diff --git a/src/lib/split-splice.hpp b/src/lib/split-splice.hpp
index 0386cd319..4cdedbddb 100644
--- a/src/lib/split-splice.hpp
+++ b/src/lib/split-splice.hpp
@@ -70,9 +70,10 @@
  **   values until matching the end of the preceding segment
  ** - if both values are omitted, the new segment will replace the last segment of the given axis.
  ** The new segment may span an arbitrary range within the domain and may thus possibly supersede
- ** several existing segments, which are then removed by the `DELETE` operation.  
+ ** several existing segments, which are then removed by the `DELETE` operation.
  ** 
- ** @todo 2023 WIP
+ ** @see SplitSplice_test
+ ** @see steam::fixture::Segmentation::splitSplice
  */
 
 
@@ -335,9 +336,6 @@ namespace lib {
           }
       };
     
-  }//(End) namespace splitsplace
-  
-  
-  
+  }//namespace splitsplace
 } // namespace lib
 #endif /*LIB_SPLIT_SPLICE_H*/
diff --git a/tests/15library.tests b/tests/15library.tests
index 32285b56a..86d3c59ae 100644
--- a/tests/15library.tests
+++ b/tests/15library.tests
@@ -585,7 +585,7 @@ return: 0
 END
 
 
-PLANNED "Split/Splice segmentation" SplitSplice_test  <<END
+TEST "Split/Splice segmentation" SplitSplice_test  <<END
 return: 0
 END
 
diff --git a/tests/library/split-splice-test.cpp b/tests/library/split-splice-test.cpp
index 046c11133..717fa9b5e 100644
--- a/tests/library/split-splice-test.cpp
+++ b/tests/library/split-splice-test.cpp
@@ -225,7 +225,7 @@ namespace test {
      * Perform the »SplitSplice« Algorithm to splice a new Segment
      * into the given [segmentation of the integer-axis](\ref SegL).
      * A local λ-binding is setup to define the basic operations
-     * required by the Algo implementation to work with this
+     * required by the algorithm implementation to work with this
      * specific kind of data.
      * @return Tuple `(s,n,e)` to indicate where changes happened
      *   - s the first changed element
@@ -388,9 +388,10 @@ namespace test {
                               CHECK (segmentation == expectedResult);
                               CHECK (segmentation.isValid());
                             };
-          
+                                                             ////////
           testCase (SegL{}, -23,24,              "├[-100~-23[[-23_24[[24~100[┤"_expect);            // simple segment into empty axis
           
+          // insert smaller segment
           testCase (SegL{5,10},  2,3,                 "├[-100~2[[2_3[[3~5[[5_10[[10~100[┤"_expect); // smaller segment left spaced off
           testCase (SegL{5,10},  4,5,                 "├[-100~4[[4_5[[5_10[[10~100[┤"_expect);      // left adjacent
           testCase (SegL{5,10},  4,8,                 "├[-100~4[[4_8[[8_10[[10~100[┤"_expect);      // left overlapping
@@ -401,12 +402,15 @@ namespace test {
           testCase (SegL{5,10}, 10,13,        "├[-100~5[[5_10[[10_13[[13~100[┤"_expect);            // right adjacent
           testCase (SegL{5,10}, 13,23, "├[-100~5[[5_10[[10~13[[13_23[[23~100[┤"_expect);            // right spaced off
           
+          // insert identical segment
           testCase (SegL{5,10},  5,10,               "├[-100~5[[5_10[[10~100[┤"_expect);            // identical size replacement
           
+          // insert larger segment
           testCase (SegL{5,10},  3,10,               "├[-100~3[[3_10[[10~100[┤"_expect);            // larger segment right aligned
           testCase (SegL{5,10},  3,23,               "├[-100~3[[3_23[[23~100[┤"_expect);            // larger segment overarching
           testCase (SegL{5,10},  5,23,               "├[-100~5[[5_23[[23~100[┤"_expect);            // larger segment left aligned
-        }
+        }                                                      //////
+      
       
       
       /**
@@ -415,8 +419,50 @@ namespace test {
       void
       verify_cornerCases()
         {
-          UNIMPLEMENTED ("corner cases");
-        }
+          auto testCase = [](SegL segmentation
+                            ,OptInt startNew           // Note: these are optional...
+                            ,OptInt afterNew
+                            ,ExpectString expectedResult)
+                            {
+                              invokeSplitSplice (segmentation, startNew, afterNew);
+                              CHECK (segmentation == expectedResult);
+                              CHECK (segmentation.isValid());
+                            };
+          auto x = std::nullopt;
+                                                       //////
+          testCase (SegL{}, 3,2,              "├[-100~2[[2_3[[3~100[┤"_expect);           // flipped interval spec is reoriented
+                                                       //////
+          testCase (SegL{}, 3,x,            "├[-100~3[[3_100[┤"_expect);                  // expanded until domain end
+          testCase (SegL{}, x,5,                   "├[-100_5[[5~100[┤"_expect);           // expanded to start of domain
+                                                        /////
+          testCase (SegL{4,6}, 5,x,      "├[-100~4[[4_5[[5_6[[6~100[┤"_expect);           // expanded until end of enclosing segment
+          testCase (SegL{4,6}, x,5,           "├[-100~4[[4_5[[5_6[[6~100[┤"_expect);      // expanded to start of enclosing segment
+                                                        /////
+          testCase (SegL{4,6}, 3,x,           "├[-100~3[[3_4[[4_6[[6~100[┤"_expect);      // expanded to fill gap to next segment
+          testCase (SegL{4,6}, x,3,                "├[-100_3[[3~4[[4_6[[6~100[┤"_expect); // expanded to cover predecessor completely
+          testCase (SegL{4,6}, 4,x,           "├[-100~4[[4_6[[6~100[┤"_expect);           // expanded to cover (replace) successor
+          testCase (SegL{4,6}, x,4,           "├[-100_4[[4_6[[6~100[┤"_expect);           // expanded to cover (replace) predecessor
+                                                        /////
+          testCase (SegL{4,6}, 7,x, "├[-100~4[[4_6[[6~7[[7_100[┤"_expect);                // shorten successor and expand new segment to end of successor (=domain end)
+          testCase (SegL{4,6}, x,7,      "├[-100~4[[4_6[[6_7[[7~100[┤"_expect);           // fill gap between predecessor and given new segment end
+          testCase (SegL{4,6}, 6,x,      "├[-100~4[[4_6[[6_100[┤"_expect);                // expand to cover (replace) the following segment until domain end
+          testCase (SegL{4,6}, x,6,           "├[-100~4[[4_6[[6~100[┤"_expect);           // expanded to cover (replace) the preceding segment
+                                                        /////
+          testCase (SegL{},    x,x,                "├[-100_100[┤"_expect);                // without any specification, the whole domain is covered
+          testCase (SegL{4},   x,x,           "├[-100~4[[4_100[┤"_expect);                // otherwise, without any spec the last segment is replaced
+          testCase (SegL{4,6}, x,x,      "├[-100~4[[4_6[[6_100[┤"_expect);
+                                                        /////
+          testCase (SegL{4,5,6,8}, 3,6,       "├[-100~3[[3_6[[6_8[[8~100[┤"_expect);      // spanning and thus replacing multiple segments
+          testCase (SegL{4,5,6,8}, 4,6,       "├[-100~4[[4_6[[6_8[[8~100[┤"_expect);
+          testCase (SegL{4,5,6,8}, 4,7,       "├[-100~4[[4_7[[7_8[[8~100[┤"_expect);
+          testCase (SegL{4,5,6,8}, 3,7,       "├[-100~3[[3_7[[7_8[[8~100[┤"_expect);
+          testCase (SegL{4,5,6,8}, 3,8,       "├[-100~3[[3_8[[8~100[┤"_expect);
+          testCase (SegL{4,5,6,8}, 4,8,       "├[-100~4[[4_8[[8~100[┤"_expect);
+          testCase (SegL{4,5,6,8}, 4,9,       "├[-100~4[[4_9[[9~100[┤"_expect);
+          testCase (SegL{4,5,6,8}, 5,9,  "├[-100~4[[4_5[[5_9[[9~100[┤"_expect);
+          testCase (SegL{4,5,6,8}, 5,x,  "├[-100~4[[4_5[[5_6[[6_8[[8~100[┤"_expect);
+          testCase (SegL{4,5,7,8}, x,6,  "├[-100~4[[4_5[[5_6[[6_7[[7_8[[8~100[┤"_expect);
+        }                                               /////
     };
   
   LAUNCHER (SplitSplice_test, "unit common");
diff --git a/wiki/thinkPad.ichthyo.mm b/wiki/thinkPad.ichthyo.mm
index cddf906ea..2969c4bce 100644
--- a/wiki/thinkPad.ichthyo.mm
+++ b/wiki/thinkPad.ichthyo.mm
@@ -70278,9 +70278,9 @@
 </html></richcontent>
 <icon BUILTIN="button_ok"/>
 </node>
-<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1683046958233" ID="ID_226373762" MODIFIED="1683047000567" TEXT="isoliert testbar machen">
-<arrowlink COLOR="#e31dc4" DESTINATION="ID_1714211009" ENDARROW="Default" ENDINCLINATION="-141;9;" ID="Arrow_ID_816334190" STARTARROW="None" STARTINCLINATION="-192;20;"/>
-<icon BUILTIN="flag-yellow"/>
+<node COLOR="#338800" CREATED="1683046958233" ID="ID_226373762" MODIFIED="1683208595655" TEXT="isoliert testbar machen">
+<arrowlink COLOR="#2ec3d8" DESTINATION="ID_1714211009" ENDARROW="Default" ENDINCLINATION="-141;9;" ID="Arrow_ID_816334190" STARTARROW="None" STARTINCLINATION="-192;20;"/>
+<icon BUILTIN="button_ok"/>
 <node COLOR="#338800" CREATED="1683158281268" ID="ID_1471352554" MODIFIED="1683158303513" TEXT="Verdrahtung f&#xfc;r Dummy-Integer-Segmente">
 <icon BUILTIN="button_ok"/>
 </node>
@@ -70309,15 +70309,15 @@
 </node>
 </node>
 </node>
-<node BACKGROUND_COLOR="#d2beaf" COLOR="#5c4d6e" CREATED="1682993091685" ID="ID_988617455" MODIFIED="1682993099148" TEXT="systematische Testabdeckung">
-<icon BUILTIN="hourglass"/>
+<node BACKGROUND_COLOR="#eef0c5" COLOR="#990000" CREATED="1682993091685" ID="ID_988617455" MODIFIED="1683208612560" TEXT="systematische Testabdeckung">
+<icon BUILTIN="pencil"/>
 <node CREATED="1682993100755" ID="ID_1651031348" MODIFIED="1682993128370" TEXT="es sind 12 Basis-F&#xe4;lle">
 <icon BUILTIN="info"/>
 </node>
 <node CREATED="1682993108314" ID="ID_317827435" MODIFIED="1682993122827" TEXT="hinzu kommt die Variante, da&#xdf; leere Intervalle zusammengef&#xfc;hrt werden"/>
-<node BACKGROUND_COLOR="#eef0c5" COLOR="#990000" CREATED="1683046966788" ID="ID_1714211009" MODIFIED="1683120265331" TEXT="splitSplice-Algo isoliert testen">
-<linktarget COLOR="#e31dc4" DESTINATION="ID_1714211009" ENDARROW="Default" ENDINCLINATION="-141;9;" ID="Arrow_ID_816334190" SOURCE="ID_226373762" STARTARROW="None" STARTINCLINATION="-192;20;"/>
-<icon BUILTIN="pencil"/>
+<node COLOR="#338800" CREATED="1683046966788" ID="ID_1714211009" MODIFIED="1683208598606" TEXT="splitSplice-Algo isoliert testen">
+<linktarget COLOR="#2ec3d8" DESTINATION="ID_1714211009" ENDARROW="Default" ENDINCLINATION="-141;9;" ID="Arrow_ID_816334190" SOURCE="ID_226373762" STARTARROW="None" STARTINCLINATION="-192;20;"/>
+<icon BUILTIN="button_ok"/>
 <node COLOR="#338800" CREATED="1683120139366" ID="ID_255513798" MODIFIED="1683120148509" TEXT="Test-Setup mit einfachen int-Intevallen">
 <icon BUILTIN="button_ok"/>
 </node>
@@ -70346,11 +70346,14 @@
 <icon BUILTIN="ksmiletris"/>
 </node>
 </node>
-<node BACKGROUND_COLOR="#eef0c5" COLOR="#990000" CREATED="1683158382175" ID="ID_1213737514" MODIFIED="1683199886418" TEXT="Setup f&#xfc;r Einzelfall-Tests">
-<icon BUILTIN="pencil"/>
+<node COLOR="#338800" CREATED="1683158382175" ID="ID_1213737514" MODIFIED="1683208577001" TEXT="Setup f&#xfc;r Einzelfall-Tests">
+<icon BUILTIN="button_ok"/>
 <node COLOR="#338800" CREATED="1683199848866" ID="ID_890601228" MODIFIED="1683199875667" TEXT="voll definierte Bouds">
 <icon BUILTIN="button_ok"/>
 </node>
+<node COLOR="#338800" CREATED="1683208568957" ID="ID_1505138970" MODIFIED="1683208575478" TEXT="partiell definierte Bounds">
+<icon BUILTIN="button_ok"/>
+</node>
 </node>
 <node COLOR="#338800" CREATED="1683047015402" ID="ID_1729864005" MODIFIED="1683203798608" TEXT="M&#xf6;gliche Intervall-Anordnungen">
 <icon BUILTIN="button_ok"/>
@@ -70453,34 +70456,55 @@
 </node>
 </node>
 </node>
-<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1683047063010" ID="ID_1521759912" MODIFIED="1683047144754" TEXT="degenerierte F&#xe4;lle">
-<icon BUILTIN="flag-yellow"/>
-<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1683047111300" ID="ID_592313563" MODIFIED="1683047141649" TEXT="Ende vor Start &#x27f9; flip">
-<icon BUILTIN="flag-yellow"/>
+<node COLOR="#338800" CREATED="1683047063010" ID="ID_1521759912" MODIFIED="1683208562370" TEXT="degenerierte F&#xe4;lle">
+<icon BUILTIN="button_ok"/>
+<node COLOR="#338800" CREATED="1683047111300" ID="ID_592313563" MODIFIED="1683204557100" TEXT="Ende vor Start &#x27f9; flip">
+<icon BUILTIN="button_ok"/>
 </node>
-<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1683047568998" ID="ID_717909997" MODIFIED="1683047593595" TEXT="nur Start in leer">
-<icon BUILTIN="flag-yellow"/>
+<node COLOR="#338800" CREATED="1683047568998" ID="ID_717909997" MODIFIED="1683204814732" TEXT="nur Start in leer">
+<icon BUILTIN="button_ok"/>
 </node>
-<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1683047600842" ID="ID_1296939767" MODIFIED="1683047604778" TEXT="nur Ende in leer">
-<icon BUILTIN="flag-yellow"/>
+<node COLOR="#338800" CREATED="1683047600842" ID="ID_1296939767" MODIFIED="1683204815920" TEXT="nur Ende in leer">
+<icon BUILTIN="button_ok"/>
 </node>
-<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1683047624559" ID="ID_1509703991" MODIFIED="1683047708973" TEXT="nur Start in Seg">
-<icon BUILTIN="flag-yellow"/>
+<node COLOR="#338800" CREATED="1683047624559" ID="ID_1509703991" MODIFIED="1683205236476" TEXT="nur Start in Seg">
+<icon BUILTIN="button_ok"/>
 </node>
-<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1683047654979" ID="ID_1521058039" MODIFIED="1683047708973" TEXT="nur Ende in Seg">
-<icon BUILTIN="flag-yellow"/>
+<node COLOR="#338800" CREATED="1683047654979" ID="ID_1521058039" MODIFIED="1683205236475" TEXT="nur Ende in Seg">
+<icon BUILTIN="button_ok"/>
 </node>
-<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1683047688030" ID="ID_1363163343" MODIFIED="1683047708974" TEXT="nur Start vor Seg">
-<icon BUILTIN="flag-yellow"/>
+<node COLOR="#338800" CREATED="1683047688030" ID="ID_1363163343" MODIFIED="1683205615492" TEXT="nur Start vor Seg">
+<icon BUILTIN="button_ok"/>
 </node>
-<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1683047693102" ID="ID_848292031" MODIFIED="1683047708974" TEXT="nur Ende vor Seg">
-<icon BUILTIN="flag-yellow"/>
+<node COLOR="#338800" CREATED="1683047693102" ID="ID_848292031" MODIFIED="1683205615492" TEXT="nur Ende vor Seg">
+<icon BUILTIN="button_ok"/>
 </node>
-<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1683047697837" ID="ID_1072007349" MODIFIED="1683047708975" TEXT="nur Start nach Seg">
-<icon BUILTIN="flag-yellow"/>
+<node COLOR="#338800" CREATED="1683047688030" ID="ID_1243727539" MODIFIED="1683205615493" TEXT="nur Start vor Seg b&#xfc;ndig">
+<icon BUILTIN="button_ok"/>
 </node>
-<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1683047704284" ID="ID_695991119" MODIFIED="1683047708975" TEXT="nur Ende nach Seg">
-<icon BUILTIN="flag-yellow"/>
+<node COLOR="#338800" CREATED="1683047693102" ID="ID_1566033672" MODIFIED="1683205615493" TEXT="nur Ende vor Seg b&#xfc;ndig">
+<icon BUILTIN="button_ok"/>
+</node>
+<node COLOR="#338800" CREATED="1683047697837" ID="ID_1072007349" MODIFIED="1683205991794" TEXT="nur Start nach Seg">
+<icon BUILTIN="button_ok"/>
+</node>
+<node COLOR="#338800" CREATED="1683047704284" ID="ID_695991119" MODIFIED="1683205991794" TEXT="nur Ende nach Seg">
+<icon BUILTIN="button_ok"/>
+</node>
+<node COLOR="#338800" CREATED="1683047688030" ID="ID_338317609" MODIFIED="1683205991795" TEXT="nur Start nach Seg b&#xfc;ndig">
+<icon BUILTIN="button_ok"/>
+</node>
+<node COLOR="#338800" CREATED="1683047693102" ID="ID_1890127575" MODIFIED="1683205991795" TEXT="nur Ende nach Seg b&#xfc;ndig">
+<icon BUILTIN="button_ok"/>
+</node>
+<node COLOR="#338800" CREATED="1683207052920" ID="ID_1558440128" MODIFIED="1683207476505" TEXT="keine Angabe in leer">
+<icon BUILTIN="button_ok"/>
+</node>
+<node COLOR="#338800" CREATED="1683207078324" ID="ID_1025210162" MODIFIED="1683207476505" TEXT="keine Angabe + bestehendes Segment">
+<icon BUILTIN="button_ok"/>
+</node>
+<node COLOR="#338800" CREATED="1683207090858" ID="ID_149796036" MODIFIED="1683207476506" TEXT="keine Angabe + bestehendes Segment b&#xfc;ndig zum Ende">
+<icon BUILTIN="button_ok"/>
 </node>
 </node>
 </node>