move all plugin tests out of babel-core and into their appropriate folders

packages/babel-plugin-transform-react-inline-elements/test/fixtures/inline-elements/nested/actual.js

@@ -0,0 +1 @@
+<div className="foo">{bar}<Baz key="baz" /></div>

packages/babel-plugin-transform-react-inline-elements/test/fixtures/inline-elements/nested/expected.js

@@ -0,0 +1,18 @@
+({
+  $$typeof: babelHelpers.typeofReactElement,
+  type: "div",
+  key: null,
+  ref: null,
+  props: {
+    className: "foo",
+    children: [bar, {
+      $$typeof: babelHelpers.typeofReactElement,
+      type: Baz,
+      key: "baz",
+      ref: null,
+      props: Baz.defaultProps,
+      _owner: null
+    }]
+  },
+  _owner: null
+});