Restructured folders and project names, ci should be fixed

.gitlab-ci.yml

@@ -1,12 +1,12 @@
-# taken from https://gitlab.com/forrestab/dotnet-gitlab-ci/blob/master/.gitlab-ci.yml
-image: mcr.microsoft.com/dotnet/core/sdk:3.1
+image: mcr.microsoft.com/dotnet/sdk:5.0
 
 stages:
   - build
-  # - test
+  - test
 
 variables:
   project: "NadekoBot"
+  tests: "Nadeko.Tests"
 
 before_script:
   - "dotnet restore"
@@ -19,11 +19,10 @@ build:
     - "cd $build_path"
     - "dotnet build -c Release"
 
-# test:
-#   image: mcr.microsoft.com/dotnet/core/sdk:2.1
-#   stage: test
-#   variables:
-#     tests_path: "Nadeko.Tests"
-#   script:
-#     - "cd $tests_path"
-#     - "dotnet test"
+test:
+  stage: test
+  variables:
+    tests_path: "src/$tests"
+  script:
+    - "cd $tests_path"
+    - "dotnet test"