1 files changed, 42 insertions, 0 deletions
diff --git a/src/test/scala/chiselTests/WarningSpec.scala b/src/test/scala/chiselTests/WarningSpec.scala
new file mode 100644
index 00000000..1cef1ffc
--- /dev/null
+++ b/src/test/scala/chiselTests/WarningSpec.scala
@@ -0,0 +1,42 @@
+// SPDX-License-Identifier: Apache-2.0
+
+package chiselTests
+
+import chisel3._
+import chisel3.util._
+import chisel3.stage.ChiselStage
+import chisel3.experimental.ChiselEnum
+import chisel3.experimental.EnumType
+
+class WarningSpec extends ChiselFlatSpec with Utils {
+  behavior.of("Warnings")
+
+  object MyEnum extends ChiselEnum {
+    val e0, e1, e2 = Value
+  }
+
+  class MyModule extends Module {
+    val in = IO(Input(UInt(2.W)))
+    val out1 = IO(Output(MyEnum()))
+    val out2 = IO(Output(MyEnum()))
+    def func(out: EnumType): Unit = {
+      out := MyEnum(in)
+    }
+    func(out1)
+    func(out2)
+  }
+
+  "Warnings" should "be de-duplicated" in {
+    val (log, _) = grabLog(ChiselStage.elaborate(new MyModule))
+    def countSubstring(s: String, sub: String) =
+      s.sliding(sub.length).count(_ == sub)
+    countSubstring(log, "Casting non-literal UInt") should be(1)
+  }
+
+  "Warnings" should "be treated as errors with warningsAsErrors" in {
+    a[ChiselException] should be thrownBy extractCause[ChiselException] {
+      val args = Array("--warnings-as-errors")
+      (new ChiselStage).emitChirrtl(new MyModule, args)
+    }
+  }
+}