fix tests missing selection, unskip some tests

packages/slate-history/test/index.js

@@ -10,6 +10,7 @@ describe('slate-history', () => {
     run(editor)
     editor.exec({ type: 'undo' })
     assert.deepEqual(editor.children, output.children)
+    assert.deepEqual(editor.selection, output.selection)
   })
 })
 

packages/slate-history/test/undo/delete_backward/block-text.js

@@ -4,7 +4,7 @@ import { Editor } from 'slate'
 import { jsx } from '../..'
 
 export const run = editor => {
-  editor.delete()
+  Editor.delete(editor)
 }
 
 export const input = (
@@ -18,5 +18,3 @@ export const input = (
 )
 
 export const output = input
-
-export const skip = true

packages/slate-history/test/undo/delete_backward/custom-prop.js

@@ -4,7 +4,7 @@ import { Editor } from 'slate'
 import { jsx } from '../..'
 
 export const run = editor => {
-  editor.delete()
+  Editor.delete(editor)
 }
 
 export const input = (
@@ -21,5 +21,3 @@ export const input = (
 )
 
 export const output = input
-
-export const skip = true

packages/slate-history/test/undo/delete_backward/inline-across.js

@@ -4,7 +4,7 @@ import { Editor } from 'slate'
 import { jsx } from '../..'
 
 export const run = editor => {
-  editor.delete()
+  Editor.delete(editor)
 }
 
 export const input = (
@@ -29,5 +29,3 @@ export const input = (
 )
 
 export const output = input
-
-export const skip = true

packages/slate-history/test/undo/insert_fragment/basic.js

@@ -38,5 +38,3 @@ export const input = (
 )
 
 export const output = input
-
-export const skip = true

packages/slate-history/test/undo/insert_text/non-contiguous.js

@@ -1,12 +1,13 @@
 /** @jsx jsx */
 
+import { Editor } from 'slate'
 import { jsx } from '../..'
 
 export const run = editor => {
   editor.exec({ type: 'insert_text', text: 't' })
-  // editor.move({ reverse: true })
+  Editor.move(editor, { reverse: true })
   editor.exec({ type: 'insert_text', text: 'w' })
-  // editor.move({ reverse: true })
+  Editor.move(editor, { reverse: true })
   editor.exec({ type: 'insert_text', text: 'o' })
 }