feat: Update testing package with more test features

Resolves #14 (closed)

Added request/response format validation, custom status code validation

testing/src/main/java/org/eclipsefoundation/testing/helpers/TestCaseHelper.java

+/**
+ * Copyright (c) 2022 Eclipse Foundation and others.
+ *
+ * This program and the accompanying materials are made
+ * available under the terms of the Eclipse Public License 2.0
+ * which is available at https://www.eclipse.org/legal/epl-2.0/
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ */
+package org.eclipsefoundation.testing.helpers;
+
+import java.util.Optional;
+
+import org.eclipsefoundation.testing.templates.RestAssuredTemplates.EndpointTestCase;
+
+import io.restassured.http.ContentType;
+
+/**
+ * Provides simple methods to build a test case with the desired parameters.
+ * 
+ * @author Zachary Sabourin
+ */
+public class TestCaseHelper {
+
+    /**
+     * Creates a EndpointTestCase object with the desired path, params, and schema
+     * location.
+     * Used to test successful requests/reponses. Status code 200
+     * (ok) is assumed.
+     * 
+     * @param path           the endpoint URL
+     * @param params         the request path/query parameters
+     * @param schemaLocation the schema location
+     * @return the desired endpoint test case
+     */
+    public static EndpointTestCase buildSuccessCase(String path, String[] params, String schemaLocation) {
+        return EndpointTestCase.builder()
+                .setPath(path)
+                .setParams(Optional.of(params))
+                .setResponseContentType(ContentType.JSON)
+                .setSchemaLocation(schemaLocation)
+                .build();
+    }
+
+    /**
+     * Creates a EndpointTestCase object with the desired path, params, and request
+     * format.
+     * Used to test an invalid request body format. Status code
+     * 500 (Internal Error) is assumed.
+     * 
+     * @param path          the endpoint URL
+     * @param params        the request path/query parameters
+     * @param invalidFormat the invalid request format
+     * @return the desired endpoint test case
+     */
+    public static EndpointTestCase buildInvalidFormatCase(String path, String[] params, ContentType invalidFormat) {
+        return EndpointTestCase.builder()
+                .setPath(path)
+                .setParams(Optional.of(params))
+                .setRequestContentType(invalidFormat)
+                .setStatusCode(500)
+                .build();
+    }
+
+    /**
+     * Creates a EndpointTestCase object with the desired path and params.
+     * Used to test a URL that doesn't exist. Status code 404 (Not Found) is
+     * assumed.
+     * 
+     * @param path   the endpoint URL
+     * @param params the request path/query parameters
+     * @return the desired endpoint test case
+     */
+    public static EndpointTestCase buildNotFoundCase(String path, String[] params) {
+        return EndpointTestCase.builder()
+                .setPath(path)
+                .setParams(Optional.of(params))
+                .setStatusCode(404)
+                .build();
+    }
+
+    /**
+     * Creates a EndpointTestCase object with the desired path and params.
+     * Used to test a bad request. Status code 400 (Bad Request) is assumed.
+     * 
+     * @param path   the endpoint URL
+     * @param params the request path/query parameters
+     * @return the desired endpoint test case
+     */
+    public static EndpointTestCase buildBadRequestCase(String path, String[] params) {
+        return EndpointTestCase.builder()
+                .setPath(path)
+                .setParams(Optional.of(params))
+                .setStatusCode(400)
+                .build();
+    }
+
+    private TestCaseHelper() {
+    }
+}