Starting to write tests for character reader.

modules/parser/src/test/resources/test-source-1.ava

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+namespace tests
+
+given A
+class Semigroup
+    defn combine: A -> A -> A
+end class
+
+given A :: Semigroup
+class Monoid
+    defn empty: A
+end class

modules/parser/src/test/scala/ava/parser/CharacterReaderTests.scala

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+package ava.parser
+
+import cats.effect.IO
+import cats.effect.unsafe.IORuntime
+import java.io.InputStream
+import scala.io.Source
+
+class CharacterReaderTests extends munit.FunSuite:
+  import CharacterReaderTests.*
+
+  implicit val runtime: IORuntime = cats.effect.unsafe.IORuntime.global
+
+  test("should read a file end to end") {
+    val file     = Files.TestSource1
+    val expected = loadFileToString(file)
+    val reader   = CharacterReader.forInputStream(loadFileToStream(file))
+
+    val output = fs2.Stream
+      .repeatEval(IO(reader.consume()))
+      .takeWhile(_.isDefined)
+      .compile
+      .toList
+      .map(_.flatten)
+      .map(_.mkString)
+      .unsafeRunSync()
+
+    assertEquals(output, expected)
+  }
+
+  private def loadFileToString(name: String): String =
+    Source.fromResource(name).mkString
+
+  private def loadFileToStream(name: String): InputStream =
+    getClass().getClassLoader().getResourceAsStream(name)
+
+object CharacterReaderTests:
+
+  object Files:
+    val TestSource1: String = "test-source-1.ava"