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package testutil_test
import (
"fmt"
"github.com/snapcore/snapd/testutil"
. "gopkg.in/check.v1"
)
func ExampleBackup_mockingSimple() {
mockable := func() {
fmt.Println("Original")
}
// Mock
restore := testutil.Backup(&mockable)
mockable = func() {
fmt.Println("Mock")
}
// Restore
restore()
mockable()
// Output: Original
}
func ExampleBackup_mockingMultiple() {
mockableFunc := func() {
fmt.Println("Original function")
}
mockableNumber := 17.53
mockableString := "Original string"
mockableStruct := struct {
first string
second string
}{
first: "Original",
second: "struct",
}
// Mock
restore := testutil.BackupMany(&mockableFunc, &mockableNumber, &mockableString, &mockableStruct)
mockableFunc = func() {
fmt.Println("Mock")
}
mockableNumber = 37
mockableString = "Mock"
mockableStruct.first, mockableStruct.second = "mocked", "value"
// Restore
restore()
mockableFunc()
fmt.Println(mockableNumber, mockableString, mockableStruct)
// Output:
// Original function
// 17.53 Original string {Original struct}
}
var _ = Suite(&MockingTestSuite{})
type MockingTestSuite struct{}
func (s *MockingTestSuite) TestBackup(c *C) {
mockableInt := 2
mockableString := "foo"
mockableFunc := func() string { return "original" }
restore := testutil.Backup(&mockableInt)
mockableInt = 42
restore()
c.Check(mockableInt, Equals, 2)
restore = testutil.Backup(&mockableString)
mockableString = "bar"
restore()
c.Check(mockableString, Equals, "foo")
restore = testutil.Backup(&mockableFunc)
mockableFunc = func() string { return "mock" }
restore()
c.Check(mockableFunc(), Equals, "original")
}
func (s *MockingTestSuite) TestBackupMany(c *C) {
mockable1 := "foo"
mockable2 := 2
mockable3 := func() string { return "foo" }
restore := testutil.BackupMany(&mockable1, &mockable2, &mockable3)
mockable1 = "bar"
mockable2 = 42
mockable3 = func() string { return "bar" }
restore()
c.Check(mockable1, Equals, "foo")
c.Check(mockable2, Equals, 2)
c.Check(mockable3(), Equals, "foo")
}
func (s *MockingTestSuite) TestMock(c *C) {
mockableInt := 2
mockableString := "foo"
mockableFunc := func() string { return "foo" }
type Foo struct {
Bar int
}
mockableStruct := Foo{Bar: 9}
restore := testutil.Mock(&mockableInt, 5)
c.Check(mockableInt, Equals, 5)
restore()
c.Check(mockableInt, Equals, 2)
restore = testutil.Mock(&mockableString, "bar")
c.Check(mockableString, Equals, "bar")
restore()
c.Check(mockableString, Equals, "foo")
restore = testutil.Mock(&mockableFunc, func() string { return "bar" })
c.Check(mockableFunc(), Equals, "bar")
restore()
c.Check(mockableFunc(), Equals, "foo")
restore = testutil.Mock(&mockableStruct, Foo{Bar: 12})
c.Check(mockableStruct, Equals, Foo{Bar: 12})
restore()
c.Check(mockableStruct, Equals, Foo{Bar: 9})
// XXX does not build because the types don't match
// restore = testutil.Mock(&mockableFunc, func() int { return 555 })
// restore()
}
|
