1 files changed, 56 insertions, 1 deletions
diff --git a/tests/stdlib/tdeques.nim b/tests/stdlib/tdeques.nim
index 8a788d337..39ff996d1 100644
--- a/tests/stdlib/tdeques.nim
+++ b/tests/stdlib/tdeques.nim
@@ -1,5 +1,5 @@
 discard """
-  matrix: "--gc:refc; --gc:orc"
+  matrix: "--mm:refc; --mm:orc"
   targets: "c cpp js"
 """
 
@@ -183,6 +183,61 @@ proc main() =
     clear(a)
     doAssert len(a) == 0
 
+  block: # bug #21278
+    var a = [10, 20, 30, 40].toDeque
+
+    a.shrink(fromFirst = 0, fromLast = 1)
+    doAssert $a == "[10, 20, 30]"
+
+  block:
+    var a, b: Deque[int]
+    for i in 1 .. 256:
+      a.addLast(i)
+    for i in 1 .. 255:
+      a.popLast
+    b.addLast(1)
+    doAssert a == b
+
+  block:
+    # Issue 23275
+    # Test `==`.
+    block:
+      var a, b = initDeque[int]()
+      doAssert a == b
+      doAssert a.hash == b.hash
+      a.addFirst(1)
+      doAssert a != b
+      doAssert a.hash != b.hash
+      b.addLast(1)
+      doAssert a == b
+      doAssert a.hash == b.hash
+      a.popFirst
+      b.popLast
+      doAssert a == b
+      doAssert a.hash == b.hash
+      a.addLast 2
+      doAssert a != b
+      doAssert a.hash != b.hash
+      b.addFirst 2
+      doAssert a == b
+      doAssert a.hash == b.hash
+
+    block:
+      var a, b = initDeque[int]()
+      for i in countDown(100, 1):
+        a.addFirst(i)
+      for i in 1..100:
+        b.addLast(i)
+      doAssert a == b
+      for i in 1..99:
+        a.popLast
+      let a1 = [1].toDeque
+      doAssert a == a1
+      doAssert a.hash == a1.hash
+      var c = initDeque[int]()
+      c.addLast(1)
+      doAssert a == c
+      doAssert a.hash == c.hash
 
 static: main()
 main()