consolidate the tests locations

src/__Tests/reachability/StellaOps.Reachability.FixtureTests/FixtureCoverageTests.cs

@@ -0,0 +1,56 @@
+using System.Text.Json;
+using FluentAssertions;
+using Xunit;
+
+namespace StellaOps.Reachability.FixtureTests;
+
+public sealed class FixtureCoverageTests
+{
+    private static readonly string RepoRoot = ReachbenchFixtureTests.LocateRepoRoot();
+    private static readonly string ReachabilityRoot = Path.Combine(RepoRoot, "tests", "reachability");
+    private static readonly string CorpusRoot = Path.Combine(ReachabilityRoot, "corpus");
+    private static readonly string SamplesPublicRoot = Path.Combine(ReachabilityRoot, "samples-public");
+
+    [Fact]
+    public void CorpusAndPublicSamplesCoverExpectedLanguageBuckets()
+    {
+        var corpusLanguages = ReadManifestLanguages(Path.Combine(CorpusRoot, "manifest.json"));
+        corpusLanguages.Should().Contain(new[] { "dotnet", "go", "python", "rust" });
+
+        var samplesLanguages = ReadManifestLanguages(Path.Combine(SamplesPublicRoot, "manifest.json"));
+        samplesLanguages.Should().Contain(new[] { "csharp", "js", "php" });
+    }
+
+    [Fact]
+    public void CorpusManifestIsSorted()
+    {
+        var keys = ReadManifestKeys(Path.Combine(CorpusRoot, "manifest.json"));
+        keys.Should().NotBeEmpty("corpus manifest should have entries");
+        keys.Should().BeInAscendingOrder(StringComparer.Ordinal);
+    }
+
+    private static string[] ReadManifestLanguages(string manifestPath)
+    {
+        File.Exists(manifestPath).Should().BeTrue($"{manifestPath} should exist");
+
+        using var doc = JsonDocument.Parse(File.ReadAllBytes(manifestPath));
+        return doc.RootElement.EnumerateArray()
+            .Select(entry => entry.GetProperty("language").GetString())
+            .Where(language => !string.IsNullOrWhiteSpace(language))
+            .Select(language => language!)
+            .Distinct(StringComparer.Ordinal)
+            .OrderBy(language => language, StringComparer.Ordinal)
+            .ToArray();
+    }
+
+    private static string[] ReadManifestKeys(string manifestPath)
+    {
+        File.Exists(manifestPath).Should().BeTrue($"{manifestPath} should exist");
+
+        using var doc = JsonDocument.Parse(File.ReadAllBytes(manifestPath));
+        return doc.RootElement.EnumerateArray()
+            .Select(entry => $"{entry.GetProperty("language").GetString()}/{entry.GetProperty("id").GetString()}")
+            .ToArray();
+    }
+}
+