 Random = "9a3f8284-a2c9-5f02-9a11-845980a1fd5c"
+
+[extras]
+Quaternions = "94ee1d12-ae83-5a48-8b1c-48b8ff168ae0"
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
+
+[targets]
+test = ["Quaternions", "Test"]
+
+[compat]
+julia = "0.7, 1"