Add tests for useV3ErrFormat.

Signed-off-by: Gene Johnston <Eugene.Johnston@broadcom.com>

packages/utilities/__tests__/NextVerFeatures.test.ts

@@ -0,0 +1,50 @@
+/*
+* This program and the accompanying materials are made available under the terms of the
+* Eclipse Public License v2.0 which accompanies this distribution, and is available at
+* https://www.eclipse.org/legal/epl-v20.html
+*
+* SPDX-License-Identifier: EPL-2.0
+*
+* Copyright Contributors to the Zowe Project.
+*
+*/
+
+import { ImperativeConfig } from "../src/ImperativeConfig";
+import { NextVerFeatures } from "../src/NextVerFeatures";
+
+describe("NextVerFeatures", () => {
+    const impCfg: ImperativeConfig = ImperativeConfig.instance;
+
+    beforeAll(() => {
+        // impCfg.getCliCmdName is a getter of a property, so mock the property
+        Object.defineProperty(impCfg, "envVariablePrefix", {
+            configurable: true,
+            get: jest.fn(() => {
+                return "ZOWE";
+            })
+        });
+    });
+
+    describe("useV3ErrFormat", () => {
+
+        it("should return false when environment variable is not set", () => {
+            delete process.env.ZOWE_V3_ERR_FORMAT;
+            expect(NextVerFeatures.useV3ErrFormat()).toBe(false);
+        });
+
+        it("should return true when environment variable is set to lowercase true", () => {
+            process.env.ZOWE_V3_ERR_FORMAT = "true";
+            expect(NextVerFeatures.useV3ErrFormat()).toBe(true);
+        });
+
+        it("should return true when environment variable is set to uppercase TRUE", () => {
+            process.env.ZOWE_V3_ERR_FORMAT = "TRUE";
+            expect(NextVerFeatures.useV3ErrFormat()).toBe(true);
+        });
+
+        it("should return false when environment variable is set to a non-true value", () => {
+            process.env.ZOWE_V3_ERR_FORMAT = "someGoofyValue";
+            expect(NextVerFeatures.useV3ErrFormat()).toBe(false);
+        });
+    });
+});