You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: store_test.go
    path of file: ./repos/wazero/internal/wasm
    
    the code of the file until where you have to start completion: package wasm

import (
	"context"
	"errors"
	"fmt"
	"math"
	"strconv"
	"testing"

	"github.com/tetratelabs/wazero/api"
	"github.com/tetratelabs/wazero/experimental"
	"github.com/tetratelabs/wazero/internal/internalapi"
	"github.com/tetratelabs/wazero/internal/leb128"
	"github.com/tetratelabs/wazero/internal/sys"
	"github.com/tetratelabs/wazero/internal/testing/hammer"
	"github.com/tetratelabs/wazero/internal/testing/require"
	"github.com/tetratelabs/wazero/internal/u64"
)

func TestModuleInstance_Memory(t *testing.T) {
	tests := []struct {
		name        string
		input       *Module
		expected    bool
		expectedLen uint
    
func TestStore_hammer_close(t *testing.T) {
	const importedModuleName = "imported"

	m, err := NewHostModule(
		importedModuleName,
		[]string{"fn"},
		map[string]*HostFunc{"fn": {ExportName: "fn", Code: Code{GoFunc: func() {}}}},
		api.CoreFeaturesV1,
	)
	require.NoError(t, err)

	s := newStore()
	imported, err := s.Instantiate(testCtx, m, importedModuleName, nil, []FunctionTypeID{0})
	require.NoError(t, err)

	_, ok := s.nameToModule[imported.Name()]
	require.True(t, ok)

	importingModule := &Module{
		ImportFunctionCount:     1,
		TypeSection:             []FunctionType{v_v},
		FunctionSection:         []uint32{0},
		CodeSection:             []Code{{Body: []byte{OpcodeEnd}}},
		MemorySection:           &Memory{Min: 1, Cap: 1},
		MemoryDefinitionSection: []MemoryDefinition{{}},
		GlobalSection: []Global{{
			Type: GlobalType{ValType: ValueTypeI32},
			Init: ConstantExpression{Opcode: OpcodeI32Const, Data: leb128.EncodeInt32(1)},
		}},
		TableSection: []Table{{Min: 10}},
		ImportSection: []Import{
			{Type: ExternTypeFunc, Module: importedModuleName, Name: "fn", DescFunc: 0},
		},
	}

	const instCount = 10000
	instances := make([]api.Module, instCount)
	for i := 0; i < instCount; i++ {
		mod, instantiateErr := s.Instantiate(testCtx, importingModule, strconv.Itoa(i), sys.DefaultContext(nil), []FunctionTypeID{0})
		require.NoError(t, instantiateErr)
		instances[i] = mod
	}

	hammer.NewHammer(t, 100, 2).Run(func(name string) {
		for i := 0; i < instCount; i++ {
			if i == instCount/2 {
				// Close store concurrently as well.
				err := s.CloseWithExitCode(testCtx, 0)
				require.NoError(t, err)
			}
			err := instances[i].CloseWithExitCode(testCtx, 0)
			require.NoError(t, err)
		}
		require.NoError(t, err)
	}, nil)
	if t.Failed() {
		return // At least one test failed, so return now.
	}

	// All instances are freed.
	require.Nil(t, s.moduleList)
}