Omit `-sdk` option and use `test` target instead of `build-for-testing …`

.travis.yml

@@ -3,10 +3,10 @@ matrix:
   include:
   - script:
     - set -o pipefail
-    - xcodebuild -scheme Base32 -sdk macosx build-for-testing test | xcpretty
-    - xcodebuild -scheme Base32 -sdk iphonesimulator -destination "name=iPhone 7" build-for-testing test | xcpretty
-    - xcodebuild -scheme Base32 -sdk appletvsimulator -destination "name=Apple TV 1080p" build-for-testing test | xcpretty
-    - xcodebuild -scheme Base32 -sdk watchsimulator -destination "name=Apple Watch - 38mm" build | xcpretty
+    - xcodebuild -scheme Base32 test | xcpretty
+    - xcodebuild -scheme Base32 test -destination "name=iPhone 7" | xcpretty
+    - xcodebuild -scheme Base32 test -destination "name=Apple TV 1080p" | xcpretty
+    - xcodebuild -scheme Base32 build -destination "name=Apple Watch - 38mm" | xcpretty
     - swift test
     env: JOB=macOS
     os: osx