weaver: replace `expect(.. == ..)` with `expect.same`

RenameExpectToExpectSame.scala

package fix

import scalafix.v1._
import scala.meta._
class RenameExpectToExpectSame extends SemanticRule("RenameExpectToExpectSame") {

  override def fix(implicit doc: SemanticDocument): Patch = {
    val expectMethod =
      SymbolMatcher.normalized("weaver/Expectations.Helpers#expect.")
    doc.tree.collect {
      case expectMethod(tree) =>
        val equalities = tree.collect {
          case [email protected](lhs, Term.Name("=="), _, List(rhs)) => (lhs, rhs)
        }
        equalities match {
          case (lhs, rhs) :: Nil => Patch.replaceTree(tree, s"expect.same($lhs, $rhs)")
          case _ => Patch.empty
        }
    }.asPatch
  }

}