diff --git a/tests/vault/gear/work-force-test.cpp b/tests/vault/gear/work-force-test.cpp
index d5bf80e55..c7f7d159a 100644
--- a/tests/vault/gear/work-force-test.cpp
+++ b/tests/vault/gear/work-force-test.cpp
@@ -28,7 +28,8 @@
 #include "lib/test/run.hpp"
 #include "vault/gear/work-force.hpp"
 //#include "lib/time/timevalue.hpp"
-#include "lib/format-cout.hpp"   ///////////////////////////////WIP
+//#include "lib/format-cout.hpp"   ///////////////////////////////WIP
+#include "lib/test/diagnostic-output.hpp"   ///////////////////////////////WIP
 //#include "lib/util.hpp"
 
 //#include <utility>
@@ -150,12 +151,27 @@ namespace test {
       
       
       
-      /** @test TODO
-       * @todo WIP 9/23 ⟶ define ⟶ implement
+      /** @test can cause a worker to terminate by return-value from the work-functor
        */
       void
       verify_workerHalt()
         {
+          atomic<uint> check{0};
+          atomic<activity::Proc> control{activity::PASS};
+          WorkForce wof{setup ([&]{ ++check; return activity::Proc(control); })};
+          
+          wof.incScale();
+          sleep_for(1ms);
+          
+          uint invocations = check;
+          CHECK (0 < invocations);
+          
+          control = activity::HALT;
+          sleep_for(1ms);
+          
+          invocations = check;
+          sleep_for(10ms);
+          CHECK (invocations == check);
         }
       
       
@@ -234,12 +250,31 @@ namespace test {
       
       
       
-      /** @test TODO
-       * @todo WIP 9/23 ⟶ define ⟶ implement
+      /** @test dynamically determine count of currently active workers.
        */
       void
       verify_countActive()
         {
+          atomic<uint> check{0};
+          WorkForce wof{setup ([&]{
+                                    ++check;
+                                    if (check == 100'000 or check == 100'110)
+                                      return activity::HALT;
+                                    else
+                                      return activity::PASS;
+                                  })};
+          
+          CHECK (0 == wof.size());
+          
+          wof.incScale();
+          wof.incScale();
+          wof.incScale();
+          sleep_for(10us);         // this may be fragile; must be sufficiently short
+          
+          CHECK (3 == wof.size());
+          
+          sleep_for(50ms);
+          CHECK (1 == wof.size());
         }
       
       
diff --git a/wiki/thinkPad.ichthyo.mm b/wiki/thinkPad.ichthyo.mm
index ff784a104..aab11cec5 100644
--- a/wiki/thinkPad.ichthyo.mm
+++ b/wiki/thinkPad.ichthyo.mm
@@ -80041,8 +80041,8 @@ Date:&#160;&#160;&#160;Thu Apr 20 18:53:17 2023 +0200<br/>
 <node COLOR="#338800" CREATED="1694098758090" ID="ID_1594595049" MODIFIED="1694174633952" TEXT="verify_pullWork: f&#xfc;hrt den Work-Funktor wiederholt aus">
 <icon BUILTIN="button_ok"/>
 </node>
-<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1694098814770" ID="ID_495507864" MODIFIED="1694099559955" TEXT="verify_workerHalt: terminiert auf Anweisung">
-<icon BUILTIN="flag-yellow"/>
+<node COLOR="#338800" CREATED="1694098814770" ID="ID_495507864" MODIFIED="1694175245569" TEXT="verify_workerHalt: terminiert auf Anweisung">
+<icon BUILTIN="button_ok"/>
 </node>
 <node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1694098789389" ID="ID_1077314922" MODIFIED="1694099559954" TEXT="verify_workerSleep: schl&#xe4;ft auf Anweisung">
 <icon BUILTIN="flag-yellow"/>
@@ -80069,8 +80069,12 @@ Date:&#160;&#160;&#160;Thu Apr 20 18:53:17 2023 +0200<br/>
 <node CREATED="1694099029004" ID="ID_910692339" MODIFIED="1694099041032" TEXT="skaliert auf genau N worker"/>
 <node CREATED="1694099061344" ID="ID_758198253" MODIFIED="1694099067644" TEXT="skaliert um einen Worker hoch"/>
 </node>
-<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1694099080950" ID="ID_542625093" MODIFIED="1694099566207" TEXT="verify_countActive: ermittelt Zahl aktiver Worker">
-<icon BUILTIN="flag-yellow"/>
+<node COLOR="#338800" CREATED="1694099080950" ID="ID_542625093" MODIFIED="1694176109416" TEXT="verify_countActive: ermittelt Zahl aktiver Worker">
+<icon BUILTIN="button_ok"/>
+<node CREATED="1694176125532" ID="ID_1861823619" MODIFIED="1694176149434" TEXT="lasse das work-&#x3bb; zweimal ein HALT zur&#xfc;ckgeben"/>
+<node CREATED="1694176110582" ID="ID_129912527" MODIFIED="1694176151624" TEXT="etwas fragil, da ich genau timen mu&#xdf;">
+<icon BUILTIN="messagebox_warning"/>
+</node>
 </node>
 <node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1694099160252" ID="ID_950338764" MODIFIED="1694099567838" TEXT="verify_dtor_blocks">
 <icon BUILTIN="flag-yellow"/>