Fixed the Agenda Planner and ERI Server assistants losing parts of your input (#1142)

app/Tests/Assistants/ERI/ERIServerFilesTests.cs

@@ -0,0 +1,88 @@
+using AIStudio.Assistants.ERI;
+
+namespace AIStudio.Tests.Assistants.ERI;
+
+/// <summary>
+/// Checks how the ERI Server assistant reads the files of a server out of the answers of the model.
+/// </summary>
+/// <remarks>
+/// Up to v26.10.1, a file such as docker-compose.yml never reached the disk: the regular expression which
+/// read its content expected a heading without a hyphen, and the file only showed up in the log. The same
+/// expression read up to the last fence of an answer, so a usage example after the file ended up in it.
+/// </remarks>
+[TestFixture]
+public sealed class ERIServerFilesTests
+{
+    private const string COMPOSE_FILE = "services:\n  eri:\n    build: .\n    ports:\n      - \"8080:8080\"\n";
+
+    [TestCase("## docker-compose.yml", TestName = "A heading with a hyphen")]
+    [TestCase("## `docker-compose.yml`", TestName = "A heading with the path in backticks")]
+    [TestCase("### File: deploy/my-server/docker-compose.yml", TestName = "A heading with a label in front of the path")]
+    [TestCase("Here is the file:", TestName = "No heading at all")]
+    public void TheContentIsReadWhateverStandsAboveIt(string introduction)
+    {
+        var answer = Answer(introduction, string.Empty, "```yaml", COMPOSE_FILE.TrimEnd('\n'), "```");
+
+        Assert.That(ERIServerFiles.ReadFileContent(answer), Is.EqualTo(COMPOSE_FILE));
+    }
+
+    [Test]
+    public void ACodeBlockAfterTheFileStaysOutOfIt()
+    {
+        var answer = Answer(
+            "## main.py",
+            string.Empty,
+            "```python",
+            "print('ERI server')",
+            "```",
+            string.Empty,
+            "Start the server with:",
+            string.Empty,
+            "```bash",
+            "python main.py",
+            "```");
+
+        Assert.That(ERIServerFiles.ReadFileContent(answer), Is.EqualTo("print('ERI server')\n"));
+    }
+
+    [Test]
+    public void AFileWithCodeBlocksOfItsOwnStaysWholeInALongerFence()
+    {
+        var answer = Answer(
+            "## README.md",
+            string.Empty,
+            "````markdown",
+            "# ERI Server",
+            string.Empty,
+            "```bash",
+            "python main.py",
+            "```",
+            "````");
+
+        Assert.That(ERIServerFiles.ReadFileContent(answer), Is.EqualTo("# ERI Server\n\n```bash\npython main.py\n```\n"));
+    }
+
+    [Test]
+    public void AFenceOfTildesIsReadAsWell()
+    {
+        var answer = Answer("## main.py", "~~~python", "print('ERI server')", "~~~");
+
+        Assert.That(ERIServerFiles.ReadFileContent(answer), Is.EqualTo("print('ERI server')\n"));
+    }
+
+    [Test]
+    public void ACodeBlockWhichBreaksOffIsNoFile()
+    {
+        var answer = Answer("## main.py", "```python", "print('ERI server')");
+
+        Assert.That(ERIServerFiles.ReadFileContent(answer), Is.Empty);
+    }
+
+    [Test]
+    public void AnAnswerWithoutACodeBlockIsNoFile()
+    {
+        Assert.That(ERIServerFiles.ReadFileContent("I cannot create this file."), Is.Empty);
+    }
+
+    private static string Answer(params string[] lines) => string.Join('\n', lines);
+}