Merge commit '7c621da28f07e449ad90c387344f07a453927569' as 'tcllib'

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diff --git a/tcllib/modules/struct/graph/tests/arc/move.test b/tcllib/modules/struct/graph/tests/arc/move.test
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+# -*- tcl -*-
+# Graph tests - arc move
+# Copyright (c) 2006 Andreas Kupries <andreas_kupries@users.sourceforge.net>
+# All rights reserved.
+# RCS: @(#) $Id: move.test,v 1.2 2007/04/12 03:01:55 andreas_kupries Exp $
+
+# Syntax: graph arc move ARC NEW-SOURCE NEW-TARGET
+
+# -------------------------------------------------------------------------
+# Wrong # args: Missing, Too many
+
+test graph-${impl}-${setimpl}-arc-move-1.0 {arc move, wrong#args, missing} {
+    SETUP
+    catch {mygraph arc move} res
+    mygraph destroy
+    set res
+} [tmWrong {arc move} {arc newsource newtarget} 0]
+
+test graph-${impl}-${setimpl}-arc-move-1.1 {arc move} {
+    SETUP
+    catch {mygraph arc move a} res
+    mygraph destroy
+    set res
+} [tmWrong {arc move} {arc newsource newtarget} 1]
+
+test graph-${impl}-${setimpl}-arc-move-1.2 {arc move} {
+    SETUP
+    catch {mygraph arc move a b} res
+    mygraph destroy
+    set res
+} [tmWrong {arc move} {arc newsource newtarget} 2]
+
+test graph-${impl}-${setimpl}-arc-move-1.3 {arc move} {
+    SETUP
+    catch {mygraph arc move a b c d} res
+    mygraph destroy
+    set res
+} [tmTooMany {arc move} {arc newsource newtarget}]
+
+# -------------------------------------------------------------------------
+# Logical arguments checks and failures
+
+test graph-${impl}-${setimpl}-arc-move-2.0 {arc move} {
+    SETUP
+    mygraph node insert 0 1
+    catch {mygraph arc move a 0 1} res
+    mygraph destroy
+    set res
+} [MissingArc $MY a]
+
+test graph-${impl}-${setimpl}-arc-move-2.1 {arc move} {
+    SETUP
+    mygraph node insert 0 1
+    mygraph arc  insert 0 1 a
+    catch {mygraph arc move a 0 2} res
+    mygraph destroy
+    set res
+} [MissingNode $MY 2]
+
+test graph-${impl}-${setimpl}-arc-move-2.2 {arc move} {
+    SETUP
+    mygraph node insert 0 1
+    mygraph arc  insert 0 1 a
+    catch {mygraph arc move a 2 0} res
+    mygraph destroy
+    set res
+} [MissingNode $MY 2]
+
+# -------------------------------------------------------------------------
+
+test graph-${impl}-${setimpl}-arc-move-3.0 {arc move, new source & target} {
+    SETUP
+    mygraph node insert 0 1 2 3
+    mygraph arc  insert 0 1 a
+    mygraph arc  move a 2 3
+    set res [list [mygraph arc source a] [mygraph arc target a]]
+    mygraph destroy
+    set res
+} {2 3}
+
+test graph-${impl}-${setimpl}-arc-move-3.1 {arc move, unchanged source, target} {
+    SETUP
+    mygraph node insert 0 1 2 3
+    mygraph arc  insert 0 1 a
+    mygraph arc  move a 0 1
+    set res [list [mygraph arc source a] [mygraph arc target a]]
+    mygraph destroy
+    set res
+} {0 1}
+
+test graph-${impl}-${setimpl}-arc-move-3.2 {arc move, unchanged source, changed target} {
+    SETUP
+    mygraph node insert 0 1 2 3
+    mygraph arc  insert 0 1 a
+    mygraph arc  move a 0 3
+    set res [list [mygraph arc source a] [mygraph arc target a]]
+    mygraph destroy
+    set res
+} {0 3}
+
+test graph-${impl}-${setimpl}-arc-move-3.3 {arc move, changed source, unchanged target} {
+    SETUP
+    mygraph node insert 0 1 2 3
+    mygraph arc  insert 0 1 a
+    mygraph arc  move a 2 1
+    set res [list [mygraph arc source a] [mygraph arc target a]]
+    mygraph destroy
+    set res
+} {2 1}
+
+# -------------------------------------------------------------------------