Initial commit to new repository

src/AxCopilot.Tests/Handlers/ClipboardTransformTests.cs

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+using System.Text;
+using FluentAssertions;
+using AxCopilot.Handlers;
+using Xunit;
+
+namespace AxCopilot.Tests.Handlers;
+
+public class ClipboardTransformTests
+{
+    // ─── 대소문자 변환 ────────────────────────────────────────────────────────
+
+    [Fact]
+    public void Upper_ConvertsToUppercase()
+    {
+        ClipboardHandler.ExecuteBuiltin("$upper", "hello world").Should().Be("HELLO WORLD");
+    }
+
+    [Fact]
+    public void Lower_ConvertsToLowercase()
+    {
+        ClipboardHandler.ExecuteBuiltin("$lower", "HELLO WORLD").Should().Be("hello world");
+    }
+
+    // ─── Base64 ──────────────────────────────────────────────────────────────
+
+    [Fact]
+    public void Base64Encode_EncodesCorrectly()
+    {
+        ClipboardHandler.ExecuteBuiltin("$b64e", "hello").Should().Be("aGVsbG8=");
+    }
+
+    [Fact]
+    public void Base64Decode_DecodesCorrectly()
+    {
+        ClipboardHandler.ExecuteBuiltin("$b64d", "aGVsbG8=").Should().Be("hello");
+    }
+
+    [Fact]
+    public void Base64_RoundTrip()
+    {
+        var original = "AX Copilot 테스트";
+        var encoded = ClipboardHandler.ExecuteBuiltin("$b64e", original)!;
+        var decoded = ClipboardHandler.ExecuteBuiltin("$b64d", encoded);
+        decoded.Should().Be(original);
+    }
+
+    // ─── URL 인코딩 ──────────────────────────────────────────────────────────
+
+    [Fact]
+    public void UrlEncode_EncodesSpaces()
+    {
+        ClipboardHandler.ExecuteBuiltin("$urle", "hello world").Should().Be("hello%20world");
+    }
+
+    [Fact]
+    public void UrlDecode_DecodesSpaces()
+    {
+        ClipboardHandler.ExecuteBuiltin("$urld", "hello%20world").Should().Be("hello world");
+    }
+
+    [Fact]
+    public void UrlEncode_EncodesSpecialChars()
+    {
+        var result = ClipboardHandler.ExecuteBuiltin("$urle", "a=b&c=d");
+        result.Should().Be("a%3Db%26c%3Dd");
+    }
+
+    [Fact]
+    public void UrlDecode_DecodesSpecialChars()
+    {
+        var result = ClipboardHandler.ExecuteBuiltin("$urld", "a%3Db%26c%3Dd");
+        result.Should().Be("a=b&c=d");
+    }
+
+    // ─── 문자열 처리 ─────────────────────────────────────────────────────────
+
+    [Fact]
+    public void Trim_RemovesLeadingTrailingWhitespace()
+    {
+        ClipboardHandler.ExecuteBuiltin("$trim", "  hello  ").Should().Be("hello");
+    }
+
+    [Fact]
+    public void Trim_PreservesInternalSpaces()
+    {
+        ClipboardHandler.ExecuteBuiltin("$trim", "  hello world  ").Should().Be("hello world");
+    }
+
+    [Fact]
+    public void Lines_RemovesEmptyLines()
+    {
+        var input = "a\n\nb\n  \nc";
+        var result = ClipboardHandler.ExecuteBuiltin("$lines", input);
+        result.Should().NotContain("\n\n");
+        result.Should().Contain("a");
+        result.Should().Contain("b");
+        result.Should().Contain("c");
+    }
+
+    [Fact]
+    public void Lines_TrimsEachLine()
+    {
+        var input = "  hello  \n  world  ";
+        var result = ClipboardHandler.ExecuteBuiltin("$lines", input)!;
+        result.Should().Contain("hello");
+        result.Should().Contain("world");
+        result.Should().NotContain("  hello");
+    }
+
+    // ─── 타임스탬프 ──────────────────────────────────────────────────────────
+
+    [Fact]
+    public void Timestamp_EpochZero_Returns1970()
+    {
+        var result = ClipboardHandler.ExecuteBuiltin("$ts", "0");
+        result.Should().NotBeNullOrEmpty();
+        result.Should().Contain("1970");
+    }
+
+    [Fact]
+    public void Timestamp_ValidEpoch_ReturnsDateString()
+    {
+        var result = ClipboardHandler.ExecuteBuiltin("$ts", "1700000000");
+        result.Should().NotBeNullOrEmpty();
+        result.Should().MatchRegex(@"\d{4}-\d{2}-\d{2}");
+    }
+
+    [Fact]
+    public void Timestamp_InvalidInput_ReturnsNull()
+    {
+        ClipboardHandler.ExecuteBuiltin("$ts", "not-a-number").Should().BeNull();
+    }
+
+    [Fact]
+    public void Epoch_ValidDate_ReturnsNumber()
+    {
+        var result = ClipboardHandler.ExecuteBuiltin("$epoch", "1970-01-01");
+        result.Should().NotBeNullOrEmpty();
+        long.TryParse(result, out _).Should().BeTrue();
+    }
+
+    [Fact]
+    public void Epoch_InvalidDate_ReturnsNull()
+    {
+        ClipboardHandler.ExecuteBuiltin("$epoch", "not-a-date").Should().BeNull();
+    }
+
+    // ─── JSON 포맷팅 ─────────────────────────────────────────────────────────
+
+    [Fact]
+    public void JsonFormat_MinifiedJson_AddsIndentation()
+    {
+        var result = ClipboardHandler.ExecuteBuiltin("$json", "{\"a\":1,\"b\":2}");
+        result.Should().NotBeNullOrEmpty();
+        result.Should().Contain("\n");
+        result.Should().Contain("\"a\"");
+    }
+
+    [Fact]
+    public void JsonFormat_AlreadyFormatted_StaysValid()
+    {
+        var formatted = "{\n  \"a\": 1\n}";
+        var result = ClipboardHandler.ExecuteBuiltin("$json", formatted);
+        result.Should().NotBeNullOrEmpty();
+        result.Should().Contain("\"a\"");
+    }
+
+    [Fact]
+    public void JsonFormat_InvalidJson_ReturnsOriginal()
+    {
+        var invalid = "not json";
+        var result = ClipboardHandler.ExecuteBuiltin("$json", invalid);
+        result.Should().Be(invalid); // 파싱 실패 시 원본 반환
+    }
+
+    // ─── 마크다운 제거 ───────────────────────────────────────────────────────
+
+    [Fact]
+    public void StripMarkdown_RemovesBold()
+    {
+        var result = ClipboardHandler.ExecuteBuiltin("$md", "**bold text**");
+        result.Should().NotContain("**");
+        result.Should().Contain("bold text");
+    }
+
+    [Fact]
+    public void StripMarkdown_RemovesItalic()
+    {
+        var result = ClipboardHandler.ExecuteBuiltin("$md", "*italic*");
+        result.Should().NotContain("*italic*");
+        result.Should().Contain("italic");
+    }
+
+    [Fact]
+    public void StripMarkdown_RemovesInlineCode()
+    {
+        var result = ClipboardHandler.ExecuteBuiltin("$md", "`code`");
+        result.Should().NotContain("`");
+        result.Should().Contain("code");
+    }
+
+    // ─── 알 수 없는 키 ──────────────────────────────────────────────────────
+
+    [Fact]
+    public void UnknownKey_ReturnsNull()
+    {
+        ClipboardHandler.ExecuteBuiltin("$unknown", "input").Should().BeNull();
+    }
+
+    [Fact]
+    public void EmptyKey_ReturnsNull()
+    {
+        ClipboardHandler.ExecuteBuiltin("", "input").Should().BeNull();
+    }
+}