Add unit test for undo of setNodeByKey

test/transforms/fixtures/on-history/undo/set-node-data/index.js

@@ -0,0 +1,17 @@
+
+export default function (state) {
+  const { document } = state
+
+  const next = state
+    .transform()
+    .setNodeByKey(document.nodes.first().key, {
+        data: { src: 'world.png' }
+    })
+    .apply()
+
+    .transform()
+    .undo()
+    .apply()
+
+  return next
+}

test/transforms/fixtures/on-history/undo/set-node-data/input.yaml

@@ -0,0 +1,7 @@
+
+nodes:
+  - kind: block
+    type: image
+    isVoid: true
+    data:
+      src: hello.png

test/transforms/fixtures/on-history/undo/set-node-data/output.yaml

@@ -0,0 +1,7 @@
+
+nodes:
+  - kind: block
+    type: image
+    isVoid: true
+    data:
+      src: hello.png