You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: pages_cache_test.go
    path of file: ./repos/hugo/resources/page
    
    the code of the file until where you have to start completion: // Copyright 2019 The Hugo Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// 
    
func TestPageCache(t *testing.T) {
	t.Parallel()
	c := qt.New(t)
	c1 := newPageCache()

	changeFirst := func(p Pages) {
		p[0].(*testPage).description = "changed"
	}

	var o1 uint64
	var o2 uint64

	var wg sync.WaitGroup

	var l1 sync.Mutex
	var l2 sync.Mutex

	var testPageSets []Pages

	for i := 0; i < 50; i++ {
		testPageSets = append(testPageSets, createSortTestPages(i+1))
	}

	for j := 0; j < 100; j++ {
		wg.Add(1)
		go func() {
			defer wg.Done()
			for k, pages := range testPageSets {
				l1.Lock()
				p, ca := c1.get("k1", nil, pages)
				c.Assert(ca, qt.Equals, !atomic.CompareAndSwapUint64(&o1, uint64(k), uint64(k+1)))
				l1.Unlock()
				p2, c2 := c1.get("k1", nil, p)
				c.Assert(c2, qt.Equals, true)
				c.Assert(pagesEqual(p, p2), qt.Equals, true)
				c.Assert(pagesEqual(p, pages), qt.Equals, true)
				c.Assert(p, qt.Not(qt.IsNil))

				l2.Lock()
				p3, c3 := c1.get("k2", changeFirst, pages)
				c.Assert(c3, qt.Equals, !atomic.CompareAndSwapUint64(&o2, uint64(k), uint64(k+1)))
				l2.Unlock()
				c.Assert(p3, qt.Not(qt.IsNil))
				c.Assert("changed", qt.Equals, p3[0].(*testPage).description)
			}
		}()
	}
	wg.Wait()
}