Add another test for undo

test/transforms/fixtures/on-history/undo/delete-text-across-block/index.js

@@ -0,0 +1,24 @@
+
+import assert from 'assert'
+
+export default function (state) {
+  const { selection } = state
+  const range = selection.merge({
+    anchorKey: 'key1',
+    anchorOffset: 1,
+    focusKey: 'key2',
+    focusOffset: 3
+  })
+
+  const next = state
+    .transform()
+    .deleteAtRange(range)
+    .apply()
+
+    .transform()
+    .undo()
+    .apply()
+
+  assert.deepEqual(next.selection.toJS(), selection.toJS())
+  return next
+}

test/transforms/fixtures/on-history/undo/delete-text-across-block/input.yaml

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+
+nodes:
+  - kind: block
+    type: paragraph
+    nodes:
+      - kind: text
+        key: 'key1'
+        text: The
+  - kind: block
+    type: paragraph
+    nodes:
+      - kind: text
+        key: 'key2'
+        text: text

test/transforms/fixtures/on-history/undo/delete-text-across-block/output.yaml

@@ -0,0 +1,14 @@
+
+nodes:
+  - kind: block
+    key: 'key1'
+    type: paragraph
+    nodes:
+      - kind: text
+        text: The
+  - kind: block
+    key: 'key2'
+    type: paragraph
+    nodes:
+      - kind: text
+        text: text