update sample tests, fix Java tests (#20300)

* replace removed forkMode

* remove junit runner where it's not needed

* update samples without skipping test files, but skip files named "FILES"

* revert overwriting custom tests, add custom java tests to list

* add one sample to CircleCI, fix various Java tests

samples/client/petstore/java/feign/src/test/java/org/openapitools/client/api/FakeApiTest.java

@@ -14,6 +14,7 @@ import java.time.OffsetDateTime;
 import org.openapitools.client.model.OuterComposite;
 import org.openapitools.client.model.OuterObjectWithEnumProperty;
 import org.openapitools.client.model.Pet;
+import org.openapitools.client.model.TestInlineFreeformAdditionalPropertiesRequest;
 import org.openapitools.client.model.User;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.BeforeEach;
@@ -168,6 +169,20 @@ class FakeApiTest {
     }
 
     
+    /**
+     * test referenced additionalProperties
+     *
+     * 
+     */
+    @Test
+    void testAdditionalPropertiesReferenceTest() {
+        Map<String, Object> requestBody = null;
+        // api.testAdditionalPropertiesReference(requestBody);
+
+        // TODO: test validations
+    }
+
+    
     /**
      * 
      *
@@ -369,6 +384,20 @@ class FakeApiTest {
     }
 
     
+    /**
+     * test inline free-form additionalProperties
+     *
+     * 
+     */
+    @Test
+    void testInlineFreeformAdditionalPropertiesTest() {
+        TestInlineFreeformAdditionalPropertiesRequest testInlineFreeformAdditionalPropertiesRequest = null;
+        // api.testInlineFreeformAdditionalProperties(testInlineFreeformAdditionalPropertiesRequest);
+
+        // TODO: test validations
+    }
+
+    
     /**
      * test json serialization of form data
      *
@@ -440,4 +469,18 @@ class FakeApiTest {
     // TODO: test validations
     }
     
+    /**
+     * test referenced string map
+     *
+     * 
+     */
+    @Test
+    void testStringMapReferenceTest() {
+        Map<String, String> requestBody = null;
+        // api.testStringMapReference(requestBody);
+
+        // TODO: test validations
+    }
+
+    
 }