Source file src/reflect/map_swiss_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  //go:build goexperiment.swissmap
     6  
     7  package reflect_test
     8  
     9  import (
    10  	"reflect"
    11  	"testing"
    12  )
    13  
    14  func testGCBitsMap(t *testing.T) {
    15  	// Unlike old maps, we don't manually construct GC data for swiss maps,
    16  	// instead using the public reflect API in groupAndSlotOf.
    17  }
    18  
    19  // See also runtime_test.TestGroupSizeZero.
    20  func TestGroupSizeZero(t *testing.T) {
    21  	st := reflect.TypeFor[struct{}]()
    22  	grp := reflect.MapGroupOf(st, st)
    23  
    24  	// internal/runtime/maps when create pointers to slots, even if slots
    25  	// are size 0. We should have reserved an extra word to ensure that
    26  	// pointers to the zero-size type at the end of group are valid.
    27  	if grp.Size() <= 8 {
    28  		t.Errorf("Group size got %d want >8", grp.Size())
    29  	}
    30  }
    31  

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