9 files changed, 14 insertions, 9 deletions
diff --git a/tests/niminaction/Chapter1/various1.nim b/tests/niminaction/Chapter1/various1.nim
index 4e2cb463d..21553dc40 100644
--- a/tests/niminaction/Chapter1/various1.nim
+++ b/tests/niminaction/Chapter1/various1.nim
@@ -32,7 +32,7 @@ block: # Block added due to clash.
   let dog = Dog()
   dog.bark() #<2>
 
-import sequtils, future, strutils
+import sequtils, sugar, strutils
 let list = @["Dominik Picheta", "Andreas Rumpf", "Desmond Hume"]
 list.map(
   (x: string) -> (string, string) => (x.split[0], x.split[1])
diff --git a/tests/niminaction/Chapter2/resultaccept.nim b/tests/niminaction/Chapter2/resultaccept.nim
index 7dd976b40..390f7b329 100644
--- a/tests/niminaction/Chapter2/resultaccept.nim
+++ b/tests/niminaction/Chapter2/resultaccept.nim
@@ -22,7 +22,7 @@ proc resultVar2: string =
   result.add("returned")
 
 doAssert implicit() == "I will be returned"
-doAssert discarded() == nil
+doAssert discarded().len == 0
 doAssert explicit() == "I will be returned"
 doAssert resultVar() == "I will be returned"
 doAssert resultVar2() == "I will be returned"
\ No newline at end of file
diff --git a/tests/niminaction/Chapter2/various2.nim b/tests/niminaction/Chapter2/various2.nim
index 488c361a2..921f38c7d 100644
--- a/tests/niminaction/Chapter2/various2.nim
+++ b/tests/niminaction/Chapter2/various2.nim
@@ -140,7 +140,7 @@ let numbers = @[1, 2, 3, 4, 5, 6]
 let odd = filter(numbers, proc (x: int): bool = x mod 2 != 0)
 doAssert odd == @[1, 3, 5]
 
-import sequtils, future
+import sequtils, sugar
 let numbers1 = @[1, 2, 3, 4, 5, 6]
 let odd1 = filter(numbers1, (x: int) -> bool => x mod 2 != 0)
 assert odd1 == @[1, 3, 5]
@@ -149,7 +149,7 @@ proc isValid(x: int, validator: proc (x: int): bool) =
   if validator(x): echo(x, " is valid")
   else: echo(x, " is NOT valid")
 
-import future
+import sugar
 proc isValid2(x: int, validator: (x: int) -> bool) =
   if validator(x): echo(x, " is valid")
   else: echo(x, " is NOT valid")
@@ -193,7 +193,7 @@ doAssertRaises(IndexDefect):
 
 block:
   var list = newSeq[string](3)
-  assert list[0] == nil
+  assert list[0].len == 0
   list[0] = "Foo"
   list[1] = "Bar"
   list[2] = "Baz"
diff --git a/tests/niminaction/Chapter3/various3.nim b/tests/niminaction/Chapter3/various3.nim
index 4e028a048..c7cdf7db4 100644
--- a/tests/niminaction/Chapter3/various3.nim
+++ b/tests/niminaction/Chapter3/various3.nim
@@ -1,4 +1,5 @@
 discard """
+matrix: "--mm:refc"
 output: '''
 Future is no longer empty, 42
 '''
diff --git a/tests/niminaction/Chapter7/Tweeter/src/createDatabase.nim b/tests/niminaction/Chapter7/Tweeter/src/createDatabase.nim
index a7d4ebe00..67d9323f2 100644
--- a/tests/niminaction/Chapter7/Tweeter/src/createDatabase.nim
+++ b/tests/niminaction/Chapter7/Tweeter/src/createDatabase.nim
@@ -1,4 +1,5 @@
 discard """
+disabled: true
 output: "Database created successfully!"
 """
 
diff --git a/tests/niminaction/Chapter7/Tweeter/src/tweeter.nim b/tests/niminaction/Chapter7/Tweeter/src/tweeter.nim
index fe39278fb..1b521521c 100644
--- a/tests/niminaction/Chapter7/Tweeter/src/tweeter.nim
+++ b/tests/niminaction/Chapter7/Tweeter/src/tweeter.nim
@@ -1,5 +1,7 @@
 discard """
+disabled: true
 action: compile
+matrix: "--threads:off"
 """
 
 import asyncdispatch, times
diff --git a/tests/niminaction/Chapter7/Tweeter/tests/database_test.nim b/tests/niminaction/Chapter7/Tweeter/tests/database_test.nim
index a3cab4cba..c8beb4a30 100644
--- a/tests/niminaction/Chapter7/Tweeter/tests/database_test.nim
+++ b/tests/niminaction/Chapter7/Tweeter/tests/database_test.nim
@@ -1,4 +1,5 @@
 discard """
+disabled: true
 outputsub: "All tests finished successfully!"
 """
 
diff --git a/tests/niminaction/Chapter8/sdl/sdl.nim b/tests/niminaction/Chapter8/sdl/sdl.nim
index 7ba154cae..212f7b022 100644
--- a/tests/niminaction/Chapter8/sdl/sdl.nim
+++ b/tests/niminaction/Chapter8/sdl/sdl.nim
@@ -1,8 +1,8 @@
-when defined(Windows):
+when defined(windows):
   const libName* = "SDL2.dll"
-elif defined(Linux) or defined(freebsd) or defined(netbsd):
+elif defined(linux) or defined(freebsd) or defined(netbsd):
   const libName* = "libSDL2.so"
-elif defined(MacOsX):
+elif defined(macosx):
   const libName* = "libSDL2.dylib"
 elif defined(openbsd):
   const libName* = "libSDL2.so.0.6"
diff --git a/tests/niminaction/Chapter8/sdl/sdl_test.nim b/tests/niminaction/Chapter8/sdl/sdl_test.nim
index 1c4d258fb..db1700e0d 100644
--- a/tests/niminaction/Chapter8/sdl/sdl_test.nim
+++ b/tests/niminaction/Chapter8/sdl/sdl_test.nim
@@ -18,7 +18,7 @@ renderer.setDrawColor 29, 64, 153, 255
 renderer.clear
 renderer.setDrawColor 255, 255, 255, 255
 
-when defined(c):
+when false: # no long work with gcc 14!
   # just to ensure code from NimInAction still works, but
   # the `else` branch would work as well in C mode
   var points = [