stabilizaiton work - projects rework for maintenanceability and ui livening

src/__Libraries/StellaOps.Canonical.Json.Tests/CanonVersionTests.IsVersioned.cs

@@ -0,0 +1,47 @@
+using StellaOps.TestKit;
+using Xunit;
+
+namespace StellaOps.Canonical.Json.Tests;
+
+public partial class CanonVersionTests
+{
+    [Trait("Category", TestCategories.Unit)]
+    [Fact]
+    public void IsVersioned_VersionedJson_ReturnsTrue()
+    {
+        var json = """{"_canonVersion":"stella:canon:v1","foo":"bar"}"""u8;
+        Assert.True(CanonVersion.IsVersioned(json));
+    }
+
+    [Trait("Category", TestCategories.Unit)]
+    [Fact]
+    public void IsVersioned_LegacyJson_ReturnsFalse()
+    {
+        var json = """{"foo":"bar"}"""u8;
+        Assert.False(CanonVersion.IsVersioned(json));
+    }
+
+    [Trait("Category", TestCategories.Unit)]
+    [Fact]
+    public void IsVersioned_EmptyJson_ReturnsFalse()
+    {
+        var json = "{}"u8;
+        Assert.False(CanonVersion.IsVersioned(json));
+    }
+
+    [Trait("Category", TestCategories.Unit)]
+    [Fact]
+    public void IsVersioned_TooShort_ReturnsFalse()
+    {
+        var json = """{"_ca":"v"}"""u8;
+        Assert.False(CanonVersion.IsVersioned(json));
+    }
+
+    [Trait("Category", TestCategories.Unit)]
+    [Fact]
+    public void IsVersioned_WrongFieldName_ReturnsFalse()
+    {
+        var json = """{"_version":"stella:canon:v1","foo":"bar"}"""u8;
+        Assert.False(CanonVersion.IsVersioned(json));
+    }
+}