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

packages/babel-plugin-transform-es2015-instanceof/test/fixtures/instanceof/instanceof/actual.js

@@ -0,0 +1 @@
+a instanceof b;

packages/babel-plugin-transform-es2015-instanceof/test/fixtures/instanceof/instanceof/exec.js

@@ -0,0 +1,25 @@
+var foo = {};
+foo[Symbol.hasInstance]= function () { return true; };
+
+var bar = {};
+
+assert.ok(bar instanceof foo);
+assert.ok(new String instanceof String);
+
+//
+
+function Greeting(greeting) {
+  this.greeting = greeting;
+}
+
+Object.defineProperty(Greeting, Symbol.hasInstance, {
+  value: function(inst) {
+    return inst.greeting == "hello";
+  }
+});
+
+var a = new Greeting("hello");
+var b = new Greeting("world");
+
+assert.ok(a instanceof Greeting);
+assert.ok(!(b instanceof Greeting));

packages/babel-plugin-transform-es2015-instanceof/test/fixtures/instanceof/instanceof/expected.js

@@ -0,0 +1 @@
+babelHelpers._instanceof(a, b);

packages/babel-plugin-transform-es2015-instanceof/test/fixtures/instanceof/instanceof/options.json

@@ -0,0 +1,3 @@
+{
+  "plugins": ["external-helpers-2", "transform-es2015-instanceof"]
+}

packages/babel-plugin-transform-es2015-instanceof/test/index.js

@@ -0,0 +1 @@
+require("babel-helper-plugin-test-runner")(__dirname);