[app-configuration] Make user agent string match package.json version.

sdk/appconfiguration/app-configuration/src/generated/src/appConfigurationContext.ts

@@ -12,7 +12,7 @@ import * as coreHttp from "@azure/core-http";
 import * as Models from "./models";
 
 const packageName = "app-configuration";
-const packageVersion = "1.0.0";
+export const packageVersion = "1.0.0-preview.4";
 
 export class AppConfigurationContext extends coreHttp.ServiceClient {
   syncToken?: string;

sdk/appconfiguration/app-configuration/test/package.spec.ts

@@ -0,0 +1,16 @@
+import { join } from "path";
+import { readFileSync } from "fs";
+import * as assert from "assert";
+// this constant isn't normally exported by the generator so you'll need to do it
+// by hand if you regenerate the models.
+import { packageVersion } from "../src/generated/src/appConfigurationContext";
+
+describe("packagejson related tests", () => {
+  it("user agent string", () => {
+    const packageJsonFilePath = join(__dirname, "../package.json");
+    const rawFileContents = readFileSync(packageJsonFilePath, { encoding: "utf-8" });
+    const packageJsonContents = JSON.parse(rawFileContents);
+
+    assert.equal(packageJsonContents.version, packageVersion);
+  });
+});