follow #15860 clean cgi module (#16487)

* follow #15860  clean cgi module

* follow #15860  clean cgi module

tests/gc/growobjcrash.nim

@@ -1,8 +1,4 @@
-discard """
-  output: "works"
-"""
-
-import cgi, strtabs
+import std/[cgi, strtabs]
 
 proc handleRequest(query: string): StringTableRef =
   iterator foo(): StringTableRef {.closure.} =
@@ -26,4 +22,3 @@ proc main =
           quit "but now a leak"
 
 main()
-echo "works"

tests/stdlib/tcgi.nim

@@ -1,25 +1,10 @@
-discard """
-  output: '''
+import std/unittest
+import std/[cgi, strtabs, sugar]
 
-[Suite] Test cgi module
-(key: "a", value: "1")
-(key: "b", value: "0")
-(key: "c", value: "3")
-(key: "d", value: "")
-(key: "e", value: "")
-(key: "a", value: "5")
-(key: "a", value: "t e x t")
-(key: "e", value: "http://w3schools.com/my test.asp?name=ståle&car=saab")
-'''
-"""
-
-import unittest
-import cgi, strtabs
-
-suite "Test cgi module":
+block: # Test cgi module
   const queryString = "foo=bar&фу=бар&checked=✓&list=1,2,3&with_space=text%20with%20space"
 
-  test "test query parsing with readData":
+  block: # test query parsing with readData
     let parsedQuery = readData(queryString)
 
     check parsedQuery["foo"] == "bar"
@@ -34,5 +19,8 @@ suite "Test cgi module":
 # bug #15369
 let queryString = "a=1&b=0&c=3&d&e&a=5&a=t%20e%20x%20t&e=http%3A%2F%2Fw3schools.com%2Fmy%20test.asp%3Fname%3Dst%C3%A5le%26car%3Dsaab"
 
-for pair in decodeData(queryString):
-  echo pair
+doAssert collect(for pair in decodeData(queryString): pair) ==
+  @[("a", "1"), ("b", "0"), ("c", "3"),
+    ("d", ""),("e", ""), ("a", "5"), ("a", "t e x t"),
+  ("e", "http://w3schools.com/my test.asp?name=ståle&car=saab")
+]