Add input validations with tests.

.github/workflows/test.yml

@@ -8,11 +8,10 @@ on:
 jobs:
   test:
     runs-on: macOS-latest
+    timeout-minutes: 20
     strategy:
       matrix:
-        api-level: [28, 29]
-        target: [default, google_apis]
-        abi: [x86, x86_64]
+        api-level: [21, 29]
     steps:
     - name: checkout
       uses: actions/checkout@v1
@@ -29,6 +28,6 @@ jobs:
       uses: ./
       with: 
         api-level: ${{ matrix.api-level }}
-        target: ${{ matrix.target }}
-        abi: ${{ matrix.abi }}
+        target: default
+        abi: x86
         headless: true