go-langserver/diskcache/cache_test.go at http-basic-auth · sourcegraph/go-langserver · GitHub

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package diskcache

import (

"bytes"

"context"

"io"

"io/ioutil"

"os"

"testing"

)

func TestOpen(t *testing.T) {

dir, err := ioutil.TempDir("", "diskcache_test")

if err != nil {

t.Fatal(err)

}

defer os.RemoveAll(dir)

store := &Store{

Dir: dir,

Component: "test",

}

do := func() (*File, bool) {

want := "foobar"

calledFetcher := false

f, err := store.Open(context.Background(), "key", func(ctx context.Context) (io.ReadCloser, error) {

calledFetcher = true

return ioutil.NopCloser(bytes.NewReader([]byte(want))), nil

})

if err != nil {

t.Fatal(err)

}

got, err := ioutil.ReadAll(f.File)

if err != nil {

t.Fatal(err)

}

f.Close()

if string(got) != want {

t.Fatalf("did not return fetcher output. got %q, want %q", string(got), want)

}

return f, !calledFetcher

}

// Cache should be empty

_, usedCache := do()

if usedCache {

t.Fatal("Expected fetcher to be called on empty cache")

}

// Redo, now we should use the cache

f, usedCache := do()

if !usedCache {

t.Fatal("Expected fetcher to not be called when cached")

}

// Evict, then we should not use the cache

os.Remove(f.Path)

_, usedCache = do()

if usedCache {

t.Fatal("Item was not properly evicted")

}

go-langserver/diskcache/cache_test.go at http-basic-auth · sourcegraph/go-langserver · GitHub

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