make tests more robust; tests should be deterministic, no randomize() calls in tests

tests/stdlib/tmath.nim

@@ -20,29 +20,29 @@ import sets, tables
 suite "random int":
   test "there might be some randomness":
     var set = initSet[int](128)
-    randomize()
+
     for i in 1..1000:
       incl(set, random(high(int)))
     check len(set) == 1000
   test "single number bounds work":
-    randomize()
+
     var rand: int
     for i in 1..1000:
       rand = random(1000)
       check rand < 1000
       check rand > -1
   test "slice bounds work":
-    randomize()
+
     var rand: int
     for i in 1..1000:
       rand = random(100..1000)
       check rand < 1000
       check rand >= 100
-  test "randomize() again gives new numbers":
-    randomize()
+  test " again gives new numbers":
+
     var rand1 = random(1000000)
     os.sleep(200)
-    randomize()
+
     var rand2 = random(1000000)
     check rand1 != rand2
 
@@ -50,29 +50,29 @@ suite "random int":
 suite "random float":
   test "there might be some randomness":
     var set = initSet[float](128)
-    randomize()
+
     for i in 1..100:
       incl(set, random(1.0))
     check len(set) == 100
   test "single number bounds work":
-    randomize()
+
     var rand: float
     for i in 1..1000:
       rand = random(1000.0)
       check rand < 1000.0
       check rand > -1.0
   test "slice bounds work":
-    randomize()
+
     var rand: float
     for i in 1..1000:
       rand = random(100.0..1000.0)
       check rand < 1000.0
       check rand >= 100.0
-  test "randomize() again gives new numbers":
-    randomize()
+  test " again gives new numbers":
+
     var rand1:float = random(1000000.0)
     os.sleep(200)
-    randomize()
+
     var rand2:float = random(1000000.0)
     check rand1 != rand2
 

tests/stdlib/tosproc.nim

@@ -93,4 +93,7 @@ else:
     doAssert outStr2 == absolutePath(testDir) & "\nx yz\n"
 
     removeDir(testDir)
-    removeFile(exePath)
+    try:
+      removeFile(exePath)
+    except OSError:
+      discard

tests/stdlib/tunittest.nim

@@ -50,7 +50,6 @@ test "unittest multiple requires":
 import math, random
 from strutils import parseInt
 proc defectiveRobot() =
-  randomize()
   case random(1..4)
   of 1: raise newException(OSError, "CANNOT COMPUTE!")
   of 2: discard parseInt("Hello World!")