add on-select behavior test

test/behavior/fixtures/on-select/move-selection/index.js

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+
+import Simulate from '../../../../helpers/simulate'
+import { Selection } from '../../../../..'
+
+export default function (state, stack) {
+  const selection = Selection.create({
+    anchorKey: 'c',
+    anchorOffset: 1,
+    focusKey: 'c',
+    focusOffset: 1,
+    isFocused: true,
+  })
+
+  return Simulate.select(stack, state, null, { selection })
+}

test/behavior/fixtures/on-select/move-selection/input.yaml

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+
+document:
+  key: a
+  nodes:
+  - key: b
+    kind: block
+    type: paragraph
+    nodes:
+    - key: c
+      kind: text
+      text: word
+selection:
+  anchorKey: c
+  anchorOffset: 0
+  focusKey: c
+  focusOffset: 0
+  isFocused: true

test/behavior/fixtures/on-select/move-selection/output.yaml

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+
+document:
+  key: a
+  nodes:
+  - key: b
+    kind: block
+    type: paragraph
+    nodes:
+    - key: c
+      kind: text
+      text: word
+selection:
+  anchorKey: c
+  anchorOffset: 1
+  focusKey: c
+  focusOffset: 1
+  isFocused: true