Passing sqlContext when testing a method

I have the following test case:

  test("check foo") {
    val conf = new SparkConf()
    val sc = new SparkContext(conf)
    val sqlc = new SQLContext(sc)

    val res = foo("A", "B")
    assert(true)
  }

Which checks the following method:

  def foo(arg1: String, arg2: String) (implicit sqlContext: SQLContext) : Seq[String] = {
    //some other code
  }

When ruing the tests I get the following issue:

Error:(65, 42) could not find implicit value for parameter sqlContext: org.apache.spark.sql.SQLContext
val res = foo("A", "B")

How can I share the SqlContext instance I create in the test method with foo?