test: failing wider elements test.

src/test/scala/ee/hrzn/chryse/platform/cxxrtl/BlackBoxGeneratorSpec.scala

@@ -41,6 +41,20 @@ class BlackBoxGeneratorSpec extends AnyFlatSpec with Matchers {
                               |  attribute \cxxrtl_sync 1
                               |  wire output 5 \d_out_1
                               |end
+""".stripMargin)
+  }
+
+  it should "expand wider elements correctly" in {
+    val sw = new StringWriter
+    BlackBoxGenerator(sw, classOf[WiderElementsBB])
+    sw.toString() should be("""attribute \cxxrtl_blackbox 1
+                              |attribute \blackbox 1
+                              |module \WiderElementsBB
+                              |  wire input 1 width 64 \d_in
+                              |
+                              |  attribute \cxxrtl_sync 1
+                              |  wire output 2 width 8 \d_out
+                              |end
 """.stripMargin)
   }
 }
@@ -60,3 +74,10 @@ private class VecOfBoolBB extends BlackBox {
     val d_out = Output(Vec(2, Bool()))
   })
 }
+
+private class WiderElementsBB extends BlackBox {
+  val io = IO(new Bundle {
+    val d_in  = Input(UInt(64.W))
+    val d_out = Input(SInt(8.W))
+  })
+}