Add word and line movement in vim normal mode

Add jump to start and end of the document
Move vim tests to relevant vim files
Rename VimTestAppContext to VimTestContext for brevity
Improve VimTestContext assertions to pretty print locations when selection position assertion panics

crates/vim/src/insert.rs

@@ -25,6 +25,23 @@ fn normal_before(_: &mut Workspace, _: &NormalBefore, cx: &mut ViewContext<Works
                 (map.clip_point(cursor, Bias::Left), SelectionGoal::None)
             });
         });
-        state.switch_mode(&SwitchMode(Mode::Normal), cx);
+        state.switch_mode(&SwitchMode(Mode::normal()), cx);
     })
 }
+
+#[cfg(test)]
+mod test {
+    use crate::{mode::Mode, vim_test_context::VimTestContext};
+
+    #[gpui::test]
+    async fn test_enter_and_exit_insert_mode(cx: &mut gpui::TestAppContext) {
+        let mut cx = VimTestContext::new(cx, true, "").await;
+        cx.simulate_keystroke("i");
+        assert_eq!(cx.mode(), Mode::Insert);
+        cx.simulate_keystrokes(&["T", "e", "s", "t"]);
+        cx.assert_editor_state("Test|");
+        cx.simulate_keystroke("escape");
+        assert_eq!(cx.mode(), Mode::normal());
+        cx.assert_editor_state("Tes|t");
+    }
+}