add an additional test for 'dge' motion

temp.txt

@@ -1,2 +1 @@
-hello
+hello world again
-!world!again

test/normal-delete.sml

@@ -2290,7 +2290,7 @@ struct
     ]
 
   val dgeDelete = describe "delete motion 'dge'"
-    [test "does not delete when cursor is at start of file" (fn _ =>
+    [ test "does not delete when cursor is at start of file" (fn _ =>
         let
           (* arrange *)
           val originalString = "hello\n"
@@ -2307,7 +2307,72 @@ struct
         in
           Expect.isTrue
             (actualString = expectedString andalso cursorIdx = expectedCursorIdx)
-       end)]
+        end)
+    , test "deletes as expected when on second word and there are three words"
+        (fn _ =>
+           let
+             (* arrange *)
+             val originalString = "hello world again\n"
+
+             val app = TestUtils.init originalString
+
+             (* all the different positions the cursor can be
+              * on the second word *)
+             val app1 = AppWith.idx (app, 6)
+             val app2 = AppWith.idx (app, 7)
+             val app3 = AppWith.idx (app, 8)
+             val app4 = AppWith.idx (app, 9)
+             val app5 = AppWith.idx (app, 10)
+
+             (* act *)
+             val newApp1 = TestUtils.updateMany (app1, "dge")
+             val newApp2 = TestUtils.updateMany (app2, "dge")
+             val newApp3 = TestUtils.updateMany (app3, "dge")
+             val newApp4 = TestUtils.updateMany (app4, "dge")
+             val newApp5 = TestUtils.updateMany (app5, "dge")
+
+             (* assert *)
+             val expectedString1 = "hellorld again\n"
+             val expectedString2 = "hellrld again\n"
+             val expectedString3 = "hellld again\n"
+             val expectedString4 = "helld again\n"
+             val expectedString5 = "hell again\n"
+
+             val actualString1 = LineGap.toString (#buffer newApp1)
+             val actualString2 = LineGap.toString (#buffer newApp2)
+             val actualString3 = LineGap.toString (#buffer newApp3)
+             val actualString4 = LineGap.toString (#buffer newApp4)
+             val actualString5 = LineGap.toString (#buffer newApp5)
+
+             val stringsAreExpected =
+               expectedString1 = actualString1
+               andalso expectedString2 = actualString2
+               andalso expectedString3 = actualString3
+               andalso expectedString4 = actualString4
+               andalso expectedString5 = actualString5
+
+             val expectedCursor1 = 4
+             val expectedCursor2 = 4
+             val expectedCursor3 = 4
+             val expectedCursor4 = 4
+             val expectedCursor5 = 4
+
+             val actualCursor1 = #cursorIdx newApp1
+             val actualCursor2 = #cursorIdx newApp2
+             val actualCursor3 = #cursorIdx newApp3
+             val actualCursor4 = #cursorIdx newApp4
+             val actualCursor5 = #cursorIdx newApp5
+
+             val cursorsAreExpected =
+               expectedCursor1 = actualCursor1
+               andalso expectedCursor2 = actualCursor2
+               andalso expectedCursor3 = actualCursor3
+               andalso expectedCursor4 = actualCursor4
+               andalso expectedCursor5 = actualCursor5
+           in
+             Expect.isTrue (stringsAreExpected andalso cursorsAreExpected)
+           end)
+    ]
 
   val tests =
     [ dhDelete