Fix build error caused from lodash.get in test (node v4, v6, v7)

[tngan]

src/binding-post.ts(32,12): error TS2554: Expected 2-3 arguments, but got 2.
src/binding-post.ts(33,24): error TS2554: Expected 2-3 arguments, but got 2.
src/binding-post.ts(112,21): error TS2554: Expected 2-3 arguments, but got 2.
src/binding-post.ts(118,25): error TS2554: Expected 2-3 arguments, but got 2.
src/binding-post.ts(207,12): error TS2554: Expected 2-3 arguments, but got 2.
src/binding-post.ts(208,24): error TS2554: Expected 2-3 arguments, but got 2.
src/binding-redirect.ts(88,12): error TS2554: Expected 2-3 arguments, but got 2.
src/binding-redirect.ts(89,24): error TS2554: Expected 2-3 arguments, but got 2.
src/binding-redirect.ts(133,12): error TS2554: Expected 2-3 arguments, but got 2.
src/binding-redirect.ts(134,24): error TS2554: Expected 2-3 arguments, but got 2.
src/binding-redirect.ts(181,12): error TS2554: Expected 2-3 arguments, but got 2.
src/binding-redirect.ts(182,25): error TS2554: Expected 2-3 arguments, but got 2.