Source file src/reflect/map_test.go

     1  // Copyright 2024 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 reflect_test
     6  
     7  import (
     8  	"reflect"
     9  	"testing"
    10  )
    11  
    12  // See also runtime_test.TestGroupSizeZero.
    13  func TestGroupSizeZero(t *testing.T) {
    14  	st := reflect.TypeFor[struct{}]()
    15  	grp := reflect.MapGroupOf(st, st)
    16  
    17  	// internal/runtime/maps when create pointers to slots, even if slots
    18  	// are size 0. We should have reserved an extra word to ensure that
    19  	// pointers to the zero-size type at the end of group are valid.
    20  	if grp.Size() <= 8 {
    21  		t.Errorf("Group size got %d want >8", grp.Size())
    22  	}
    23  }
    24  

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