better java resteasy echo api client tests (#17473)

.github/workflows/samples-java-client-echo-api-jdk11.yaml

@@ -20,6 +20,7 @@ jobs:
           - samples/client/echo_api/java/native
           - samples/client/echo_api/java/feign-gson
           - samples/client/echo_api/java/resttemplate
+          - samples/client/echo_api/java/resteasy
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-java@v4

.github/workflows/samples-java-client-echo-api-jdk8.yaml

@@ -7,12 +7,13 @@ on:
       - samples/client/echo_api/java/feign-gson/**
       - samples/client/echo_api/java/okhttp-gson/**
       - samples/client/echo_api/java/resttemplate/**
+      - samples/client/echo_api/java/resteasy/**
   pull_request:
     paths:
       - samples/client/echo_api/java/apache-httpclient/**
       - samples/client/echo_api/java/feign-gson/**
       - samples/client/echo_api/java/okhttp-gson/**
-      - samples/client/echo_api/java/resttemplate/**
+      - samples/client/echo_api/java/resteasy/**
 jobs:
   build:
     name: Build Java Client JDK8
@@ -26,6 +27,7 @@ jobs:
           - samples/client/echo_api/java/feign-gson
           - samples/client/echo_api/java/okhttp-gson
           - samples/client/echo_api/java/resttemplate
+          - samples/client/echo_api/java/resteasy
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-java@v4

bin/configs/java-resteasy-echo-api.yaml

@@ -1,5 +1,5 @@
 generatorName: java
-outputDir: samples/client/petstore/java/resteasy-echo
+outputDir: samples/client/echo_api/java/resteasy
 inputSpec: modules/openapi-generator/src/test/resources/3_0/echo_api.yaml
 templateDir: modules/openapi-generator/src/main/resources/Java
 additionalProperties:

samples/client/echo_api/java/resteasy/src/test/java/org/openapitools/client/CustomTest.java

@@ -0,0 +1,73 @@
+/*
+ * Echo Server API
+ * Echo Server API
+ *
+ * The version of the OpenAPI document: 0.1.0
+ * Contact: team@openapitools.org
+ *
+ * NOTE: This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).
+ * https://openapi-generator.tech
+ * Do not edit the class manually.
+ */
+
+
+package org.openapitools.client.api;
+
+import org.openapitools.client.ApiException;
+import java.io.File;
+import org.openapitools.client.model.Pet;
+import org.openapitools.client.model.Tag;
+import org.junit.Test;
+import org.junit.Ignore;
+import org.junit.Assert;
+
+import java.io.FileWriter;
+import java.io.IOException;
+import java.time.LocalDate;
+import java.time.OffsetDateTime;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import static org.hamcrest.CoreMatchers.containsString;
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.junit.Assert.assertTrue;
+
+/**
+ * API tests
+ */
+public class CustomTest {
+
+    private final BodyApi api = new BodyApi();
+
+    /**
+     * Test single binary in multipart mime
+     *
+     * @see
+     * <a href="https://github.com/OpenAPITools/openapi-generator/issues/17367">#17367</a>
+     */
+    @Test
+    public void testBodyMultipartFormdataSingleBinaryTest() throws ApiException, IOException {
+        File myFile = new File("test.txt");
+        if (!myFile.exists()){
+            assertTrue(myFile.createNewFile());
+        }
+        FileWriter fw = new FileWriter(myFile);
+        fw.write("testing only");
+        fw.close();
+        myFile.deleteOnExit();
+
+        String response =
+                api.testBodyMultipartFormdataSingleBinary(myFile);
+
+        EchoServerResponseParser parser =
+                new EchoServerResponseParser(response);
+
+        String contentDisposition = parser.headers.get("Content-Disposition");
+
+        assertThat(contentDisposition, containsString(
+                "form-data; name=\"my-file\"; filename=\"test.txt\""
+        ));
+    }
+}