forked from juju/testing
/
patch_test.go
100 lines (81 loc) · 2.64 KB
/
patch_test.go
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// Copyright 2013, 2014 Canonical Ltd.
// Licensed under the LGPLv3, see LICENCE file for details.
package testing_test
import (
"errors"
"os"
gc "launchpad.net/gocheck"
"github.com/juju/testing"
)
type PatchValueSuite struct{}
var _ = gc.Suite(&PatchValueSuite{})
func (*PatchValueSuite) TestSetInt(c *gc.C) {
i := 99
restore := testing.PatchValue(&i, 88)
c.Assert(i, gc.Equals, 88)
restore()
c.Assert(i, gc.Equals, 99)
}
func (*PatchValueSuite) TestSetError(c *gc.C) {
oldErr := errors.New("foo")
newErr := errors.New("bar")
err := oldErr
restore := testing.PatchValue(&err, newErr)
c.Assert(err, gc.Equals, newErr)
restore()
c.Assert(err, gc.Equals, oldErr)
}
func (*PatchValueSuite) TestSetErrorToNil(c *gc.C) {
oldErr := errors.New("foo")
err := oldErr
restore := testing.PatchValue(&err, nil)
c.Assert(err, gc.Equals, nil)
restore()
c.Assert(err, gc.Equals, oldErr)
}
func (*PatchValueSuite) TestSetMapToNil(c *gc.C) {
oldMap := map[string]int{"foo": 1234}
m := oldMap
restore := testing.PatchValue(&m, nil)
c.Assert(m, gc.IsNil)
restore()
c.Assert(m, gc.DeepEquals, oldMap)
}
func (*PatchValueSuite) TestSetPanicsWhenNotAssignable(c *gc.C) {
i := 99
type otherInt int
c.Assert(func() { testing.PatchValue(&i, otherInt(88)) }, gc.PanicMatches, `reflect\.Set: value of type testing_test\.otherInt is not assignable to type int`)
}
type PatchEnvironmentSuite struct{}
var _ = gc.Suite(&PatchEnvironmentSuite{})
func (*PatchEnvironmentSuite) TestPatchEnvironment(c *gc.C) {
const envName = "TESTING_PATCH_ENVIRONMENT"
// remember the old value, and set it to something we can check
oldValue := os.Getenv(envName)
os.Setenv(envName, "initial")
restore := testing.PatchEnvironment(envName, "new value")
// Using check to make sure the environment gets set back properly in the test.
c.Check(os.Getenv(envName), gc.Equals, "new value")
restore()
c.Check(os.Getenv(envName), gc.Equals, "initial")
os.Setenv(envName, oldValue)
}
func (*PatchEnvironmentSuite) TestRestorerAdd(c *gc.C) {
var order []string
first := testing.Restorer(func() { order = append(order, "first") })
second := testing.Restorer(func() { order = append(order, "second") })
restore := first.Add(second)
restore()
c.Assert(order, gc.DeepEquals, []string{"second", "first"})
}
func (*PatchEnvironmentSuite) TestPatchEnvPathPrepend(c *gc.C) {
oldPath := os.Getenv("PATH")
dir := "/bin/bar"
// just in case something goes wrong
defer os.Setenv("PATH", oldPath)
restore := testing.PatchEnvPathPrepend(dir)
expect := dir + string(os.PathListSeparator) + oldPath
c.Check(os.Getenv("PATH"), gc.Equals, expect)
restore()
c.Check(os.Getenv("PATH"), gc.Equals, oldPath)
}