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In this updated code, I've added two configuration options: build_variant and enable_lint_checks. The build_variant option allows the user to choose between a debug or release build, while the enable_lint_checks option controls whether or not lint checks are enabled during the build process.
I've also added two test targets: unit_tests and instrumentation_tests. The unit_tests target runs unit tests on the JVM, while the instrumentation_tests target runs instrumented tests on an Android device or emulator. I've included dependencies for popular testing frameworks like JUnit and Mockito, as well as Espresso for UI testing.