Add ArrayDeque to valid Buffer implementations

pprint/test/src-2/test/pprint/HorizontalVersionSpecificTests.scala

@@ -8,7 +8,8 @@ object HorizontalVersionSpecificTests extends TestSuite{
   val tests = TestSuite{
     test("Stream") - Check(
       Stream('omg, 'wtf, 'bbq),
-      """Stream('omg, 'wtf, 'bbq)"""
+      """Stream('omg, 'wtf, 'bbq)""",
+      """Stream(Symbol(omg), <not computed>)"""
     )
   }
 }

pprint/test/src/test/pprint/HorizontalTests.scala

@@ -1,6 +1,7 @@
 package test.pprint
 
 import utest._
+import pprint.PPrinter
 
 import scala.collection.{mutable, immutable => imm}
 
@@ -112,13 +113,22 @@ object HorizontalTests extends TestSuite{
         test("Buffer") - Check(
           mutable.Buffer("omg", "wtf", "bbq"),
           """ArrayBuffer("omg", "wtf", "bbq")""",
-          """WrappedArray("omg", "wtf", "bbq")"""
+          """WrappedArray("omg", "wtf", "bbq")""",
+          """ArrayDeque("omg", "wtf", "bbq")""",
         )
 
-        test("stream") - Check(
-          Stream.continually("foo"),
-          """Stream(foo, <not computed>)"""
-        )
+        test("stream") - {
+          val pprinted = fansi.Str.join(
+            PPrinter.BlackWhite.tokenize(Stream.continually("foo"), 100, 9999).toStream
+          ).plainText
+
+          utest.assert(
+            pprinted == "Stream(foo, <not computed>)" ||
+              pprinted.startsWith("Stream(") &&
+              pprinted.contains("foo") &&
+              pprinted.contains("\n")
+          )
+        }
 
         test("Iterable") - Check(Iterable("omg", "wtf", "bbq"), """List("omg", "wtf", "bbq")""")
         test("Set") - Check(Set("omg"), """Set("omg")""")
@@ -151,7 +161,7 @@ object HorizontalTests extends TestSuite{
         )
 
         test("StringBuilder") - Check(
-          mutable.StringBuilder("example"),
+          new mutable.StringBuilder().append("example"),
           """ "example" """
         )
       }