move tests to testament (#16101)

* move tests to testament

* minor

* fix random

* disable test random

tests/stdlib/tparseutils.nim

@@ -0,0 +1,43 @@
+import parseutils
+import sequtils
+
+let input = "$test{}  $this is ${an{  example}}  "
+let expected = @[(ikVar, "test"), (ikStr, "{}  "), (ikVar, "this"),
+                  (ikStr, " is "), (ikExpr, "an{  example}"), (ikStr, "  ")]
+doAssert toSeq(interpolatedFragments(input)) == expected
+
+var value = 0
+discard parseHex("0x38", value)
+doAssert value == 56
+
+value = -1
+doAssert(parseSaturatedNatural("848", value) == 3)
+doAssert value == 848
+
+value = -1
+discard parseSaturatedNatural("84899999999999999999324234243143142342135435342532453", value)
+doAssert value == high(int)
+
+value = -1
+discard parseSaturatedNatural("9223372036854775808", value)
+doAssert value == high(int)
+
+value = -1
+discard parseSaturatedNatural("9223372036854775807", value)
+doAssert value == high(int)
+
+value = -1
+discard parseSaturatedNatural("18446744073709551616", value)
+doAssert value == high(int)
+
+value = -1
+discard parseSaturatedNatural("18446744073709551615", value)
+doAssert value == high(int)
+
+value = -1
+doAssert(parseSaturatedNatural("1_000_000", value) == 9)
+doAssert value == 1_000_000
+
+var i64Value: int64
+discard parseBiggestInt("9223372036854775807", i64Value)
+doAssert i64Value == 9223372036854775807