chore: initial git load of code space

tests/Strata.SqlTools.Markdown.Tests/SqlServer/QueryBreakdownGeneratorTests.cs

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+using Strata.SqlTools.Breakdowns.SqlServer;
+using Strata.SqlTools.Markdown.SqlServer;
+using Interfaces = Strata.SqlTools.SqlBreakdown.Interfaces;
+
+namespace Strata.SqlTools.Markdown.Tests.SqlServer;
+
+[TestFixture]
+public class QueryBreakdownGeneratorTests
+{
+    private QueryBreakdownGenerator _generator = null!;
+
+    [SetUp]
+    public void Setup()
+    {
+        _generator = new QueryBreakdownGenerator();
+    }
+
+    [Test]
+    public void GenerateMermaidDiagram_WithSimpleQuery_GeneratesFlowchart()
+    {
+        // Arrange
+        var query = new QueryBreakdown("ID, Name", "Users");
+
+        // Act
+        var result = _generator.GenerateMermaidDiagram(query);
+
+        // Assert
+        Assert.That(result, Does.Contain("```mermaid"));
+        Assert.That(result, Does.Contain("flowchart TD"));
+        Assert.That(result, Does.Contain("SELECT"));
+        Assert.That(result, Does.Contain("FROM"));
+        Assert.That(result, Does.Contain("```"));
+    }
+
+    [Test]
+    public void GenerateMermaidDiagram_WithComplexQuery_IncludesAllClauses()
+    {
+        // Arrange
+        var query = new QueryBreakdown(
+            "u.ID, u.Name, COUNT(o.OrderID) as OrderCount",
+            "Users u JOIN Orders o ON u.ID = o.UserID",
+            "u.Active = 1"
+        );
+        query.GroupByClause.Clause = "u.ID, u.Name";
+        query.HavingClause.Clause = "COUNT(o.OrderID) > 5";
+        query.OrderByClause.Clause = "OrderCount DESC";
+
+        // Act
+        var result = _generator.GenerateMermaidDiagram(query, "User Orders Query");
+
+        // Assert
+        Assert.That(result, Does.Contain("### User Orders Query"));
+        Assert.That(result, Does.Contain("SELECT"));
+        Assert.That(result, Does.Contain("FROM"));
+        Assert.That(result, Does.Contain("WHERE"));
+        Assert.That(result, Does.Contain("GROUP BY"));
+        Assert.That(result, Does.Contain("HAVING"));
+        Assert.That(result, Does.Contain("ORDER BY"));
+    }
+
+    [Test]
+    public void GenerateMermaidDiagram_WithWhereClause_UsesDecisionShape()
+    {
+        // Arrange
+        var query = new QueryBreakdown("*", "Products", "Price > 100");
+
+        // Act
+        var result = _generator.GenerateMermaidDiagram(query);
+
+        // Assert
+        Assert.That(result, Does.Contain("WHERE"));
+        Assert.That(result, Does.Contain("{"));
+        Assert.That(result, Does.Contain("}"));
+    }
+
+    [Test]
+    public void GenerateMermaidDiagram_ParsedQuery_GeneratesDiagram()
+    {
+        // Arrange
+        var sql = @"
+            SELECT u.ID, u.Name, u.Email
+            FROM Users u
+            WHERE u.Active = 1
+            ORDER BY u.Name";
+
+        var query = QueryBreakdown.Parse(sql);
+
+        // Act
+        var result = _generator.GenerateMermaidDiagram(query);
+
+        // Assert
+        Assert.That(result, Is.Not.Null);
+        Assert.That(result, Does.Contain("mermaid"));
+        Assert.That(result, Does.Contain("SELECT"));
+        Assert.That(result.Length, Is.GreaterThan(100));
+    }
+
+    [Test]
+    public void GenerateMermaidDiagram_WithTitle_IncludesTitle()
+    {
+        // Arrange
+        var query = new QueryBreakdown("*", "Users");
+
+        // Act
+        var result = _generator.GenerateMermaidDiagram(query, "Test Query");
+
+        // Assert
+        Assert.That(result, Does.StartWith("### Test Query"));
+    }
+
+    [Test]
+    public void GenerateMermaidDiagram_WithoutTitle_NoTitle()
+    {
+        // Arrange
+        var query = new QueryBreakdown("*", "Users");
+
+        // Act
+        var result = _generator.GenerateMermaidDiagram(query);
+
+        // Assert
+        Assert.That(result, Does.Not.StartWith("###"));
+        Assert.That(result, Does.StartWith("```mermaid"));
+    }
+
+    [Test]
+    public void GenerateMermaidDiagram_WithLongClause_TruncatesText()
+    {
+        // Arrange
+        var longSelect = string.Join(", ", Enumerable.Range(1, 50).Select(i => $"Column{i}"));
+        var query = new QueryBreakdown(longSelect, "LargeTable");
+
+        // Act
+        var result = _generator.GenerateMermaidDiagram(query);
+
+        // Assert
+        Assert.That(result, Does.Contain("..."));
+    }
+
+    [Test]
+    public void GenerateMermaidDiagram_ISqlBreakdown_GeneratesSimpleDiagram()
+    {
+        // Arrange
+        var query = new QueryBreakdown("*", "Users");
+        query.SetupClauses.Add("CREATE TEMP TABLE #Temp (ID INT)");
+
+        // Act
+        var result = _generator.GenerateMermaidDiagram((Interfaces.ISqlBreakdown)query);
+
+        // Assert
+        Assert.That(result, Does.Contain("mermaid"));
+        Assert.That(result, Does.Contain("flowchart TD"));
+        Assert.That(result, Does.Contain("Users"));
+    }
+}