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// Copyright ©2014 The Gonum Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package testgraphs
import (
"bytes"
"errors"
"reflect"
"strings"
"testing"
"gonum.org/v1/gonum/graph"
"gonum.org/v1/gonum/graph/simple"
)
var _ graph.Graph = (*Grid)(nil)
func join(g ...string) string { return strings.Join(g, "\n") }
type node int64
func (n node) ID() int64 { return int64(n) }
func TestGrid(t *testing.T) {
t.Parallel()
g := NewGrid(4, 4, false)
got := g.String()
want := join(
"****",
"****",
"****",
"****",
)
if got != want {
t.Fatalf("unexpected grid rendering:\ngot: %q\nwant:%q", got, want)
}
var ops = []struct {
r, c int
state bool
want string
}{
{
r: 0, c: 1,
state: true,
want: join(
"*.**",
"****",
"****",
"****",
),
},
{
r: 0, c: 1,
state: false,
want: join(
"****",
"****",
"****",
"****",
),
},
{
r: 0, c: 1,
state: true,
want: join(
"*.**",
"****",
"****",
"****",
),
},
{
r: 0, c: 2,
state: true,
want: join(
"*..*",
"****",
"****",
"****",
),
},
{
r: 1, c: 2,
state: true,
want: join(
"*..*",
"**.*",
"****",
"****",
),
},
{
r: 2, c: 2,
state: true,
want: join(
"*..*",
"**.*",
"**.*",
"****",
),
},
{
r: 3, c: 2,
state: true,
want: join(
"*..*",
"**.*",
"**.*",
"**.*",
),
},
}
for _, test := range ops {
g.Set(test.r, test.c, test.state)
got := g.String()
if got != test.want {
t.Fatalf("unexpected grid rendering after set (%d, %d) open state to %t:\ngot: %q\nwant:%q",
test.r, test.c, test.state, got, test.want)
}
}
// Match the last state from the loop against the
// explicit description of the grid.
got = NewGridFrom(
"*..*",
"**.*",
"**.*",
"**.*",
).String()
want = g.String()
if got != want {
t.Fatalf("unexpected grid rendering from NewGridFrom:\ngot: %q\nwant:%q", got, want)
}
var paths = []struct {
path []graph.Node
diagonal bool
want string
}{
{
path: nil,
diagonal: false,
want: join(
"*..*",
"**.*",
"**.*",
"**.*",
),
},
{
path: []graph.Node{node(1), node(2), node(6), node(10), node(14)},
diagonal: false,
want: join(
"*So*",
"**o*",
"**o*",
"**G*",
),
},
{
path: []graph.Node{node(1), node(6), node(10), node(14)},
diagonal: false,
want: join(
"*S.*",
"**!*",
"**.*",
"**.*",
),
},
{
path: []graph.Node{node(1), node(6), node(10), node(14)},
diagonal: true,
want: join(
"*S.*",
"**o*",
"**o*",
"**G*",
),
},
{
path: []graph.Node{node(1), node(5), node(9)},
diagonal: false,
want: join(
"*S.*",
"*!.*",
"**.*",
"**.*",
),
},
}
for _, test := range paths {
g.AllowDiagonal = test.diagonal
got, err := g.Render(test.path)
errored := err != nil
if bytes.Contains(got, []byte{'!'}) != errored {
t.Fatalf("unexpected error return: got:%v want:%v", err, errors.New("grid: not a path in graph"))
}
if string(got) != test.want {
t.Fatalf("unexpected grid path rendering for %v:\ngot: %q\nwant:%q", test.path, got, want)
}
}
var coords = []struct {
r, c int
id int64
}{
{r: 0, c: 0, id: 0},
{r: 0, c: 3, id: 3},
{r: 3, c: 0, id: 12},
{r: 3, c: 3, id: 15},
}
for _, test := range coords {
if id := g.NodeAt(test.r, test.c).ID(); id != test.id {
t.Fatalf("unexpected ID for node at (%d, %d):\ngot: %d\nwant:%d", test.r, test.c, id, test.id)
}
if r, c := g.RowCol(test.id); r != test.r || c != test.c {
t.Fatalf("unexpected row/col for node %d:\ngot: (%d, %d)\nwant:(%d, %d)", test.id, r, c, test.r, test.c)
}
}
var reach = []struct {
from graph.Node
diagonal bool
to []graph.Node
}{
{
from: node(0),
diagonal: false,
to: nil,
},
{
from: node(2),
diagonal: false,
to: []graph.Node{simple.Node(1), simple.Node(6)},
},
{
from: node(1),
diagonal: false,
to: []graph.Node{simple.Node(2)},
},
{
from: node(1),
diagonal: true,
to: []graph.Node{simple.Node(2), simple.Node(6)},
},
}
for _, test := range reach {
g.AllowDiagonal = test.diagonal
got := graph.NodesOf(g.From(test.from.ID()))
if !reflect.DeepEqual(got, test.to) {
t.Fatalf("unexpected nodes from %d with allow diagonal=%t:\ngot: %v\nwant:%v",
test.from, test.diagonal, got, test.to)
}
}
}
|
