mirror of https://github.com/golang/go.git
70 lines
1.9 KiB
Go
70 lines
1.9 KiB
Go
// Copyright 2019 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package memoize_test
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import (
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"context"
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"strings"
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"testing"
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"golang.org/x/tools/internal/memoize"
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)
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func TestGet(t *testing.T) {
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s := &memoize.Store{}
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g := s.Generation("x")
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evaled := 0
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h := g.Bind("key", func(context.Context, memoize.Arg) interface{} {
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evaled++
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return "res"
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})
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expectGet(t, h, g, "res")
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expectGet(t, h, g, "res")
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if evaled != 1 {
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t.Errorf("got %v calls to function, wanted 1", evaled)
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}
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}
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func expectGet(t *testing.T, h *memoize.Handle, g *memoize.Generation, wantV interface{}) {
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gotV, gotErr := h.Get(context.Background(), g, nil)
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if gotV != wantV || gotErr != nil {
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t.Fatalf("Get() = %v, %v, wanted %v, nil", gotV, gotErr, wantV)
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}
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}
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func expectGetError(t *testing.T, h *memoize.Handle, g *memoize.Generation, substr string) {
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gotV, gotErr := h.Get(context.Background(), g, nil)
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if gotErr == nil || !strings.Contains(gotErr.Error(), substr) {
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t.Fatalf("Get() = %v, %v, wanted err %q", gotV, gotErr, substr)
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}
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}
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func TestGenerations(t *testing.T) {
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s := &memoize.Store{}
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// Evaluate key in g1.
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g1 := s.Generation("g1")
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h1 := g1.Bind("key", func(context.Context, memoize.Arg) interface{} { return "res" })
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expectGet(t, h1, g1, "res")
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// Get key in g2. It should inherit the value from g1.
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g2 := s.Generation("g2")
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h2 := g2.Bind("key", func(context.Context, memoize.Arg) interface{} {
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t.Fatal("h2 should not need evaluation")
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return "error"
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})
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expectGet(t, h2, g2, "res")
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// With g1 destroyed, g2 should still work.
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g1.Destroy()
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expectGet(t, h2, g2, "res")
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// With all generations destroyed, key should be re-evaluated.
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g2.Destroy()
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g3 := s.Generation("g3")
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h3 := g3.Bind("key", func(context.Context, memoize.Arg) interface{} { return "new res" })
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expectGet(t, h3, g3, "new res")
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}
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