add test for optimization of jsx mode

Author: mununki

tests/ppx/react/expected/optimizeAutomaticMode.res.txt

@@ -0,0 +1,20 @@
+@@jsxConfig({version: 4, mode: "automatic"})
+
+module User = {
+  type t = {firstName: string, lastName: string}
+
+  let format = user => "Dr." ++ user.lastName
+  type props<'doctor> = {
+    doctor: 'doctor,
+  }
+
+  @react.component
+  let make = ({doctor, _}: props<'doctor>) => {
+    ReactDOM.jsx("h1", {id: "h1", children: {React.string(format(doctor))}})
+  }
+  let make = {
+    let \"OptimizeAutomaticMode$User" = (props: props<_>) => make(props)
+
+    \"OptimizeAutomaticMode$User"
+  }
+}

tests/ppx/react/optimizeAutomaticMode.res

@@ -0,0 +1,12 @@
+@@jsxConfig({version: 4, mode: "automatic"})
+
+module User = {
+  type t = {firstName: string, lastName: string}
+
+  let format = user => "Dr." ++ user.lastName
+
+  @react.component
+  let make = (~doctor) => {
+    <h1 id="h1"> {React.string(format(doctor))} </h1>
+  }
+}