Add error when ikey/connection string not present in TelemetryClient (#1008)

Library/Config.ts

@@ -78,11 +78,6 @@ class Config implements IConfig {
 
         const instrumentationKeyEnv: string | undefined = this._instrumentationKey;
         this.instrumentationKey = csCode.instrumentationkey || iKeyCode /* === instrumentationKey */ || csEnv.instrumentationkey || instrumentationKeyEnv;
-
-        if (!this.instrumentationKey || this.instrumentationKey == "") {
-            throw new Error("Instrumentation key not found, please provide a connection string before starting the server");
-        }
-
         let endpoint = `${this.endpointUrl || csCode.ingestionendpoint || csEnv.ingestionendpoint || this._endpointBase}`;
         if (endpoint.endsWith("/")) {
             // Remove extra '/' if present

Library/TelemetryClient.ts

@@ -42,6 +42,9 @@ class TelemetryClient {
     constructor(setupString?: string) {
         var config = new Config(setupString);
         this.config = config;
+        if (!this.config.instrumentationKey || this.config.instrumentationKey == "") {
+            throw new Error("Instrumentation key not found, please provide a connection string before starting Application Insights SDK.");
+        }
         this.context = new Context();
         this.commonProperties = {};
         this.authorizationHandler = null;

Tests/Bootstrap/Default.spec.ts

@@ -99,6 +99,12 @@ describe("#setupAndStart()", () => {
 
         sinon.stub(Helpers, "sdkAlreadyExists", () => false);
         // Test
-        assert.throws(function () { const Default = require("../../Bootstrap/Default") as typeof DefaultTypes; });
+        const Default = require("../../Bootstrap/Default") as typeof DefaultTypes;
+        Default.setLogger(new DiagnosticLogger(logger));
+
+        let result = Default.setupAndStart();
+        assert.equal(result, null);
+        assert.equal(logger.logCount, 0);
+        assert.equal(logger.errorCount, 1);
     });
 });

Tests/Library/Client.tests.ts

@@ -113,6 +113,13 @@ describe("Library/TelemetryClient", () => {
             };
             assert.ok(client.getAuthorizationHandler(client.config));
         });
+
+        it("should throw if no iKey is available", () => {
+            var env = {};
+            process.env = env;
+            assert.throws(() => new Client());
+        });
+
     });
 
     describe("#trackEvent()", () => {

Tests/Library/Config.tests.ts

@@ -122,11 +122,6 @@ describe("Library/Config", () => {
                 http.request.restore();
                 https.request.restore();
             });
-            it("should throw if no iKey is available", () => {
-                var env = {};
-                process.env = env;
-                assert.throws(() => new Config());
-            });
             
             it("should read iKey from environment", () => {
                 var env = <{ [id: string]: string }>{};