Add import java.io.InputStream to generated api client class

Fixed #1223

Author: altro3

openapi-generator/src/main/java/io/micronaut/openapi/generator/JavaMicronautClientCodegen.java

@@ -63,6 +63,7 @@ public class JavaMicronautClientCodegen extends AbstractMicronautJavaCodegen<Jav
 
         typeMapping.put("file", "byte[]");
         typeMapping.put("responseFile", "InputStream");
+        importMapping.put("InputStream", "java.io.InputStream");
     }
 
     @Override

openapi-generator/src/test/java/io/micronaut/openapi/generator/MicronautClientCodegenTest.java

@@ -291,4 +291,14 @@ void testDiscriminatorConstructorBug() {
         assertFileContains(apiPath + "BasicBookInfo.java", "public BasicBookInfo(String author, String name)", "super(name)");
         assertFileContains(apiPath + "DetailedBookInfo.java", "public DetailedBookInfo(String isbn, String name, String author)", "super(author, name)");
     }
+
+    @Test
+    void testWrongImportInputStream() {
+
+        var codegen = new JavaMicronautClientCodegen();
+        String outputPath = generateFiles(codegen, "src/test/resources/3_0/inputStream.yml", CodegenConstants.APIS, CodegenConstants.API_TESTS);
+        String apiPath = outputPath + "src/main/java/org/openapitools/api/";
+
+        assertFileContains(apiPath + "DefaultApi.java", "import java.io.InputStream;");
+    }
 }

openapi-generator/src/test/resources/3_0/inputStream.yml

@@ -0,0 +1,24 @@
+openapi: "3.0.3"
+info:
+  version: "v1"
+  title: "Dummy"
+paths:
+  /assets:export:
+    get:
+      operationId: "Dummy"
+      description: ""
+      parameters:
+        - name: "query"
+          in: "query"
+          description: ""
+          required: false
+          schema:
+            type: "string"
+      responses:
+        "200":
+          description: ""
+          content:
+            '*/*':
+              schema:
+                type: "string"
+                format: "binary"