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add tests for pagePosition

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	`1`	`+/// <reference path="../../../typings/globals/jest/index.d.ts" />`
	`2`	`+`
	`3`	`+importreducerfrom'./index';`
	`4`	`+import{PAGE_SET}from'../types';`
	`5`	`+`
	`6`	`+describe('page position reducer',()=>{`
	`7`	`+`
	`8`	`+it('does nothing if no known action',()=>{`
	`9`	`+constaction={type:'unknown'};`
	`10`	`+expect(reducer(undefined,action)).toBe(0);`
	`11`	`+});`
	`12`	`+`
	`13`	`+it('handles PAGE_SET',()=>{`
	`14`	`+constpagePosition=2;`
	`15`	`+constaction={type:PAGE_SET,payload:{ pagePosition}};`
	`16`	`+expect(reducer(0,action)).toBe(pagePosition);`
	`17`	`+});`
	`18`	`+`
	`19`	`+it('handles PROGRESS_PAGE_POSITION',()=>{`
	`20`	`+constprogress={`
	`21`	`+pages:[true,true,true,false,false]`
	`22`	`+};`
	`23`	`+constaction={type:'PROGRESS_PAGE_POSITION',payload:{ progress}};`
	`24`	`+expect(reducer(0,action)).toBe(3);`
	`25`	`+});`
	`26`	`+`
	`27`	`+});`

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