Add no-plugin-tests for testing Chisel without the compiler plugin

This is a new SBT build unit that symlinks in some files from the normal
chisel project tests, but builds them without the compiler plugin.

.github/workflows/test.yml

@@ -35,7 +35,7 @@ jobs:
         if: matrix.scala == '2.12.13'
         run: sbt ++${{ matrix.scala }} docs/mdoc
       - name: Test
-        run: sbt ++${{ matrix.scala }} test
+        run: sbt ++${{ matrix.scala }} test noPluginTests/test
       - name: Binary compatibility
         run: sbt ++${{ matrix.scala }} mimaReportBinaryIssues
 

build.sbt

@@ -201,6 +201,11 @@ lazy val chisel = (project in file(".")).
     )
   )
 
+lazy val noPluginTests = (project in file ("no-plugin-tests")).
+  dependsOn(chisel).
+  settings(commonSettings: _*).
+  settings(chiselSettings: _*)
+
 lazy val docs = project       // new documentation project
   .in(file("docs-target")) // important: it must not be docs/
   .dependsOn(chisel)

no-plugin-tests/src/test/scala/chisel3/testers/TestUtils.scala

@@ -0,0 +1 @@
+../../../../../../src/test/scala/chisel3/testers/TestUtils.scala

no-plugin-tests/src/test/scala/chiselTests/ChiselSpec.scala

@@ -0,0 +1 @@
+../../../../../src/test/scala/chiselTests/ChiselSpec.scala

no-plugin-tests/src/test/scala/chiselTests/InstanceNameSpec.scala

@@ -0,0 +1 @@
+../../../../../src/test/scala/chiselTests/InstanceNameSpec.scala

src/test/scala/chiselTests/ChiselSpec.scala

@@ -90,62 +90,8 @@ trait ChiselRunners extends Assertions with BackendCompilationUtilities {
 /** Spec base class for BDD-style testers. */
 abstract class ChiselFlatSpec extends AnyFlatSpec with ChiselRunners with Matchers
 
-class ChiselTestUtilitiesSpec extends ChiselFlatSpec {
-  import org.scalatest.exceptions.TestFailedException
-  // Who tests the testers?
-  "assertKnownWidth" should "error when the expected width is wrong" in {
-    val caught = intercept[ChiselException] {
-      assertKnownWidth(7) {
-        Wire(UInt(8.W))
-      }
-    }
-    assert(caught.getCause.isInstanceOf[TestFailedException])
-  }
-
-  it should "error when the width is unknown" in {
-    a [ChiselException] shouldBe thrownBy {
-      assertKnownWidth(7) {
-        Wire(UInt())
-      }
-    }
-  }
-
-  it should "work if the width is correct" in {
-    assertKnownWidth(8) {
-      Wire(UInt(8.W))
-    }
-  }
-
-  "assertInferredWidth" should "error if the width is known" in {
-    val caught = intercept[ChiselException] {
-      assertInferredWidth(8) {
-        Wire(UInt(8.W))
-      }
-    }
-    assert(caught.getCause.isInstanceOf[TestFailedException])
-  }
-
-  it should "error if the expected width is wrong" in {
-    a [TestFailedException] shouldBe thrownBy {
-      assertInferredWidth(8) {
-        val w = Wire(UInt())
-        w := 2.U(2.W)
-        w
-      }
-    }
-  }
-
-  it should "pass if the width is correct" in {
-    assertInferredWidth(4) {
-      val w = Wire(UInt())
-      w := 2.U(4.W)
-      w
-    }
-  }
-}
-
 /** Spec base class for property-based testers. */
-class ChiselPropSpec extends PropSpec with ChiselRunners with ScalaCheckPropertyChecks with Matchers {
+abstract class ChiselPropSpec extends PropSpec with ChiselRunners with ScalaCheckPropertyChecks with Matchers {
 
   // Constrain the default number of instances generated for every use of forAll.
   implicit override val generatorDrivenConfig: PropertyCheckConfiguration =

src/test/scala/chiselTests/ChiselTestUtilitiesSpec.scala

@@ -0,0 +1,60 @@
+// SPDX-License-Identifier: Apache-2.0
+
+package chiselTests
+
+import chisel3._
+import org.scalatest.exceptions.TestFailedException
+
+class ChiselTestUtilitiesSpec extends ChiselFlatSpec {
+  // Who tests the testers?
+  "assertKnownWidth" should "error when the expected width is wrong" in {
+    val caught = intercept[ChiselException] {
+      assertKnownWidth(7) {
+        Wire(UInt(8.W))
+      }
+    }
+    assert(caught.getCause.isInstanceOf[TestFailedException])
+  }
+
+  it should "error when the width is unknown" in {
+    a [ChiselException] shouldBe thrownBy {
+      assertKnownWidth(7) {
+        Wire(UInt())
+      }
+    }
+  }
+
+  it should "work if the width is correct" in {
+    assertKnownWidth(8) {
+      Wire(UInt(8.W))
+    }
+  }
+
+  "assertInferredWidth" should "error if the width is known" in {
+    val caught = intercept[ChiselException] {
+      assertInferredWidth(8) {
+        Wire(UInt(8.W))
+      }
+    }
+    assert(caught.getCause.isInstanceOf[TestFailedException])
+  }
+
+  it should "error if the expected width is wrong" in {
+    a [TestFailedException] shouldBe thrownBy {
+      assertInferredWidth(8) {
+        val w = Wire(UInt())
+        w := 2.U(2.W)
+        w
+      }
+    }
+  }
+
+  it should "pass if the width is correct" in {
+    assertInferredWidth(4) {
+      val w = Wire(UInt())
+      w := 2.U(4.W)
+      w
+    }
+  }
+}
+