add a test for generateParameterId (#20256)

modules/openapi-generator/src/test/java/org/openapitools/codegen/java/JavaClientCodegenTest.java

@@ -3210,4 +3210,28 @@ public class JavaClientCodegenTest {
         );
     }
 
-}
+    @Test
+    public void testGenerateParameterId() {
+        final Path output = newTempFolder();
+        final CodegenConfigurator configurator = new CodegenConfigurator()
+                .setValidateSpec(false)
+                .setGeneratorName("java")
+                .setAdditionalProperties(Map.of(
+                        CodegenConstants.API_PACKAGE, "xyz.abcdef.api"
+                ))
+                .setInputSpec("src/test/resources/3_1/issue_20239.yaml")
+                .setOutputDir(output.toString().replace("\\", "/"));
+
+        new DefaultGenerator().opts(configurator.toClientOptInput()).generate();
+
+        TestUtils.assertFileContains(
+                output.resolve("src/main/java/xyz/abcdef/api/ATagApi.java"),
+                " getCall(String pathParameter, Integer queryParameter, final ApiCallback _callback)"
+        );
+
+        TestUtils.assertFileNotContains(
+                output.resolve("src/main/java/xyz/abcdef/api/ATagApi.java"),
+                " getCall(Integer queryParameter, final ApiCallback _callback)"
+        );
+    }
+}

modules/openapi-generator/src/test/resources/3_1/issue_20239.yaml

@@ -0,0 +1,38 @@
+openapi: 3.1.0
+info:
+  title: API Overview 
+  version: "v1"
+  description: description
+
+tags:
+  - name: aTag
+
+paths:
+  "/path/{path_parameter}":
+    parameters:
+      - $ref: "#/components/parameters/path_parameter"
+    get:
+      tags:
+      - aTag    
+      operationId: get
+      parameters:
+      - $ref: "#/components/parameters/query_parameter"  
+      responses:
+        "200":
+          description: no body
+components:
+  parameters:
+    path_parameter:
+      name: path_parameter
+      in: path
+      required: true
+      schema:
+        type: string
+
+    query_parameter:
+      name: query_parameter
+      in: query
+      schema:
+        type: integer
+        minimum: 0
+        default: 0