1 files changed, 50 insertions, 0 deletions
diff --git a/tests/js/tarrayboundscheck.nim b/tests/js/tarrayboundscheck.nim
new file mode 100644
index 000000000..d8bf8de97
--- /dev/null
+++ b/tests/js/tarrayboundscheck.nim
@@ -0,0 +1,50 @@
+discard """
+  output: '''idx out of bounds: -1
+month out of bounds: 0
+Jan
+Feb
+Mar
+Apr
+May
+Jun
+Jul
+Aug
+Sep
+Oct
+Nov
+Dec
+month out of bounds: 13
+idx out of bounds: 14
+'''
+"""
+
+{.push boundChecks:on.}
+
+# see issue #6532:
+# js backend 0.17.3: array bounds check for non zero based arrays is buggy
+
+proc test_arrayboundscheck() =
+  var months: array[1..12, string] =
+    ["Jan", "Feb", "Mar", "Apr", "May", "Jun",
+     "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"]
+
+  var indices = [0,1,2,3,4,5,6,7,8,9,10,11,12,13]
+
+  for i in -1 .. 14:
+    try:
+      let idx = indices[i]
+      try:
+        echo months[idx]
+      except:
+        echo "month out of bounds: ", idx
+    except:
+      echo "idx out of bounds: ", i
+  
+  # #13966
+  var negativeIndexed: array[-2..2, int] = [0, 1, 2, 3, 4]
+  negativeIndexed[-1] = 2
+  negativeIndexed[1] = 2
+  doAssert negativeIndexed == [0, 2, 2, 2, 4]
+
+test_arrayboundscheck()
+{.pop.}
\ No newline at end of file