render_test.gno

 1package life
 2
 3import (
 4	"strconv"
 5	"strings"
 6	"testing"
 7
 8	"gno.land/p/nt/uassert/v0"
 9)
10
11// ExampleRender pins the whole page on a deliberately small board so the
12// expected output stays readable. initBoard resets the grid, so this example
13// is independent of the tests that run before it.
14func ExampleRender() {
15	initBoard(5, 3)
16	SetCell(1, 1, true)
17	SetCell(2, 1, true)
18	SetCell(3, 1, true)
19	print(Render(""))
20	// Output:
21	// # Conway's Game of Life
22	//
23	// > A classic cellular automaton, ported to Gno — board state lives on-chain.
24	//
25	// **Generation:** 0 | **Population:** 3 | **Board:** 5×3
26	//
27	// ```
28	// +-----+
29	// |.....|
30	// |.OOO.|
31	// |.....|
32	// +-----+
33	// ```
34	//
35	// ## Transactions
36	//
37	// | Call | Effect |
38	// |---|---|
39	// | `Step()` | Advance one generation |
40	// | `MultiStep(n)` | Advance *n* generations (max 100) |
41	// | `SetCell(x, y, alive)` | Flip a single cell |
42	// | `Reset(w, h)` | Clear and resize (max 50×40) |
43	// | `LoadPreset(name)` | `glider` · `blinker` · `toad` · `beacon` · `block` · `pulsar` |
44	//
45	// ## Rules
46	//
47	// 1. A live cell with 2 or 3 live neighbours survives.
48	// 2. A dead cell with exactly 3 live neighbours becomes alive.
49	// 3. All other cells die or remain dead.
50}
51
52// TestRenderTracksGeneration checks the header counters follow the simulation.
53func TestRenderTracksGeneration(t *testing.T) {
54	initBoard(5, 3)
55	SetCell(1, 1, true)
56	SetCell(2, 1, true)
57	SetCell(3, 1, true)
58
59	uassert.True(t, strings.Contains(Render(""), "**Generation:** 0 | **Population:** 3"),
60		"fresh board should report generation 0")
61
62	Step() // blinker rotates to vertical; on a 3-row board only the centre survives
63	out := Render("")
64	uassert.True(t, strings.Contains(out, "**Generation:** 1"), "generation should advance")
65	uassert.True(t, strings.Contains(out, "**Population:** "+strconv.Itoa(population)),
66		"rendered population should match the counter")
67}
68
69// TestRenderDrawsLiveCells checks the ASCII grid maps cells to O/. correctly.
70func TestRenderDrawsLiveCells(t *testing.T) {
71	initBoard(3, 3)
72	SetCell(0, 0, true)
73	SetCell(2, 2, true)
74
75	out := Render("")
76	uassert.True(t, strings.Contains(out, "+---+\n|O..|\n|...|\n|..O|\n+---+"),
77		"corners should render as live cells")
78}
79
80// TestRenderBoardDimensions checks the border and header follow a resize.
81func TestRenderBoardDimensions(t *testing.T) {
82	initBoard(8, 2)
83	out := Render("")
84	uassert.True(t, strings.Contains(out, "**Board:** 8×2"), "header should report the new size")
85	uassert.True(t, strings.Contains(out, "+"+strings.Repeat("-", 8)+"+"), "border should match width")
86}
87
88// TestRenderIgnoresPath documents that Render has no sub-routes.
89func TestRenderIgnoresPath(t *testing.T) {
90	initBoard(4, 4)
91	uassert.Equal(t, Render(""), Render("/whatever"))
92}