1 files changed, 32 insertions, 0 deletions
diff --git a/tests/stdlib/t21564.nim b/tests/stdlib/t21564.nim
new file mode 100644
index 000000000..0a5777d12
--- /dev/null
+++ b/tests/stdlib/t21564.nim
@@ -0,0 +1,32 @@
+discard """
+targets: "c js"
+"""
+
+import bitops
+import std/assertions
+
+proc main() =
+  block: # bug #21564
+    # tesk `bitops.bitsliced` patch
+    doAssert(0x17.bitsliced(4..7) == 0x01)
+    doAssert(0x17.bitsliced(0..3) == 0x07)
+
+  block:
+    # test in-place `bitops.bitslice`
+    var t = 0x12F4
+    t.bitslice(4..7)
+
+    doAssert(t == 0xF)
+
+  block:
+    # test `bitops.toMask` patch via bitops.masked
+    doAssert(0x12FFFF34.masked(8..23) == 0x00FFFF00)
+
+  block: # bug #22687
+    var a: uint8 = 0b1111_1111
+    doAssert a.bitsliced(4..7).int == 15
+
+main()
+
+static:
+  main()