persistence/play-java-jdbc/src/main/java/play/db/Databases.java
public static Database inMemoryWith(String k1, Object v1) {
    return inMemory(ImmutableMap.of(k1, v1));
  }
public static Database inMemoryWith(String k1, Object v1) {
    return inMemory(ImmutableMap.of(k1, v1));
  }
Create an in-memory H2 database with name "default" and with extra configuration provided by
the given entries.

@param k1 an H2 configuration key.
@param v1 configuration value corresponding to `k1`
@return a configured in-memory H2 database