diff --git a/testament/categories.nim b/testament/categories.nim
index d7e18c8b8..e1f173c26 100644
--- a/testament/categories.nim
+++ b/testament/categories.nim
@@ -297,25 +297,24 @@ proc testNimInAction(r: var TResults, cat: Category, options: string) =
   # whoever edits these hashes without dom96's permission, j/k. But please only
   # edit when making a conscious breaking change, also please try to make your
   # commit message clear and notify me so I can easily compile an errata later.
-  var testHashes: seq[string] = @[]
-
-  for test in tests:
-    testHashes.add(getMD5(readFile("tests" / test.addFileExt("nim")).string))
-
   const refHashes = @[
     "51afdfa84b3ca3d810809d6c4e5037ba", "30f07e4cd5eaec981f67868d4e91cfcf",
     "d14e7c032de36d219c9548066a97e846", "2e40bfd5daadb268268727da91bb4e81",
     "c5d3853ed0aba04bf6d35ba28a98dca0", "058603145ff92d46c009006b06e5b228",
     "7b94a029b94ddb7efafddd546c965ff6", "586d74514394e49f2370dfc01dd9e830",
-    "e1901837b757c9357dc8d259fd0ef0f6", "097670c7ae12e825debaf8ec3995227b",
-    "a8cb7b78cc78d28535ab467361db5d6e", "bfaec2816a1848991b530c1ad17a0184",
-    "47cb71bb4c1198d6d29cdbee05aa10b9", "87e4436809f9d73324cfc4f57f116770",
-    "7b7db5cddc8cf8fa9b6776eef1d0a31d", "e6e40219f0f2b877869b738737b7685e",
-    "6532ee87d819f2605a443d5e94f9422a", "9a8fe78c588d08018843b64b57409a02",
-    "03a801275b8b76b4170c870cd0da079d", "20bb7d3e2d38d43b0cb5fcff4909a4a8",
-    "af6844598f534fab6942abfa4dfe9ab2", "2a7a17f84f6503d9bc89a5ab8feea127"
+    "13febc363ed82585f2a60de40ddfefda", "c11a013db35e798f44077bc0763cc86d",
+    "3e32e2c5e9a24bd13375e1cd0467079c", "0b9fe7ba159623d49ae60db18a15037c",
+    "b2dd5293d7f784824bbf9792c6fb51ad", "4c19d8d9026bfe151b31d7007fa3c237",
+    "9415c6a568cfceed08da8378e95b5cd5", "da520038c153f4054cb8cc5faa617714",
+    "e6c6e061b6f77b2475db6fec7abfb7f4", "9a8fe78c588d08018843b64b57409a02",
+    "8b5d28e985c0542163927d253a3e4fc9", "783299b98179cc725f9c46b5e3b5381f",
+    "bc523f9a9921299090bac1af6c958e73", "80f9c3e594a798225046e8a42e990daf"
   ]
-  doAssert testHashes == refHashes, "Nim in Action tests were changed."
+
+  for i, test in tests:
+    let filename = "tests" / test.addFileExt("nim")
+    let testHash = getMD5(readFile(filename).string)
+    doAssert testHash == refHashes[i], "Nim in Action test " & filename & " was changed."
 
   # Run the tests.
   for testfile in tests:
@@ -328,8 +327,6 @@ proc testNimInAction(r: var TResults, cat: Category, options: string) =
   testCPP cppFile
 
 
-
-
 # ------------------------- manyloc -------------------------------------------
 #proc runSpecialTests(r: var TResults, options: string) =
 #  for t in ["lib/packages/docutils/highlite"]:
diff --git a/tests/niminaction/Chapter3/ChatApp/src/client.nim b/tests/niminaction/Chapter3/ChatApp/src/client.nim
index 4d139655c..d479ebf43 100644
--- a/tests/niminaction/Chapter3/ChatApp/src/client.nim
+++ b/tests/niminaction/Chapter3/ChatApp/src/client.nim
@@ -1,3 +1,7 @@
+discard """
+action: compile
+"""
+
 import os, threadpool, asyncdispatch, asyncnet
 import protocol
 
diff --git a/tests/niminaction/Chapter3/ChatApp/src/server.nim b/tests/niminaction/Chapter3/ChatApp/src/server.nim
index 8c572aeb0..31da74d16 100644
--- a/tests/niminaction/Chapter3/ChatApp/src/server.nim
+++ b/tests/niminaction/Chapter3/ChatApp/src/server.nim
@@ -1,3 +1,7 @@
+discard """
+action: compile
+"""
+
 import asyncdispatch, asyncnet
 
 type
@@ -81,4 +85,4 @@ when isMainModule:
   echo("Server initialised!")
   # Execute the ``loop`` procedure. The ``waitFor`` procedure will run the
   # asyncdispatch event loop until the ``loop`` procedure finishes executing.
-  waitFor loop(server)
\ No newline at end of file
+  waitFor loop(server)
diff --git a/tests/niminaction/Chapter3/various3.nim b/tests/niminaction/Chapter3/various3.nim
index 478229b00..7b2776d70 100644
--- a/tests/niminaction/Chapter3/various3.nim
+++ b/tests/niminaction/Chapter3/various3.nim
@@ -1,3 +1,9 @@
+discard """
+output: '''
+Future is no longer empty, 42
+'''
+"""
+
 import threadpool
 proc foo: string = "Dog"
 var x: FlowVar[string] = spawn foo()
@@ -33,9 +39,9 @@ let data = """
   {"username": "Dominik"}
 """
 
-let obj = parseJson(data) 
-assert obj.kind == JObject 
-assert obj["username"].kind == JString 
+let obj = parseJson(data)
+assert obj.kind == JObject
+assert obj["username"].kind == JString
 assert obj["username"].str == "Dominik"
 
 block:
@@ -60,12 +66,12 @@ var amy = Human(name: "Amy", age: 20)
 
 import asyncdispatch
 
-var future = newFuture[int]() 
-doAssert(not future.finished) 
+var future = newFuture[int]()
+doAssert(not future.finished)
 
-future.callback = 
-  proc (future: Future[int]) = 
-    echo("Future is no longer empty, ", future.read) 
+future.callback =
+  proc (future: Future[int]) =
+    echo("Future is no longer empty, ", future.read)
 
 future.complete(42)
 
@@ -85,9 +91,8 @@ import asyncdispatch, asyncfile, os
 proc readFiles() {.async.} =
   # --- Changed to getTempDir here.
   var file = openAsync(getTempDir() / "test.txt", fmReadWrite)
-  let data = await file.readAll() 
-  echo(data) 
-  await file.write("Hello!\n") 
+  let data = await file.readAll()
+  echo(data)
+  await file.write("Hello!\n")
 
 waitFor readFiles()
-
diff --git a/tests/niminaction/Chapter6/WikipediaStats/concurrency.nim b/tests/niminaction/Chapter6/WikipediaStats/concurrency.nim
index 478f533d9..f20e21f4d 100644
--- a/tests/niminaction/Chapter6/WikipediaStats/concurrency.nim
+++ b/tests/niminaction/Chapter6/WikipediaStats/concurrency.nim
@@ -1,3 +1,7 @@
+discard """
+action: compile
+"""
+
 # See this page for info about the format https://wikitech.wikimedia.org/wiki/Analytics/Data/Pagecounts-all-sites
 import tables, parseutils, strutils, threadpool
 
diff --git a/tests/niminaction/Chapter6/WikipediaStats/concurrency_regex.nim b/tests/niminaction/Chapter6/WikipediaStats/concurrency_regex.nim
index 8df3b6aeb..dbd635634 100644
--- a/tests/niminaction/Chapter6/WikipediaStats/concurrency_regex.nim
+++ b/tests/niminaction/Chapter6/WikipediaStats/concurrency_regex.nim
@@ -1,3 +1,7 @@
+discard """
+action: compile
+"""
+
 # See this page for info about the format https://wikitech.wikimedia.org/wiki/Analytics/Data/Pagecounts-all-sites
 import tables, parseutils, strutils, threadpool, re
 
diff --git a/tests/niminaction/Chapter6/WikipediaStats/naive.nim b/tests/niminaction/Chapter6/WikipediaStats/naive.nim
index ed4fba8e2..ce995efaf 100644
--- a/tests/niminaction/Chapter6/WikipediaStats/naive.nim
+++ b/tests/niminaction/Chapter6/WikipediaStats/naive.nim
@@ -1,3 +1,7 @@
+discard """
+action: compile
+"""
+
 # See this page for info about the format https://wikitech.wikimedia.org/wiki/Analytics/Data/Pagecounts-all-sites
 import tables, parseutils, strutils
 
diff --git a/tests/niminaction/Chapter6/WikipediaStats/parallel_counts.nim b/tests/niminaction/Chapter6/WikipediaStats/parallel_counts.nim
index 7181145e9..74857367a 100644
--- a/tests/niminaction/Chapter6/WikipediaStats/parallel_counts.nim
+++ b/tests/niminaction/Chapter6/WikipediaStats/parallel_counts.nim
@@ -1,3 +1,7 @@
+discard """
+action: compile
+"""
+
 import os, parseutils, threadpool, strutils
 
 type
@@ -69,4 +73,4 @@ proc readPageCounts(filename: string, chunkSize = 1_000_000) =
 when isMainModule:
   const file = "pagecounts-20160101-050000"
   let filename = getCurrentDir() / file
-  readPageCounts(filename)
\ No newline at end of file
+  readPageCounts(filename)
diff --git a/tests/niminaction/Chapter6/WikipediaStats/race_condition.nim b/tests/niminaction/Chapter6/WikipediaStats/race_condition.nim
index c62b2f93e..db68aeb5c 100644
--- a/tests/niminaction/Chapter6/WikipediaStats/race_condition.nim
+++ b/tests/niminaction/Chapter6/WikipediaStats/race_condition.nim
@@ -1,3 +1,7 @@
+discard """
+action: compile
+"""
+
 import threadpool
 
 var counter = 0
@@ -10,4 +14,4 @@ proc increment(x: int) =
 spawn increment(10_000)
 spawn increment(10_000)
 sync()
-echo(counter)
\ No newline at end of file
+echo(counter)
diff --git a/tests/niminaction/Chapter6/WikipediaStats/sequential_counts.nim b/tests/niminaction/Chapter6/WikipediaStats/sequential_counts.nim
index 25ad7d5f4..102dd15d3 100644
--- a/tests/niminaction/Chapter6/WikipediaStats/sequential_counts.nim
+++ b/tests/niminaction/Chapter6/WikipediaStats/sequential_counts.nim
@@ -1,3 +1,7 @@
+discard """
+action: compile
+"""
+
 import os, parseutils
 
 proc parse(line: string, domainCode, pageTitle: var string,
@@ -31,4 +35,4 @@ proc readPageCounts(filename: string) =
 when isMainModule:
   const file = "pagecounts-20160101-050000"
   let filename = getCurrentDir() / file
-  readPageCounts(filename)
\ No newline at end of file
+  readPageCounts(filename)
diff --git a/tests/niminaction/Chapter7/Tweeter/src/createDatabase.nim b/tests/niminaction/Chapter7/Tweeter/src/createDatabase.nim
index c7aee1b44..a7d4ebe00 100644
--- a/tests/niminaction/Chapter7/Tweeter/src/createDatabase.nim
+++ b/tests/niminaction/Chapter7/Tweeter/src/createDatabase.nim
@@ -1,6 +1,10 @@
+discard """
+output: "Database created successfully!"
+"""
+
 import database
 
 var db = newDatabase()
 db.setup()
 echo("Database created successfully!")
-db.close()
\ No newline at end of file
+db.close()
diff --git a/tests/niminaction/Chapter7/Tweeter/src/tweeter.nim b/tests/niminaction/Chapter7/Tweeter/src/tweeter.nim
index b8a36306e..12aaf49b8 100644
--- a/tests/niminaction/Chapter7/Tweeter/src/tweeter.nim
+++ b/tests/niminaction/Chapter7/Tweeter/src/tweeter.nim
@@ -1,3 +1,7 @@
+discard """
+action: compile
+"""
+
 import asyncdispatch, times
 
 import jester
diff --git a/tests/niminaction/Chapter7/Tweeter/tests/database_test.nim b/tests/niminaction/Chapter7/Tweeter/tests/database_test.nim
index 926ca452c..da69a004c 100644
--- a/tests/niminaction/Chapter7/Tweeter/tests/database_test.nim
+++ b/tests/niminaction/Chapter7/Tweeter/tests/database_test.nim
@@ -1,3 +1,7 @@
+discard """
+outputsub: "All tests finished successfully!"
+"""
+
 import database, os, times
 
 when isMainModule:
diff --git a/tests/niminaction/Chapter8/canvas/canvas.nim b/tests/niminaction/Chapter8/canvas/canvas.nim
index 713d1e9e2..ae2765630 100644
--- a/tests/niminaction/Chapter8/canvas/canvas.nim
+++ b/tests/niminaction/Chapter8/canvas/canvas.nim
@@ -1,3 +1,7 @@
+discard """
+action: compile
+"""
+
 import dom
 
 type
diff --git a/tests/niminaction/Chapter8/sdl/sdl_test.nim b/tests/niminaction/Chapter8/sdl/sdl_test.nim
index a572d5231..a49e08911 100644
--- a/tests/niminaction/Chapter8/sdl/sdl_test.nim
+++ b/tests/niminaction/Chapter8/sdl/sdl_test.nim
@@ -1,3 +1,7 @@
+discard """
+action: compile
+"""
+
 import os
 import sdl
 
diff --git a/tests/niminaction/Chapter8/sfml/sfml_test.nim b/tests/niminaction/Chapter8/sfml/sfml_test.nim
index 7d56d0903..e71060cb4 100644
--- a/tests/niminaction/Chapter8/sfml/sfml_test.nim
+++ b/tests/niminaction/Chapter8/sfml/sfml_test.nim
@@ -1,5 +1,6 @@
 discard """
-  disabled: "windows"
+action: compile
+disabled: "windows"
 """
 
 import sfml, os