cache/cache_test.go

package cache

import (
	"testing"
	"time"
)

func TestCache(t *testing.T) {
	tc := New(0, 0)

	a, found := tc.Get("a")
	if found || a != nil {
		t.Error("Getting A found value that shouldn't exist:", a)
	}

	b, found := tc.Get("b")
	if found || b != nil {
		t.Error("Getting B found value that shouldn't exist:", b)
	}

	c, found := tc.Get("c")
	if found || c != nil {
		t.Error("Getting C found value that shouldn't exist:", c)
	}

	tc.Set("a", 1, 0)
	tc.Set("b", "b", 0)
	tc.Set("c", 3.5, 0)

	x, found := tc.Get("a")
	if !found {
		t.Error("a was not found while getting a2")
	}
	if x == nil {
		t.Error("x for a is nil")
	} else if a2 := x.(int); a2 + 2 != 3 {
		t.Error("a2 (which should be 1) plus 2 does not equal 3; value:", a2)
	}

	x, found = tc.Get("b")
	if !found {
		t.Error("b was not found while getting b2")
	}
	if x == nil {
		t.Error("x for b is nil")
	} else if b2 := x.(string); b2 + "B" != "bB" {
		t.Error("b2 (which should be b) plus B does not equal bB; value:", b2)
	}

	x, found = tc.Get("c")
	if !found {
		t.Error("c was not found while getting c2")
	}
	if x == nil {
		t.Error("x for c is nil")
	} else if c2 := x.(float64); c2 + 1.2 != 4.7 {
		t.Error("c2 (which should be 3.5) plus 1.2 does not equal 4.7; value:", c2)
	}
}

func TestCacheTimes(t *testing.T) {
	var found bool

	tc := New(50*time.Millisecond, 1*time.Millisecond)
	tc.Set("a", 1, 0)
	tc.Set("b", 2, -1)
	tc.Set("c", 3, 20*time.Millisecond)
	tc.Set("d", 4, 70*time.Millisecond)

	<-time.After(25*time.Millisecond)
	_, found = tc.Get("c")
	if found {
		t.Error("Found c when it should have been automatically deleted")
	}

	<-time.After(30*time.Millisecond)
	_, found = tc.Get("a")
	if found {
		t.Error("Found a when it should have been automatically deleted")
	}

	_, found = tc.Get("b")
	if !found {
		t.Error("Did not find b even though it was set to never expire")
	}

	_, found = tc.Get("d")
	if !found {
		t.Error("Did not find d even though it was set to expire later than the default")
	}

	<-time.After(20*time.Millisecond)
	_, found = tc.Get("d")
	if found {
		t.Error("Found d when it should have been automatically deleted (later than the default)")
	}
}

type TestStruct struct {
	Num int
}

func TestStorePointerToStruct(t *testing.T) {
	tc := New(0, 0)
	tc.Set("foo", &TestStruct{Num: 1}, 0)
	x, found := tc.Get("foo")
	if !found {
		t.Fatal("*TestStruct was not found for foo")
	}
	foo := x.(*TestStruct)
	foo.Num++

	y, found := tc.Get("foo")
	if !found {
		t.Fatal("*TestStruct was not found for foo (second time)")
	}
	bar := y.(*TestStruct)
	if bar.Num != 2 {
		t.Fatal("TestStruct.Num is not 2")
	}
}