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SymbolTests.cs

v0.1.0-build.85 Latest Commit ede38f5

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1using System;
2using System.Text;
3using Xunit;
4
5namespace OpenCKey.Tests
6{
7 public class SymbolTests
8 {
9 [Fact]
10 public void EncodesText()
11 {
12 var symbol = CKeySymbol.Encode("https://openckey.org/hello");
13 Assert.InRange(symbol.Version, 1, CKeySymbol.MaxVersion);
14 Assert.Equal(26, symbol.PayloadLength);
15 Assert.Equal(EccLevel.M, symbol.EccLevel);
16 Assert.Equal(Layout.Standard, symbol.Layout);
17 Assert.InRange(symbol.ModulesAcross, 29, 232);
18 Assert.Equal(symbol.CodewordLength, symbol.GetCodeword().Length);
19 }
20
21 [Fact]
22 public void HonoursVersionLevelAndLayout()
23 {
24 var symbol = CKeySymbol.Encode(Encoding.ASCII.GetBytes("abc"), version: 5, level: EccLevel.H, layout: Layout.Print);
25 Assert.Equal(5, symbol.Version);
26 Assert.Equal(EccLevel.H, symbol.EccLevel);
27 Assert.Equal(Layout.Print, symbol.Layout);
28 }
29
30 [Fact]
31 public void Capacities()
32 {
33 Assert.Equal(0, CKeySymbol.Capacity(0));
34 Assert.Equal(0, CKeySymbol.Capacity(32));
35 Assert.True(CKeySymbol.Capacity(31) > CKeySymbol.Capacity(1));
36 Assert.Equal(4619, CKeySymbol.Capacity(31, EccLevel.M)); // spec/CKey-Payload-Conventions.md
37 Assert.Equal(29, CKeySymbol.ModulesAcrossFor(1));
38 Assert.Equal(232, CKeySymbol.ModulesAcrossFor(31));
39 }
40
41 [Fact]
42 public void RejectsBadArguments()
43 {
44 Assert.Throws<ArgumentNullException>(() => CKeySymbol.Encode((string)null!));
45 Assert.Throws<ArgumentOutOfRangeException>(() => CKeySymbol.Encode("x", version: 32));
46 Assert.Throws<ArgumentOutOfRangeException>(() => CKeySymbol.Encode("x", version: -1));
47 var tooBig = new byte[CKeySymbol.Capacity(1) + 1];
48 var e = Assert.Throws<CKeyException>(() => CKeySymbol.Encode(tooBig, version: 1));
49 Assert.NotEqual(CKeyStatus.Ok, e.Status);
50 }
51
52 [Fact]
53 public void RendersOpaqueAndTransparentRgba()
54 {
55 var symbol = CKeySymbol.Encode("hello");
56 CKeyImage opaque = symbol.RenderRgba(256);
57 Assert.Equal(256, opaque.Width);
58 Assert.Equal(256, opaque.Height);
59 Assert.Equal(256 * 256 * 4, opaque.Rgba.Length);
60 Assert.Equal(255, opaque.Rgba[3]); // corner pixel: painted background
61
62 CKeyImage clear = symbol.RenderRgba(256, RasterPolicy.Binary, transparent: true);
63 Assert.Equal(0, clear.Rgba[3]); // quiet margin: unpainted
64 Assert.Throws<ArgumentOutOfRangeException>(() => symbol.RenderRgba(8));
65 }
66
67 [Fact]
68 public void RenderIsDeterministic()
69 {
70 var symbol = CKeySymbol.Encode("determinism");
71 Assert.Equal(symbol.RenderRgba(200).Rgba, symbol.RenderRgba(200).Rgba);
72 }
73
74 [Fact]
75 public void Exports()
76 {
77 var symbol = CKeySymbol.Encode("exports");
78 byte[] png = symbol.ToPng(128);
79 Assert.Equal(new byte[] { 0x89, (byte)'P', (byte)'N', (byte)'G' }, png[..4]);
80 byte[] grayPng = symbol.RenderGray(128).ToPng(oneBit: true);
81 Assert.Equal(0x89, grayPng[0]);
82 string svg = symbol.ToSvg();
83 Assert.Contains("<svg", svg);
84 Assert.EndsWith(">", svg.TrimEnd());
85 byte[] pdf = symbol.ToPdf();
86 Assert.Equal("%PDF", Encoding.ASCII.GetString(pdf, 0, 4));
87 }
88
89 [Fact]
90 public void PrintRasterIsBinary()
91 {
92 var symbol = CKeySymbol.Encode("print", layout: Layout.Print);
93 CKeyGrayImage print = symbol.RenderPrint(1.0, 300);
94 Assert.InRange(print.Width, 290, 310);
95 Assert.All(print.Gray, v => Assert.True(v == 0 || v == 255));
96 }
97
98 [Fact]
99 public void StylePresetsAndChecks()
100 {
101 CKeyStyle plain = CKeyStyle.Plain;
102 Assert.Equal(CKeyColor.Black, plain.Ink);
103 Assert.Equal(CKeyColor.White, plain.Background);
104 Assert.Equal(StylePolicy.Strict, plain.Policy);
105 CKeyStyle concept = CKeyStyle.Concept;
106 Assert.NotEqual(plain.Background, concept.Background);
107
108 var symbol = CKeySymbol.Encode("styled");
109 Assert.True(symbol.CheckStyle(concept, out _));
110 Assert.Equal(512, symbol.RenderRgba(512, style: concept).Width);
111
112 var unreadable = CKeyStyle.Plain;
113 unreadable.Ink = new CKeyColor(250, 250, 250); // white on white
114 Assert.False(symbol.CheckStyle(unreadable, out string why));
115 Assert.False(string.IsNullOrEmpty(why));
116 Assert.Throws<CKeyException>(() => symbol.RenderRgba(256, style: unreadable));
117 }
118
119 [Fact]
120 public void Certification()
121 {
122 var symbol = CKeySymbol.Encode("certify");
123 CKeyCertification concept = symbol.Certify(CKeyStyle.Concept);
124 Assert.True(concept.IsAccepted, concept.Message);
125 Assert.True(concept.IsCertified, concept.Message);
126 // The photo sweep goes down to sizes too small to read, so a
127 // certified style passes some trials, not necessarily all.
128 Assert.InRange(concept.TrialsPassed, 1, concept.Trials);
129
130 // Transparent output over an unknown background is never certified.
131 CKeyCertification unknown = symbol.Certify(null, transparent: true);
132 Assert.False(unknown.IsCertified);
133 Assert.Contains("background unknown", unknown.Message);
134
135 CKeyCertification onWhite = symbol.Certify(null, transparent: true, backdropColours: new[] { CKeyColor.White });
136 Assert.True(onWhite.IsCertified, onWhite.Message);
137 }
138
139 [Fact]
140 public void ColourParsing()
141 {
142 Assert.Equal(new CKeyColor(0x12, 0x34, 0x56), CKeyColor.Parse("#123456"));
143 Assert.Equal("#abcdef", CKeyColor.FromRgb(0xabcdef).ToString());
144 Assert.Throws<FormatException>(() => CKeyColor.Parse("#12345"));
145 }
146 }
147}