1 // Copyright 2016 The Go Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style 3 // license that can be found in the LICENSE file. 4 5 package types 6 7 import "testing" 8 9 func TestIsAlias(t *testing.T) { 10 check := func(obj *TypeName, want bool) { 11 if got := obj.IsAlias(); got != want { 12 t.Errorf("%v: got IsAlias = %v; want %v", obj, got, want) 13 } 14 } 15 16 // predeclared types 17 check(Unsafe.Scope().Lookup("Pointer").(*TypeName), false) 18 for _, name := range Universe.Names() { 19 if obj, _ := Universe.Lookup(name).(*TypeName); obj != nil { 20 check(obj, name == "byte" || name == "rune") 21 } 22 } 23 24 // various other types 25 pkg := NewPackage("p", "p") 26 t1 := NewTypeName(0, pkg, "t1", nil) 27 n1 := NewNamed(t1, new(Struct), nil) 28 for _, test := range []struct { 29 name *TypeName 30 alias bool 31 }{ 32 {NewTypeName(0, nil, "t0", nil), false}, // no type yet 33 {NewTypeName(0, pkg, "t0", nil), false}, // no type yet 34 {t1, false}, // type name refers to named type and vice versa 35 {NewTypeName(0, nil, "t2", &emptyInterface), true}, // type name refers to unnamed type 36 {NewTypeName(0, pkg, "t3", n1), true}, // type name refers to named type with different type name 37 {NewTypeName(0, nil, "t4", Typ[Int32]), true}, // type name refers to basic type with different name 38 {NewTypeName(0, nil, "int32", Typ[Int32]), false}, // type name refers to basic type with same name 39 {NewTypeName(0, pkg, "int32", Typ[Int32]), true}, // type name is declared in user-defined package (outside Universe) 40 {NewTypeName(0, nil, "rune", Typ[Rune]), true}, // type name refers to basic type rune which is an alias already 41 } { 42 check(test.name, test.alias) 43 } 44 } 45
