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: distance_test.go
    path of file: ./repos/cockroach/pkg/geo/geomfn
    
    the code of the file until where you have to start completion: // Copyright 2020 The Cockroach Authors.
//
// Use of this software is governed by the Business Source License
// included in the file licenses/BSL.txt.
//
// As of the Change Date specified in that file, in accordance with
// the Business Source License, use of this software will be governed
// by the Apache License, Version 2.0, included in the file
// licenses/APL.txt.

package geomfn

import (
	"fmt"
	"math"
	"testing"

	"github.com/cockroachdb/cockroach/pkg/geo"
	"github.com/cockroachdb/cockroach/pkg/geo/geos"
	"github.com/cockroachdb/cockroach/pkg/geo/geotest"
	"github.com/stretchr/testify/require"
)

var distanceTestCases = []struct {
	desc                 string
	a                    string
	b                    string
	expectedMinDistance  float64
	expectedMaxDistance  float64
	expectedLongestLine  string
	expectedShortestLine string
}{
	{
		"Same P
    
func TestHausdorffDistance(t *testing.T) {
	pf := func(f float64) *float64 { return &f }

	testCases := []struct {
		a        string
		b        string
		expected *float64
	}{
		{"LINESTRING EMPTY", "LINESTRING EMPTY", nil},
		{"LINESTRING (0 0, 3 7, 5 5)", "LINESTRING EMPTY", nil},
		{"LINESTRING EMPTY", "LINESTRING (0 0, 9 1, 2 2)", nil},
		{"LINESTRING (0 0, 3 7, 5 5)", "LINESTRING (0 0, 9 1, 2 2)", pf(5.656854249492381)},
	}

	for _, tc := range testCases {
		t.Run(fmt.Sprintf("%v %v", tc.a, tc.b), func(t *testing.T) {
			a, err := geo.ParseGeometry(tc.a)
			require.NoError(t, err)
			b, err := geo.ParseGeometry(tc.b)
			require.NoError(t, err)

			ret, err := HausdorffDistance(a, b)
			require.NoError(t, err)
			if tc.expected != nil && ret != nil {
				require.Equal(t, *tc.expected, *ret)
			} else {
				require.Equal(t, tc.expected, ret)
			}
		})
	}

	t.Run("errors if SRIDs mismatch", func(t *testing.T) {
		_, err := HausdorffDistance(mismatchingSRIDGeometryA, mismatchingSRIDGeometryB)
		requireMismatchingSRIDError(t, err)
	})
}