improve tests for collections (#16328)

* improve tests for collections

* remove remaining code blocks in deques.nim

* improve runnableExamples

1 files changed, 18 insertions, 0 deletions

diff --git a/tests/stdlib/tcritbits.nim b/tests/stdlib/tcritbits.nim
index 4b05cd950..7b2dde1c8 100644
--- a/tests/stdlib/tcritbits.nim
+++ b/tests/stdlib/tcritbits.nim
@@ -1,3 +1,7 @@
+discard """
+  targets: "c js"
+"""
+
 import std/[sequtils,critbits]
 
 template main =
@@ -65,5 +69,19 @@ template main =
     discard strings.containsOrIncl("foo", 3)
     doAssert strings["foo"] == 3
 
+  block tcritbitsToString:
+    block:
+      var t: CritBitTree[int]
+      t["a"] = 1
+      doAssert $t == """{"a": 1}"""
+    block:
+      var t: CritBitTree[string]
+      t["a"] = "1"
+      doAssert $t == """{"a": "1"}"""
+    block:
+      var t: CritBitTree[char]
+      t["a"] = '1'
+      doAssert $t == """{"a": '1'}"""
+
 main()
 static: main()