diff --git a/package-lock.json b/package-lock.json
index 8b15ab6..aadfd45 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -6,7 +6,7 @@
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+      "resolved": "https://verdaccio.lossless.one/@airbnb%2fnode-memwatch/-/node-memwatch-1.0.2.tgz",
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@@ -16,7 +16,7 @@
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+      "resolved": "https://verdaccio.lossless.one/@babel%2fhighlight/-/highlight-7.5.0.tgz",
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@@ -61,9 +61,9 @@
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-      "resolved": "https://registry.npmjs.org/@pushrocks/consolecolor/-/consolecolor-2.0.1.tgz",
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@@ -87,7 +87,7 @@
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     "yn": {
       "version": "3.1.0",
-      "resolved": "https://registry.npmjs.org/yn/-/yn-3.1.0.tgz",
+      "resolved": "https://verdaccio.lossless.one/yn/-/yn-3.1.0.tgz",
       "integrity": "sha512-kKfnnYkbTfrAdd0xICNFw7Atm8nKpLcLv9AZGEt+kczL/WQVai4e2V6ZN8U/O+iI6WrNuJjNNOyu4zfhl9D3Hg==",
       "dev": true
     }
diff --git a/package.json b/package.json
index d489ea9..4f4244a 100644
--- a/package.json
+++ b/package.json
@@ -14,10 +14,10 @@
   },
   "devDependencies": {
     "@gitzone/tsbuild": "^2.0.22",
-    "@gitzone/tstest": "^1.0.15",
-    "@pushrocks/tapbundle": "^3.0.7",
-    "@types/node": "^10.11.7",
-    "tslint": "^5.11.0",
+    "@gitzone/tstest": "^1.0.24",
+    "@pushrocks/tapbundle": "^3.0.11",
+    "@types/node": "^12.0.12",
+    "tslint": "^5.18.0",
     "tslint-config-prettier": "^1.15.0"
   },
   "dependencies": {}
diff --git a/test/test.ts b/test/test.ts
index e7a6e9c..3eea9ff 100644
--- a/test/test.ts
+++ b/test/test.ts
@@ -1,9 +1,18 @@
 import { expect, tap } from '@pushrocks/tapbundle';
 import * as finplusInterfaces from '../ts/index';
 
+interface ITestTransaction {
+  date: Date;
+  amount: number;
+}
+
 tap.test('first test', async () => {
-  let dummyCsvParser : finplusInterfaces.ICsvParser;
-  dummyCsvParser;
+  class MyCsvParser extends finplusInterfaces.AcCsvParser<ITestTransaction> {
+    public transactionArray: ITestTransaction[] = [];
+    public async getTransactions(): Promise<ITestTransaction[]> {
+      return this.transactionArray;
+    }
+  }
 });
 
 tap.start();
diff --git a/ts/interfaces/csvparser.ts b/ts/interfaces/csvparser.ts
index f8fef87..2830bda 100644
--- a/ts/interfaces/csvparser.ts
+++ b/ts/interfaces/csvparser.ts
@@ -1,4 +1,4 @@
 export abstract class AcCsvParser<T> {
   public abstract transactionArray: T[];
-  public abstract async getTransactions (): Promise<T>;
+  public abstract async getTransactions (): Promise<T[]>;
 }
\ No newline at end of file