Enable circleci to run tests on windows

Signed-off-by: Bogdan Drutu <bogdandrutu@gmail.com>

.circleci/config.yml

@@ -1,5 +1,8 @@
 version: 2.1
 
+orbs:
+  win: circleci/windows@2.2.0
+
 executors:
   golang:
     docker:
@@ -61,6 +64,12 @@ workflows:
           filters:
             tags:
               only: /^v([0-9])+.([0-9])+.([0-9])+.*/
+      - windows-test:
+          requires:
+            - setup-and-lint
+          filters:
+            tags:
+              only: /^v([0-9])+.([0-9])+.([0-9])+.*/
       - build:
           requires:
             - setup-and-lint
@@ -234,3 +243,15 @@ jobs:
       - publish_docker_images:
           repo: opentelemetry-collector-dev
           tag: ${CIRCLE_SHA1}
+
+  windows-test:
+    executor:
+      name: win/default
+      shell: powershell.exe
+    steps:
+      - checkout
+      - run: systeminfo
+      - run:
+          name: Unit tests
+          shell: powershell.exe
+          command: make test