tests for convertToSnakeCase function

src/plugins/kibana/server/lib/__tests__/convert_to_snake_case.js

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+const expect = require('expect.js');
+const convertToSnakeCase = require('../convert_to_snake_case');
+const _ = require('lodash');
+
+describe('convertToSnakeCase', function () {
+
+  it('should convert all of an object\'s keys to snake case', function () {
+    const result = convertToSnakeCase({
+      camelCase: 'camel_case',
+      'kebab-case': 'kebab_case',
+      snake_case: 'snake_case'
+    });
+
+    _.forEach(result, function (value, key) {
+      expect(key).to.be(value);
+    });
+  });
+
+});