test(aio): add mock services

aio/src/testing/logger.service.ts

@@ -0,0 +1,23 @@
+import { Injectable } from '@angular/core';
+
+@Injectable()
+export class MockLogger {
+
+  output = {
+    log: [],
+    error: [],
+    warn: []
+  };
+
+  log(value: any, ...rest) {
+    this.output.log.push([value, ...rest]);
+  }
+
+  error(value: any, ...rest) {
+    this.output.error.push([value, ...rest]);
+  }
+
+  warn(value: any, ...rest) {
+    this.output.warn.push([value, ...rest]);
+  }
+}