chore: import upstream snapshot with attribution

dotnet/tests/Microsoft.Agents.AI.Workflows.Declarative.UnitTests/PowerFx/TemplateExtensionsTests.cs

@@ -0,0 +1,139 @@
+// Copyright (c) Microsoft. All rights reserved.
+
+using System.Collections.Generic;
+using Microsoft.Agents.AI.Workflows.Declarative.Extensions;
+using Microsoft.Agents.ObjectModel;
+using Microsoft.PowerFx.Types;
+
+namespace Microsoft.Agents.AI.Workflows.Declarative.UnitTests.PowerFx;
+
+public class TemplateExtensionsTests(ITestOutputHelper output) : RecalcEngineTest(output)
+{
+    [Fact]
+    public void FormatTemplateLines()
+    {
+        // Arrange
+        List<TemplateLine> template =
+        [
+            TemplateLine.Parse("Hello"),
+            TemplateLine.Parse(" "),
+            TemplateLine.Parse("World"),
+        ];
+
+        // Act
+        string? result = this.Engine.Format(template);
+
+        // Assert
+        Assert.Equal("Hello World", result);
+    }
+
+    [Fact]
+    public void FormatTemplateLinesEmpty()
+    {
+        // Arrange
+        List<TemplateLine> template = [];
+
+        // Act
+        string? result = this.Engine.Format(template);
+
+        // Assert
+        Assert.Equal(string.Empty, result);
+    }
+
+    [Fact]
+    public void FormatTemplateLine()
+    {
+        // Arrange
+        TemplateLine line = TemplateLine.Parse("Test");
+
+        // Act
+        string? result = this.Engine.Format(line);
+
+        // Assert
+        Assert.Equal("Test", result);
+    }
+
+    [Fact]
+    public void FormatTemplateLineNull()
+    {
+        // Arrange
+        TemplateLine? line = null;
+
+        // Act
+        string? result = this.Engine.Format(line);
+
+        // Assert
+        Assert.Equal(string.Empty, result);
+    }
+
+    [Fact]
+    public void FormatTextSegment()
+    {
+        // Arrange
+        TemplateSegment textSegment = TemplateSegment.FromText("Hello World");
+        TemplateLine line = new([textSegment]);
+
+        // Act
+        string? result = this.Engine.Format(line);
+
+        // Assert
+        Assert.Equal("Hello World", result);
+    }
+
+    [Fact]
+    public void FormatExpressionSegment()
+    {
+        // Arrange
+        ExpressionSegment expressionSegment = new(ValueExpression.Expression("1 + 1"));
+        TemplateLine line = new([expressionSegment]);
+
+        // Act
+        string? result = this.Engine.Format(line);
+
+        // Assert
+        Assert.Equal("2", result);
+    }
+
+    [Fact]
+    public void FormatVariableSegment()
+    {
+        // Arrange
+        this.State.Set("Source", FormulaValue.New("Hello World"));
+        this.State.Bind();
+
+        ExpressionSegment expressionSegment = new(ValueExpression.Variable(PropertyPath.TopicVariable("Source")));
+        TemplateLine line = new([expressionSegment]);
+
+        // Act
+        string? result = this.Engine.Format(line);
+
+        // Assert
+        Assert.Equal("Hello World", result);
+    }
+
+    [Fact]
+    public void FormatExpressionSegmentUndefined()
+    {
+        // Arrange
+        ExpressionSegment expressionSegment = new();
+        TemplateLine line = new([expressionSegment]);
+
+        // Act & Assert
+        Assert.Throws<DeclarativeModelException>(() => this.Engine.Format(line));
+    }
+
+    [Fact]
+    public void FormatMultipleSegments()
+    {
+        // Arrange
+        TemplateSegment textSegment = TemplateSegment.FromText("Hello ");
+        ExpressionSegment expressionSegment = new(ValueExpression.Expression(@"""World"""));
+        TemplateLine line = new([textSegment, expressionSegment]);
+
+        // Act
+        string? result = this.Engine.Format(line);
+
+        // Assert
+        Assert.Equal("Hello World", result);
+    }
+}