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| 1 | +using System; |
| 2 | +using System.IO; |
| 3 | +using System.Linq; |
| 4 | +using FluentAssertions; |
| 5 | + |
| 6 | +namespace Chizl.FileCompare.Tests |
| 7 | +{ |
| 8 | + public class DiffToolTests : IDisposable |
| 9 | + { |
| 10 | + private readonly string _tempDir; |
| 11 | + |
| 12 | + public DiffToolTests() |
| 13 | + { |
| 14 | + _tempDir = Path.Combine(Path.GetTempPath(), "ChizlDiffTests"); |
| 15 | + Directory.CreateDirectory(_tempDir); |
| 16 | + } |
| 17 | + |
| 18 | + public void Dispose() |
| 19 | + { |
| 20 | + if (Directory.Exists(_tempDir)) |
| 21 | + Directory.Delete(_tempDir, true); |
| 22 | + } |
| 23 | + |
| 24 | + private string CreateTempFile(string name, byte[] bytes) |
| 25 | + { |
| 26 | + var path = Path.Combine(_tempDir, name); |
| 27 | + File.WriteAllBytes(path, bytes); |
| 28 | + return path; |
| 29 | + } |
| 30 | + |
| 31 | + private string CreateTempFile(string name, string[] lines) |
| 32 | + { |
| 33 | + var path = Path.Combine(_tempDir, name); |
| 34 | + File.WriteAllLines(path, lines); |
| 35 | + return path; |
| 36 | + } |
| 37 | + |
| 38 | + [Fact] |
| 39 | + public void CompareFiles_IdenticalAscii_ReturnsNoChanges() |
| 40 | + { |
| 41 | + var file1 = CreateTempFile("file1.txt", new[] { "line1", "line2" }); |
| 42 | + var file2 = CreateTempFile("file2.txt", new[] { "line1", "line2" }); |
| 43 | + |
| 44 | + var result = DiffTool.CompareFiles(file1, file2); |
| 45 | + |
| 46 | + result.HasException.Should().BeFalse(); |
| 47 | + result.IsBinary.Should().BeFalse(); |
| 48 | + result.Diffs.Added.Should().Be(0); |
| 49 | + result.Diffs.Deleted.Should().Be(0); |
| 50 | + result.Diffs.Modified.Should().Be(0); |
| 51 | + } |
| 52 | + |
| 53 | + [Fact] |
| 54 | + public void CompareFiles_ModifiedAscii_ReturnsModify() |
| 55 | + { |
| 56 | + var file1 = CreateTempFile("file1.txt", new[] { "using System;", "using IO;" }); |
| 57 | + var file2 = CreateTempFile("file2.txt", new[] { "using System;", "using IO2;" }); |
| 58 | + |
| 59 | + var result = DiffTool.CompareFiles(file1, file2); |
| 60 | + |
| 61 | + result.LineComparison.Any(l => l.DiffType == DiffType.Modified).Should().BeTrue(); |
| 62 | + } |
| 63 | + |
| 64 | + [Fact] |
| 65 | + public void CompareFiles_InsertsAndDeletes_ReturnsCorrectCounts() |
| 66 | + { |
| 67 | + var file1 = CreateTempFile("file1.txt", new[] { "line1", "line2", "line3" }); |
| 68 | + var file2 = CreateTempFile("file2.txt", new[] { "line1", "line2a", "line4" }); |
| 69 | + |
| 70 | + var result = DiffTool.CompareFiles(file1, file2); |
| 71 | + |
| 72 | + result.Diffs.Added.Should().Be(1); // line4 |
| 73 | + result.Diffs.Deleted.Should().Be(1); // line2 -> line2a |
| 74 | + result.Diffs.Modified.Should().Be(1); // merged line2 -> line2a |
| 75 | + } |
| 76 | + |
| 77 | + [Fact] |
| 78 | + public void CompareFiles_BinaryFiles_ReturnsIsBinaryTrue() |
| 79 | + { |
| 80 | + var file1 = CreateTempFile("file1.bin", new byte[] { 0, 1, 2, 3 }); |
| 81 | + var file2 = CreateTempFile("file2.bin", new byte[] { 0, 1, 2, 4 }); |
| 82 | + |
| 83 | + var result = DiffTool.CompareFiles(file1, file2); |
| 84 | + |
| 85 | + result.IsBinary.Should().BeTrue(); |
| 86 | + } |
| 87 | + |
| 88 | + [Fact] |
| 89 | + public void CompareFiles_MissingFile_ThrowsException() |
| 90 | + { |
| 91 | + var file1 = Path.Combine(_tempDir, "doesnotexist.txt"); |
| 92 | + var file2 = CreateTempFile("file2.txt", new[] { "line1" }); |
| 93 | + |
| 94 | + var result = DiffTool.CompareFiles(file1, file2); |
| 95 | + |
| 96 | + result.HasException.Should().BeTrue(); |
| 97 | + result.Exception.Should().BeOfType<ArgumentException>(); |
| 98 | + } |
| 99 | + } |
| 100 | +} |
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