1 files changed, 44 insertions, 0 deletions
diff --git a/src/test/scala/chiselTests/util/BitPatSpec.scala b/src/test/scala/chiselTests/util/BitPatSpec.scala
new file mode 100644
index 00000000..0c83493f
--- /dev/null
+++ b/src/test/scala/chiselTests/util/BitPatSpec.scala
@@ -0,0 +1,44 @@
+// SPDX-License-Identifier: Apache-2.0
+
+package chiselTests.util
+
+import chisel3.util.BitPat
+import org.scalatest.flatspec.AnyFlatSpec
+import org.scalatest.matchers.should.Matchers
+
+
+class BitPatSpec extends AnyFlatSpec with Matchers {
+  behavior of classOf[BitPat].toString
+
+  it should "convert a BitPat to readable form" in {
+    val testPattern = "0" * 32 + "1" * 32 + "?" * 32 + "?01" * 32
+    BitPat("b" + testPattern).toString should be (s"BitPat($testPattern)")
+  }
+
+  it should "convert a BitPat to raw form" in {
+    val testPattern = "0" * 32 + "1" * 32 + "?" * 32 + "?01" * 32
+    BitPat("b" + testPattern).rawString should be(testPattern)
+  }
+
+  it should "not fail if BitPat width is 0" in {
+    intercept[IllegalArgumentException]{BitPat("b")}
+  }
+
+  it should "contact BitPat via ##" in {
+    (BitPat.Y(4) ## BitPat.dontCare(3) ## BitPat.N(2)).toString should be (s"BitPat(1111???00)")
+  }
+
+  it should "index and return new BitPat" in {
+    val b = BitPat("b1001???")
+    b(0) should be(BitPat.dontCare(1))
+    b(6) should be(BitPat.Y())
+    b(5) should be(BitPat.N())
+  }
+
+  it should "slice and return new BitPat" in {
+    val b = BitPat("b1001???")
+    b(2, 0) should be(BitPat("b???"))
+    b(4, 3) should be(BitPat("b01"))
+    b(6, 6) should be(BitPat("b1"))
+  }
+}