Fix docs and adds tests for Headers

core/src/main/scala/dev/profunktor/fs2rabbit/model/Headers.scala

@@ -67,8 +67,8 @@ import scala.util.Try
   *   *   .remove("x-custom-header-3")
   *   */
   *
-  *   headers.getRaw[IO]("x-custom-header") // IO(StringVal("value"))
-  *   headers.getOptRaw("x-custom-header") // Some(StringVal("value"))
+  *   headers.get[IO]("x-custom-header") // IO(StringVal("value"))
+  *   headers.getOpt("x-custom-header") // Some(StringVal("value"))
   *
   *   headers.getAs[IO, String]("x-custom-header") // IO("value")
   *   headers.getOptAs[String]("x-custom-header") // Some("value")

core/src/main/scala/dev/profunktor/fs2rabbit/model/ShortString.scala

@@ -26,12 +26,14 @@ sealed abstract case class ShortString private (str: String)
 object ShortString {
   val MaxByteLength = 255
 
+  def isValid(str: String): Boolean =
+    str.getBytes("utf-8").length <= MaxByteLength
+
   def from(str: String): Option[ShortString] =
-    if (str.getBytes("utf-8").length <= MaxByteLength) {
+    if(isValid(str))
       Some(new ShortString(str) {})
-    } else {
+    else
       None
-    }
 
   /** This bypasses the safety check that [[from]] has. This is meant only for situations where you are certain the
     * string cannot be larger than [[MaxByteLength]] (e.g. string literals).

core/src/test/scala/dev/profunktor/fs2rabbit/model/codec/AmqpFieldIsoCodecSpec.scala

@@ -17,7 +17,7 @@
 package dev.profunktor.fs2rabbit.model.codec
 
 import cats.data.{NonEmptyList, NonEmptySeq}
-import dev.profunktor.fs2rabbit.model.AmqpFieldValue
+import dev.profunktor.fs2rabbit.model.{AmqpFieldValue, ShortString}
 import dev.profunktor.fs2rabbit.model.AmqpFieldValue._
 import dev.profunktor.fs2rabbit.model.codec.AmqpFieldDecoder.DecodingError
 import dev.profunktor.fs2rabbit.testing._
@@ -79,6 +79,9 @@ class AmqpFieldIsoCodecSpec extends AnyFunSuite with Matchers {
   testAmqpFieldCodecIso[List[Int]]
   testAmqpFieldCodecIso[Set[Int]]
 
+  // map
+  testAmqpFieldCodecIso[Map[ShortString, AmqpFieldValue]]
+
   // cats collections
   testAmqpFieldCodecIso[NonEmptyList[Int]]
   testAmqpFieldCodecIso[NonEmptySeq[Int]]

core/src/test/scala/dev/profunktor/fs2rabbit/testing/AmqpPropertiesArbs.scala

@@ -140,6 +140,12 @@ object AmqpPropertiesArbs {
       )
       .map(Headers(_))
 
+  implicit val arbShortString: Arbitrary[ShortString] = Arbitrary[ShortString] {
+    Gen.alphaStr
+      .filter(ShortString.isValid)
+      .map(ShortString.unsafeFrom)
+  }
+
   implicit val amqpProperties: Arbitrary[AmqpProperties] = Arbitrary[AmqpProperties] {
     for {
       contentType     <- Gen.option(Gen.alphaStr)