set_test.go

     1  // Copyright 2011 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 reflectlite_test
     6  
     7  import (
     8  	"bytes"
     9  	"go/ast"
    10  	"go/token"
    11  	. "internal/reflectlite"
    12  	"io"
    13  	"testing"
    14  )
    15  
    16  func TestImplicitSetConversion(t *testing.T) {
    17  	// Assume TestImplicitMapConversion covered the basics.
    18  	// Just make sure conversions are being applied at all.
    19  	var r io.Reader
    20  	b := new(bytes.Buffer)
    21  	rv := ValueOf(&r).Elem()
    22  	rv.Set(ValueOf(b))
    23  	if r != b {
    24  		t.Errorf("after Set: r=%T(%v)", r, r)
    25  	}
    26  }
    27  
    28  var implementsTests = []struct {
    29  	x any
    30  	t any
    31  	b bool
    32  }{
    33  	{new(*bytes.Buffer), new(io.Reader), true},
    34  	{new(bytes.Buffer), new(io.Reader), false},
    35  	{new(*bytes.Buffer), new(io.ReaderAt), false},
    36  	{new(*ast.Ident), new(ast.Expr), true},
    37  	{new(*notAnExpr), new(ast.Expr), false},
    38  	{new(*ast.Ident), new(notASTExpr), false},
    39  	{new(notASTExpr), new(ast.Expr), false},
    40  	{new(ast.Expr), new(notASTExpr), false},
    41  	{new(*notAnExpr), new(notASTExpr), true},
    42  	{new(mapError), new(error), true},
    43  	{new(*mapError), new(error), true},
    44  }
    45  
    46  type notAnExpr struct{}
    47  
    48  func (notAnExpr) Pos() token.Pos { return token.NoPos }
    49  func (notAnExpr) End() token.Pos { return token.NoPos }
    50  func (notAnExpr) exprNode()      {}
    51  
    52  type notASTExpr interface {
    53  	Pos() token.Pos
    54  	End() token.Pos
    55  	exprNode()
    56  }
    57  
    58  type mapError map[string]string
    59  
    60  func (mapError) Error() string { return "mapError" }
    61  
    62  // For this test, both mapError and *mapError implement error,
    63  // though in general this leads to ambiguity.
    64  var _ error = mapError{}
    65  var _ error = new(mapError)
    66  
    67  func TestImplements(t *testing.T) {
    68  	for _, tt := range implementsTests {
    69  		xv := TypeOf(tt.x).Elem()
    70  		xt := TypeOf(tt.t).Elem()
    71  		if b := xv.Implements(xt); b != tt.b {
    72  			t.Errorf("(%s).Implements(%s) = %v, want %v", TypeString(xv), TypeString(xt), b, tt.b)
    73  		}
    74  	}
    75  }
    76  
    77  var assignableTests = []struct {
    78  	x any
    79  	t any
    80  	b bool
    81  }{
    82  	{new(chan int), new(<-chan int), true},
    83  	{new(<-chan int), new(chan int), false},
    84  	{new(*int), new(IntPtr), true},
    85  	{new(IntPtr), new(*int), true},
    86  	{new(IntPtr), new(IntPtr1), false},
    87  	{new(Ch), new(<-chan any), true},
    88  	// test runs implementsTests too
    89  }
    90  
    91  type IntPtr *int
    92  type IntPtr1 *int
    93  type Ch <-chan any
    94  
    95  func TestAssignableTo(t *testing.T) {
    96  	for i, tt := range append(assignableTests, implementsTests...) {
    97  		xv := TypeOf(tt.x).Elem()
    98  		xt := TypeOf(tt.t).Elem()
    99  		if b := xv.AssignableTo(xt); b != tt.b {
   100  			t.Errorf("%d:AssignableTo: got %v, want %v", i, b, tt.b)
   101  		}
   102  	}
   103  }
   104
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