chore: initial git load of code space

tests/Strata.SqlTools.PostgreSql.Tests/PostgreSql/StatementExpressionParserTests.cs

@@ -0,0 +1,357 @@
+using Strata.SqlTools.Statements.PostgreSql;
+
+namespace Strata.SqlTools.SqlBreakdown.Tests.PostgreSql;
+
+[TestFixture]
+public class StatementExpressionParserTests
+{
+    [Test]
+    public void Parse_NumberExpression_ReturnNum()
+    {
+        // Arrange
+        var parser = new StatementExpressionParser();
+        var sql = "42";
+
+        // Act
+        var result = parser.Parse(sql);
+
+        // Assert
+        Assert.That(result, Is.Not.Null);
+    }
+
+    [Test]
+    public void Parse_NegativeNumber_Succeeds()
+    {
+        // Arrange
+        var parser = new StatementExpressionParser();
+        var sql = "-42";
+
+        // Act
+        var result = parser.Parse(sql);
+
+        // Assert
+        Assert.That(result, Is.Not.Null);
+    }
+
+    [Test]
+    public void Parse_DecimalNumber_Succeeds()
+    {
+        // Arrange
+        var parser = new StatementExpressionParser();
+        var sql = "3.14159";
+
+        // Act
+        var result = parser.Parse(sql);
+
+        // Assert
+        Assert.That(result, Is.Not.Null);
+    }
+
+    [Test]
+    public void Parse_StringExpression_ReturnsString()
+    {
+        // Arrange
+        var parser = new StatementExpressionParser();
+        var sql = "'hello world'";
+
+        // Act
+        var result = parser.Parse(sql);
+
+        // Assert
+        Assert.That(result, Is.Not.Null);
+    }
+
+    [Test]
+    public void Parse_StringWithEscapedQuotes_Succeeds()
+    {
+        // Arrange
+        var parser = new StatementExpressionParser();
+        var sql = "'it''s working'"; // PostgreSQL escape style
+
+        // Act
+        var result = parser.Parse(sql);
+
+        // Assert
+        Assert.That(result, Is.Not.Null);
+    }
+
+    [Test]
+    public void Parse_ColumnIdentifier_Succeeds()
+    {
+        // Arrange
+        var parser = new StatementExpressionParser();
+        var sql = "user_id";
+
+        // Act
+        var result = parser.Parse(sql);
+
+        // Assert
+        Assert.That(result, Is.Not.Null);
+    }
+
+    [Test]
+    public void Parse_QuotedIdentifier_Succeeds()
+    {
+        // Arrange
+        var parser = new StatementExpressionParser();
+        var sql = "\"UserId\"";
+
+        // Act
+        var result = parser.Parse(sql);
+
+        // Assert
+        Assert.That(result, Is.Not.Null);
+    }
+
+    [Test]
+    public void Parse_ColumnWithTablePrefix_Succeeds()
+    {
+        // Arrange
+        var parser = new StatementExpressionParser();
+        var sql = "users.id";
+
+        // Act
+        var result = parser.Parse(sql);
+
+        // Assert
+        Assert.That(result, Is.Not.Null);
+    }
+
+    [Test]
+    public void Parse_QuotedColumnWithTablePrefix_Succeeds()
+    {
+        // Arrange
+        var parser = new StatementExpressionParser();
+        var sql = "\"Users\".\"Id\"";
+
+        // Act
+        var result = parser.Parse(sql);
+
+        // Assert
+        Assert.That(result, Is.Not.Null);
+    }
+
+    [Test]
+    public void Parse_SimpleAddition_Succeeds()
+    {
+        // Arrange
+        var parser = new StatementExpressionParser();
+        var sql = "42 + 8";
+
+        // Act
+        var result = parser.Parse(sql);
+
+        // Assert
+        Assert.That(result, Is.Not.Null);
+    }
+
+    [Test]
+    public void Parse_SimpleSubtraction_Succeeds()
+    {
+        // Arrange
+        var parser = new StatementExpressionParser();
+        var sql = "42 - 8";
+
+        // Act
+        var result = parser.Parse(sql);
+
+        // Assert
+        Assert.That(result, Is.Not.Null);
+    }
+
+    [Test]
+    public void Parse_SimpleMultiplication_Succeeds()
+    {
+        // Arrange
+        var parser = new StatementExpressionParser();
+        var sql = "42 * 8";
+
+        // Act
+        var result = parser.Parse(sql);
+
+        // Assert
+        Assert.That(result, Is.Not.Null);
+    }
+
+    [Test]
+    public void Parse_SimpleDivision_Succeeds()
+    {
+        // Arrange
+        var parser = new StatementExpressionParser();
+        var sql = "42 / 8";
+
+        // Act
+        var result = parser.Parse(sql);
+
+        // Assert
+        Assert.That(result, Is.Not.Null);
+    }
+
+    [Test]
+    public void Parse_ComplexArithmeticExpression_Succeeds()
+    {
+        // Arrange
+        var parser = new StatementExpressionParser();
+        var sql = "(42 + 8) * (10 - 2) / 4";
+
+        // Act
+        var result = parser.Parse(sql);
+
+        // Assert
+        Assert.That(result, Is.Not.Null);
+    }
+
+    [Test]
+    public void Parse_FunctionCall_Succeeds()
+    {
+        // Arrange
+        var parser = new StatementExpressionParser();
+        var sql = "COUNT(id)";
+
+        // Act
+        var result = parser.Parse(sql);
+
+        // Assert
+        Assert.That(result, Is.Not.Null);
+    }
+
+    [Test]
+    public void Parse_CountExpression_Succeeds()
+    {
+        // Arrange
+        var parser = new StatementExpressionParser();
+        var sql = "COUNT(*)";
+
+        // Act
+        var result = parser.Parse(sql);
+
+        // Assert
+        Assert.That(result, Is.Not.Null);
+    }
+
+    [Test]
+    public void Parse_SumExpression_Succeeds()
+    {
+        // Arrange
+        var parser = new StatementExpressionParser();
+        var sql = "SUM(amount)";
+
+        // Act
+        var result = parser.Parse(sql);
+
+        // Assert
+        Assert.That(result, Is.Not.Null);
+    }
+
+    [Test]
+    public void Parse_CaseInsensitiveFunctionName_Succeeds()
+    {
+        // Arrange
+        var parser = new StatementExpressionParser();
+        var sql = "sum(amount)";
+
+        // Act
+        var result = parser.Parse(sql);
+
+        // Assert
+        Assert.That(result, Is.Not.Null);
+    }
+
+    [Test]
+    public void Parse_FunctionWithMultipleArguments_Succeeds()
+    {
+        // Arrange
+        var parser = new StatementExpressionParser();
+        var sql = "SUBSTRING(name, 1, 10)";
+
+        // Act
+        var result = parser.Parse(sql);
+
+        // Assert
+        Assert.That(result, Is.Not.Null);
+    }
+
+    [Test]
+    public void Parse_NestedFunctionCalls_Succeeds()
+    {
+        // Arrange
+        var parser = new StatementExpressionParser();
+        var sql = "UPPER(SUBSTRING(name, 1, 10))";
+
+        // Act
+        var result = parser.Parse(sql);
+
+        // Assert
+        Assert.That(result, Is.Not.Null);
+    }
+
+    [Test]
+    public void Parse_ColumnWithAlias_Succeeds()
+    {
+        // Arrange
+        var parser = new StatementExpressionParser();
+        var sql = "COUNT(id) AS total_count";
+
+        // Act
+        var result = parser.Parse(sql);
+
+        // Assert
+        Assert.That(result, Is.Not.Null);
+    }
+
+    [Test]
+    public void Parse_CaseExpression_Succeeds()
+    {
+        // Arrange
+        var parser = new StatementExpressionParser();
+        var sql = "CASE WHEN status = 'active' THEN 1 ELSE 0 END";
+
+        // Act
+        var result = parser.Parse(sql);
+
+        // Assert
+        Assert.That(result, Is.Not.Null);
+    }
+
+    [Test]
+    public void Parse_PostgreSqlPositionalParameter_Succeeds()
+    {
+        // Arrange
+        var parser = new StatementExpressionParser();
+        var sql = "$1";
+
+        // Act
+        var result = parser.Parse(sql);
+
+        // Assert
+        Assert.That(result, Is.Not.Null);
+    }
+
+    [Test]
+    public void Parse_NamedParameter_Succeeds()
+    {
+        // Arrange
+        var parser = new StatementExpressionParser();
+        var sql = "@userId";
+
+        // Act
+        var result = parser.Parse(sql);
+
+        // Assert
+        Assert.That(result, Is.Not.Null);
+    }
+
+    [Test]
+    public void Parse_ColonNamedParameter_Succeeds()
+    {
+        // Arrange
+        var parser = new StatementExpressionParser();
+        var sql = ":userId";
+
+        // Act
+        var result = parser.Parse(sql);
+
+        // Assert
+        Assert.That(result, Is.Not.Null);
+    }
+}