Gradle will automatically fetch all required dependencies for you.
Long story short:
mvn update ~= ./gradlew build --refresh-dependencies
mvn clean install ~= ./gradlew clean build
TL;DR
To force Gradle to redownload dependencies you can execute (How can I force gradle to redownload dependencies?):
./gradlew build --refresh-dependencies
To assemble you project without executing tests (Gradle build without tests):
./gradlew assemble
To completely build you project with test execution:
./gradlew build
You can skip certain tasks by providing -x argument:
./gradlew build -x test