From 678ba2bb964bbf81b8116543a958e0ebd9c2a8df Mon Sep 17 00:00:00 2001
From: Vincent Biret <vibiret@microsoft.com>
Date: Tue, 26 Nov 2024 14:23:47 -0500
Subject: [PATCH] chore: adds unit test to prevent regression on discriminator
 infinite loop

---
 .../OpenApiSchemaExtensionsTests.cs           | 55 +++++++++++++++++++
 1 file changed, 55 insertions(+)

diff --git a/tests/Kiota.Builder.Tests/Extensions/OpenApiSchemaExtensionsTests.cs b/tests/Kiota.Builder.Tests/Extensions/OpenApiSchemaExtensionsTests.cs
index d0c7a81f9f..620d11d79f 100644
--- a/tests/Kiota.Builder.Tests/Extensions/OpenApiSchemaExtensionsTests.cs
+++ b/tests/Kiota.Builder.Tests/Extensions/OpenApiSchemaExtensionsTests.cs
@@ -847,4 +847,59 @@ public void IsOdataPrimitiveBackwardCompatible()
         };
         Assert.True(schema.IsODataPrimitiveType());
     }
+    [Fact]
+    public void ReturnsEmptyPropertyNameOnCircularReferences()
+    {
+        var entitySchema = new OpenApiSchema
+        {
+            Reference = new OpenApiReference
+            {
+                Id = "microsoft.graph.entity"
+            },
+            Properties = new Dictionary<string, OpenApiSchema>
+            {
+                ["id"] = new OpenApiSchema
+                {
+                    Reference = new OpenApiReference
+                    {
+                        Id = "microsoft.graph.entity"
+                    }
+                }
+            }
+        };
+        var userSchema = new OpenApiSchema
+        {
+            Reference = new OpenApiReference
+            {
+                Id = "microsoft.graph.user"
+            },
+            OneOf =
+            [
+                entitySchema,
+                new OpenApiSchema {
+                    Type = "object",
+                    Properties = new Dictionary<string, OpenApiSchema> {
+                        ["firstName"] = new OpenApiSchema {
+                            Reference = new OpenApiReference {
+                                Id = "microsoft.graph.entity"
+                            }
+                        }
+                    }
+                }
+            ],
+            Discriminator = new OpenApiDiscriminator
+            {
+                Mapping = new Dictionary<string, string>
+                {
+                    ["microsoft.graph.entity"] = "entity",
+                    ["microsoft.graph.user"] = "user"
+                }
+            }
+        };
+        entitySchema.AllOf =
+        [
+            userSchema
+        ];
+        Assert.Empty(userSchema.GetDiscriminatorPropertyName());
+    }
 }