Implement a test for swagger-api#1961

modules/swagger-parser-v3/src/test/java/io/swagger/v3/parser/test/ResolverCacheTestCircular.java

@@ -0,0 +1,16 @@
+import io.swagger.v3.parser.OpenAPIV3Parser;
+import io.swagger.v3.parser.core.models.ParseOptions;
+import io.swagger.v3.parser.core.models.SwaggerParseResult;
+import org.testng.annotations.Test;
+
+import static org.testng.Assert.assertFalse;
+
+public class ResolverCacheTestCircular {
+    @Test
+    public void testIssue1961_DuplicateSchemas_ABA() {
+        ParseOptions parseOptions = new ParseOptions();
+        parseOptions.setResolve(true);
+        SwaggerParseResult result = new OpenAPIV3Parser().readLocation("src/test/resources/issue-1961/Foo.yaml", null, parseOptions);
+        assertFalse(result.getOpenAPI().getComponents().getSchemas().containsKey("TestCase_1"));
+    }
+}

modules/swagger-parser-v3/src/test/resources/issue-1961/Bar.yaml

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+components:
+  schemas:
+    Bar:
+      anyOf:
+      - $ref: ./Foo.yaml#/components/schemas/FooBar
+    BarType:
+      enum:
+      - All
+      - OEM
+      type: string
+info:
+  title: '#Issue1961.Bar'
+openapi: 3.0.1

modules/swagger-parser-v3/src/test/resources/issue-1961/Foo.yaml

@@ -0,0 +1,17 @@
+components:
+  schemas:
+    FooBar:
+      properties:
+        BypassTypes:
+          items:
+            $ref: ./Bar.yaml#/components/schemas/BarType
+          type: array
+      type: object
+    Foo:
+      properties:
+        MFABypass:
+          $ref: ./Bar.yaml#/components/schemas/Bar
+      type: object
+info:
+  title: '#Issue1961.Foo'
+openapi: 3.0.1