Set up CircleCI config

Author: koji-1009

.circleci/config.yml

@@ -0,0 +1,44 @@
+version: 2.1
+executors:
+  default:
+    docker:
+      - image: circleci/android:api-28
+    environment:
+      JAVA_OPTS: -Xmx3200m
+
+commands:
+  setup:
+    steps:
+      - restore_cache:
+          key: v1-gradle-cache-{{ checksum "build.gradle" }}-{{ checksum  "app/build.gradle" }}
+      - run:
+          name: Download Dependencies
+          command: ./gradlew androidDependencies
+      - save_cache:
+          paths:
+            - ~/.gradle
+          key: v1-gradle-cache-{{ checksum "build.gradle" }}-{{ checksum  "app/build.gradle" }}
+  unit_test:
+    steps:
+      - run:
+          name: Run Tests
+          command: ./gradlew lint test
+      - store_artifacts:
+          path: app/build/reports
+          destination: reports
+      - store_test_results:
+          path: app/build/test-results
+
+jobs:
+  run_test:
+    executor:
+      name: default
+    steps:
+      - checkout
+      - setup
+      - unit_test
+
+workflows:
+  test:
+    jobs:
+      - run_test