Move left-right recovery test to JVM tests

core-tests/jvm/src/test/scala/zio/stm/ZSTMAlternativeSpec.scala

@@ -0,0 +1,20 @@
+package zio
+package stm
+
+import zio.test.Assertion._
+import zio.test._
+
+object ZSTMAlternativeSpec extends ZIOBaseSpec {
+  def spec =
+    suite("ZSTM.alternative") {
+      testM("retries left after right retries") {
+        for {
+          ref     <- TRef.makeCommit(0)
+          left    = ref.get.flatMap(v => STM.check(v > 500).as("left"))
+          right   = STM.retry
+          updater = ref.update(_ + 10).commit.forever
+          res     <- (left <|> right).commit.race(updater)
+        } yield assert(res)(equalTo("left"))
+      }
+    }
+}