How to get values bound to a FixedSqlAction in Slick for unit test assertions?

Question

I'd like to write better unit tests for Slick queries by testing that the correct values are bound in the right place.

Here's a simplified example of the type of method I'd like to test:

  def insertExample(
    key: String, name: String,
  ): FixedSqlAction[MyTableRow, NoStream, Effect.Write] = {
    (table returning table) += Tables.MyTableRow(key = key, name = name)
  }

And the unit test:

  "insertExample" should "return expected SQL" in {
    val context = mkContext

    val action = context.testClass.insertExample("some-key", "some name")

    val expectedSql = """insert into "my_table" ("key","name") values (?,?)"""


    action.statements.size mustBe 1
    action.statements.head mustEqual expectedSql
  }

I've been unable to find a way to see what the bound values are, all I can see is the sql with ? placeholders.

How can I check which values are bound to make assertions in the unit test?