amend tests for vi's 'j' motion, after having reimplemented it

test/normal-move.sml

@@ -260,9 +260,7 @@ struct
            in
              Expect.isTrue c1
            end)
-    , test
+    , test "when next newline is preceded by char, goes to idx after newline"
-        "goes to first newline when there are two consecutive newlines\
-         \ahead of the cursor"
         (fn _ =>
            let
              (* arrange *)
@@ -270,11 +268,9 @@ struct
 
              (* act *)
              val {cursorIdx, ...} = TestUtils.update (app, CHAR_EVENT #"j")
-
-             (* assert *)
-             val isSkipped = cursorIdx = 5
            in
-             Expect.isTrue isSkipped
+             (* assert *)
+             Expect.isTrue (cursorIdx = 6)
            end)
     , test "moves to same column on last line after a count" (fn _ =>
         let
@@ -344,15 +340,12 @@ struct
         in
           Expect.isTrue isAtEnd
         end)
-    , test
+    , test "goes to next idx when cursor is on a newline" (fn _ =>
-        "goes to next char when cursor is on a newline \
-        \and next char is not a newline"
-        (fn _ =>
         let
           (* arrange *)
           val str = "hello\n\nworld\n"
           val app = TestUtils.init str
-             val app = AppWith.idx (app, 5)
+          val app = AppWith.idx (app, 6)
 
           (* act *)
           val {cursorIdx, ...} = TestUtils.update (app, CHAR_EVENT #"j")