diff --git a/src/vault/gear/activity.hpp b/src/vault/gear/activity.hpp
index be4c4bd93..ef1c07e77 100644
--- a/src/vault/gear/activity.hpp
+++ b/src/vault/gear/activity.hpp
@@ -154,12 +154,10 @@ namespace gear {
                        "Execution-Context: " STRINGIFY(_FUN_) " expect function with signature: " STRINGIFY(_SIG_));
       
       
-       EXE const& ctx = std::declval<EXE>();
-      
-       ASSERT_MEMBER_FUNCTOR (ctx.post, Proc(Activity&, EXE&, Time));
-       ASSERT_MEMBER_FUNCTOR (ctx.work, void(Time, size_t));
-       ASSERT_MEMBER_FUNCTOR (ctx.done, void(Time, size_t));
-       ASSERT_MEMBER_FUNCTOR (ctx.tick, Proc(Time));
+       ASSERT_MEMBER_FUNCTOR (EXE::post, Proc(Activity&, EXE&, Time));
+       ASSERT_MEMBER_FUNCTOR (EXE::work, void(Time, size_t));
+       ASSERT_MEMBER_FUNCTOR (EXE::done, void(Time, size_t));
+       ASSERT_MEMBER_FUNCTOR (EXE::tick, Proc(Time));
 
       
 #undef ASSERT_MEMBER_FUNCTOR
diff --git a/tests/vault/gear/activity-detector-test.cpp b/tests/vault/gear/activity-detector-test.cpp
index 0ef03f51b..2066450e3 100644
--- a/tests/vault/gear/activity-detector-test.cpp
+++ b/tests/vault/gear/activity-detector-test.cpp
@@ -69,6 +69,7 @@ namespace test {
           
           verifyMockInvocation();
           verifyMockJobFunctor();
+          verifyFakeExeContext();
           detect_activation();
           detect_gate();
         }
@@ -179,8 +180,26 @@ namespace test {
       
       
       
+      /** @test faked execution context to perform Activity activation
+       * @todo WIP 8/23 🔁 define ⟶ implement
+       */
+      void
+      verifyFakeExeContext()
+        {
+          ActivityDetector detector;
+          auto& ctx = detector.executionCtx;
+          // an otherwise opaque object fulfilling the "Concept"
+          activity::_verify_usable_as_ExecutionContext<decltype(detector.executionCtx)>();
+          
+          Time t = lib::test::randTime();
+          
+          CHECK (activity::PASS == ctx.tick(t));
+          cout<<detector.showLog()<<endl;
+        }
+      
+      
       /** @test TODO diagnostic setup to detect Activity activation and propagation
-       * @todo WIP 7/23 ⟶ define ⟶ implement
+       * @todo WIP 8/23 🔁 define ⟶ implement
        */
       void
       detect_activation()
diff --git a/tests/vault/gear/activity-detector.hpp b/tests/vault/gear/activity-detector.hpp
index 0a286d424..0f2a1b4ed 100644
--- a/tests/vault/gear/activity-detector.hpp
+++ b/tests/vault/gear/activity-detector.hpp
@@ -124,6 +124,11 @@ namespace test {
     
     using SIG_JobDiagnostic = void(TimeValue, int32_t);
     const size_t JOB_ARG_POS_TIME = 0;
+    
+    const string CTX_POST{"post"};
+    const string CTX_WORK{"work"};
+    const string CTX_DONE{"done"};
+    const string CTX_TICK{"tick"};
   }
   
   class ActivityDetector;
@@ -282,7 +287,7 @@ namespace test {
           
           /** mock function call operator: logs all invocations */
           RET
-          operator() (ARGS const& ...args)
+          operator() (ARGS ...args)
             {
               log_->call (log_->getID(), id_, args...)
                    .addAttrib (MARK_SEQ, util::toString(*seqNr_));
@@ -401,6 +406,39 @@ namespace test {
         }
       
       
+      
+      struct FakeExecutionCtx;
+      using SIG_post = activity::Proc(Activity&, FakeExecutionCtx&, Time);
+      using SIG_work = void(Time, size_t);
+      using SIG_done = void(Time, size_t);
+      using SIG_tick = activity::Proc(Time);
+      
+      /**
+       * Mock setup of the execution context for Activity activation.
+       * The instance #executionCtx is wired back with the #eventLog_
+       * and allows thus to detect and verify all callbacks from the Activities.
+       * @note the return value of the #post and #tick functions can be changed
+       *       to another fixed response by calling DiagnosticFun::returning
+       */
+      struct FakeExecutionCtx
+        {
+          _DiagnosticFun<SIG_post>::Type post;
+          _DiagnosticFun<SIG_work>::Type work;
+          _DiagnosticFun<SIG_done>::Type done;
+          _DiagnosticFun<SIG_tick>::Type tick;
+          
+          FakeExecutionCtx (ActivityDetector& adi)
+            : post{adi.buildDiagnosticFun<SIG_post>(CTX_POST).returning(activity::PASS)}
+            , work{adi.buildDiagnosticFun<SIG_work>(CTX_WORK)}
+            , done{adi.buildDiagnosticFun<SIG_done>(CTX_DONE)}
+            , tick{adi.buildDiagnosticFun<SIG_tick>(CTX_TICK).returning(activity::PASS)}
+            { }
+        };
+      
+      FakeExecutionCtx executionCtx{*this};
+      
+      
+      
       ActivityMatch
       verifyInvocation (string fun)
         {
diff --git a/tests/vault/gear/scheduler-activity-test.cpp b/tests/vault/gear/scheduler-activity-test.cpp
index dc36046e9..94ab20e0a 100644
--- a/tests/vault/gear/scheduler-activity-test.cpp
+++ b/tests/vault/gear/scheduler-activity-test.cpp
@@ -26,6 +26,7 @@
 
 
 #include "lib/test/run.hpp"
+#include "activity-detector.hpp"
 #include "vault/gear/activity-lang.hpp"
 #include "lib/time/timevalue.hpp"
 //#include "lib/format-cout.hpp"
@@ -78,7 +79,7 @@ namespace test {
       
       
       /** @test TODO demonstrate a simple usage scenario
-       * @todo WIP 7/23 ⟶ define ⟶ implement
+       * @todo WIP 7/23 🔁 define 🔁 implement
        */
       void
       simpleUsage()
@@ -94,11 +95,12 @@ namespace test {
       
       
       /** @test TODO behaviour of Activity::INVOKE
-       * @todo WIP 7/23 ⟶ define ⟶ implement
+       * @todo WIP 7/23 🔁 define ⟶ implement
        */
       void
       verifyActivity_Invoke()
         {
+          ActivityDetector detector;
         }
       
       
diff --git a/wiki/thinkPad.ichthyo.mm b/wiki/thinkPad.ichthyo.mm
index 13ec52e55..3623af93c 100644
--- a/wiki/thinkPad.ichthyo.mm
+++ b/wiki/thinkPad.ichthyo.mm
@@ -78454,7 +78454,13 @@ Date:&#160;&#160;&#160;Thu Apr 20 18:53:17 2023 +0200<br/>
 <icon BUILTIN="button_ok"/>
 </node>
 </node>
-<node CREATED="1690068793535" ID="ID_1906823317" MODIFIED="1690068819476" TEXT="ist implementiert durch die ActivityLang selber"/>
+<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1690068793535" ID="ID_1906823317" MODIFIED="1692286273670" TEXT="ist implementiert durch die ActivityLang selber">
+<icon BUILTIN="flag-yellow"/>
+</node>
+<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1692286145852" ID="ID_596906210" MODIFIED="1692286248899" TEXT="Fake-Setup f&#xfc;r Tests (ActivityDetector)">
+<arrowlink COLOR="#433d62" DESTINATION="ID_902152915" ENDARROW="Default" ENDINCLINATION="656;-38;" ID="Arrow_ID_644734597" STARTARROW="None" STARTINCLINATION="1154;77;"/>
+<icon BUILTIN="flag-yellow"/>
+</node>
 </node>
 </node>
 <node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1690068830605" ID="ID_330404913" MODIFIED="1690068833053" TEXT="Invocation">
@@ -79425,10 +79431,14 @@ Date:&#160;&#160;&#160;Thu Apr 20 18:53:17 2023 +0200<br/>
 <node CREATED="1689201354393" HGAP="24" ID="ID_1250518280" MODIFIED="1689201365333" TEXT="Hilfsmittel" VSHIFT="2">
 <node BACKGROUND_COLOR="#eef0c5" COLOR="#990000" CREATED="1689201660559" ID="ID_747497995" MODIFIED="1692057369715" TEXT="ActivityDetector">
 <icon BUILTIN="pencil"/>
-<node CREATED="1689201667734" ID="ID_901153159" MODIFIED="1689201676495" TEXT="speziell verdrahtete Activity">
+<node CREATED="1689201667734" ID="ID_901153159" MODIFIED="1692286015665" TEXT="speziell verdrahtetes Setup">
 <icon BUILTIN="info"/>
 <node CREATED="1689201677836" ID="ID_166879509" MODIFIED="1689201693231" TEXT="kann ihre Aktivierung dokumentieren"/>
 <node CREATED="1689201999161" ID="ID_554259263" MODIFIED="1689202008524" TEXT="kann Gate-Verhalten aufzeichnen"/>
+<node CREATED="1692286019936" ID="ID_902152915" MODIFIED="1692286702295" TEXT="bietet ExecutionContext-Fake">
+<arrowlink COLOR="#7d5f6b" DESTINATION="ID_1648694746" ENDARROW="Default" ENDINCLINATION="-155;-594;" ID="Arrow_ID_1288986872" STARTARROW="None" STARTINCLINATION="668;64;"/>
+<linktarget COLOR="#433d62" DESTINATION="ID_902152915" ENDARROW="Default" ENDINCLINATION="656;-38;" ID="Arrow_ID_644734597" SOURCE="ID_596906210" STARTARROW="None" STARTINCLINATION="1154;77;"/>
+</node>
 </node>
 <node BACKGROUND_COLOR="#fdfdcf" COLOR="#ff0000" CREATED="1689202062345" ID="ID_373470992" MODIFIED="1692057818268" TEXT="implementiert als eigenst&#xe4;ndiges Test-Hilfsmittel">
 <richcontent TYPE="NOTE"><html>
@@ -82030,6 +82040,23 @@ Date:&#160;&#160;&#160;Thu Apr 20 18:53:17 2023 +0200<br/>
 </node>
 </node>
 </node>
+<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1692286331547" ID="ID_1648694746" MODIFIED="1692286680929" TEXT="FakeExecutionCtx bereitstellen">
+<linktarget COLOR="#7d5f6b" DESTINATION="ID_1648694746" ENDARROW="Default" ENDINCLINATION="-155;-594;" ID="Arrow_ID_1288986872" SOURCE="ID_902152915" STARTARROW="None" STARTINCLINATION="668;64;"/>
+<icon BUILTIN="flag-yellow"/>
+<node BACKGROUND_COLOR="#eef0c5" COLOR="#990000" CREATED="1692286350353" ID="ID_592111396" MODIFIED="1692293651780" TEXT="bietet die notwendingen &#x3bb;-Bindings">
+<icon BUILTIN="pencil"/>
+<node CREATED="1690069222750" ID="ID_1750846288" MODIFIED="1692293582767" TEXT="&#x3bb;-post: (Activity, ExecutionCtx, Time) activity::Proc  &#x27fc; activity::Proc"/>
+<node CREATED="1690069365933" ID="ID_832098393" MODIFIED="1692286755765" TEXT="&#x3bb;-work: (Time, quality)"/>
+<node CREATED="1690069480630" ID="ID_320780008" MODIFIED="1692286762564" TEXT="&#x3bb;-done: (Time, quality)"/>
+<node CREATED="1690069554609" ID="ID_761100089" MODIFIED="1692286770500" TEXT="&#x3bb;-tick: (Time)  &#x27fc; activity::Proc"/>
+</node>
+<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1692286383148" ID="ID_675137089" MODIFIED="1692286389285" TEXT="diese sind per Log verifizierbar">
+<icon BUILTIN="flag-yellow"/>
+</node>
+<node COLOR="#338800" CREATED="1692286398114" ID="ID_482490572" MODIFIED="1692293638298" TEXT="pr&#xe4;parierte R&#xfc;ckgabewerte">
+<icon BUILTIN="button_ok"/>
+</node>
+</node>
 </node>
 </node>
 <node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1689205081622" ID="ID_1440811513" MODIFIED="1689205086027" TEXT="Me&#xdf;punkte">