Missing TestLens#cause Macro Implementation

[khajavi]

I expect the following code to compile:

test("TestLens#cause") {
  for {
    exit <- ZIO.failCause(Cause.fail("Boom!")).exit
  } yield assertTrue(exit.is(_.cause) == Cause.fail("Boom!"))
}

But fails with the following errors:

[info] compiling 4 Scala sources to /home/milad/sources/scala/zio-2.x-new/examples/jvm/target/scala-2.13/test-classes ...
[error] /home/milad/sources/scala/zio-2.x-new/examples/shared/src/test/scala/zio/examples/test/TestTest.scala:65:21: type mismatch;
[error]  found   : zio.test.TestArrow[zio.Cause[String],Boolean]
[error]  required: zio.test.TestArrow[zio.Exit[String,Nothing],?]
[error]   } yield assertTrue(exit.is(_.cause) == Cause.fail("Boom!"))

Here is a hint for anyone who wants to fix it:

1. There is a missing case for "cause" case on parseAsAssertion
2. Also, we need a helper method to create a TestArrow from Exit[E, A] to Cause[E] inside SmartAssertions object.