1 files changed, 31 insertions, 0 deletions
diff --git a/src/test/scala/firrtlTests/options/phases/WriteOutputAnnotationsSpec.scala b/src/test/scala/firrtlTests/options/phases/WriteOutputAnnotationsSpec.scala
index 4fe16041..9e58585c 100644
--- a/src/test/scala/firrtlTests/options/phases/WriteOutputAnnotationsSpec.scala
+++ b/src/test/scala/firrtlTests/options/phases/WriteOutputAnnotationsSpec.scala
@@ -142,6 +142,28 @@ class WriteOutputAnnotationsSpec extends AnyFlatSpec with Matchers with firrtl.t
     new File(serializedFileName) should (exist)
   }
 
+  it should "support CustomFileEmission to binary files" in new Fixture {
+    val file = new File("write-CustomFileEmission-binary-files.anno.json")
+    val data = Array[Byte](0x0a, 0xa0.toByte)
+    val annotations = Seq(
+      TargetDirAnnotation(dir),
+      OutputAnnotationFileAnnotation(file.toString),
+      WriteOutputAnnotationsSpec.Binary(data)
+    )
+
+    val serializedFileName = view[StageOptions](annotations).getBuildFileName("Binary", Some(".Emission"))
+    val out = phase.transform(annotations)
+
+    info(s"file '$serializedFileName' exists")
+    new File(serializedFileName) should (exist)
+
+    info(s"file '$serializedFileName' is correct")
+    val inputStream = new java.io.FileInputStream(serializedFileName)
+    val result = new Array[Byte](2)
+    inputStream.read(result)
+    result should equal(data)
+  }
+
   it should "error if multiple annotations try to write to the same file" in new Fixture {
     val file = new File("write-CustomFileEmission-annotations-error.anno.json")
     val annotations = Seq(
@@ -175,6 +197,15 @@ private object WriteOutputAnnotationsSpec {
 
   }
 
+  case class Binary(value: Array[Byte]) extends NoTargetAnnotation with CustomFileEmission {
+
+    override protected def baseFileName(a: AnnotationSeq): String = "Binary"
+
+    override protected def suffix: Option[String] = Some(".Emission")
+
+    override def getBytes: Iterable[Byte] = value
+  }
+
   case class Replacement(file: String) extends NoTargetAnnotation
 
 }