unit test & packages

Code/Steiner/packagesStuff/src/App.java

@@ -1,5 +1,8 @@
 public class App {
     public static void main(String[] args) throws Exception {
-        System.out.println("Hello, World!");
+        // System.out.println(Txt.Left("Hello World", 5));
+        // System.out.println(Txt.Left("Hello World", -2));
+        // System.out.println(Txt.Left("Hello World", 122));
+        // System.out.println(Txt.Left("Hello World", 0));
     }
 }

Code/Steiner/packagesStuff/src/tech/photofuel/util/Txt.java

@@ -0,0 +1,16 @@
+package tech.photofuel.util;
+
+public class Txt {
+    public static String Left(String text, int anzahlZeichen) {
+        try {
+            if (text.length() < anzahlZeichen) {
+                return text;
+            } else {
+                return text.substring(0, anzahlZeichen);
+            }
+        } catch (Exception e) {
+            System.out.println("Invalid input error: " + e);
+            return null;
+        }
+    }
+}

Code/Steiner/unitTest/.vscode/settings.json

@@ -0,0 +1,7 @@
+{
+    "java.project.sourcePaths": ["src"],
+    "java.project.outputPath": "bin",
+    "java.project.referencedLibraries": [
+        "lib/**/*.jar"
+    ]
+}

Code/Steiner/unitTest/README.md

@@ -0,0 +1,18 @@
+## Getting Started
+
+Welcome to the VS Code Java world. Here is a guideline to help you get started to write Java code in Visual Studio Code.
+
+## Folder Structure
+
+The workspace contains two folders by default, where:
+
+- `src`: the folder to maintain sources
+- `lib`: the folder to maintain dependencies
+
+Meanwhile, the compiled output files will be generated in the `bin` folder by default.
+
+> If you want to customize the folder structure, open `.vscode/settings.json` and update the related settings there.
+
+## Dependency Management
+
+The `JAVA PROJECTS` view allows you to manage your dependencies. More details can be found [here](https://github.com/microsoft/vscode-java-dependency#manage-dependencies).

Code/Steiner/unitTest/src/App.java

@@ -0,0 +1,10 @@
+public class App {
+    public static void main(String[] args) {
+        App rechteckRechner = new App();
+        System.out.println(rechteckRechner.calcUmfang(4.3, 5.7));
+    }
+
+    public double calcUmfang(double seiteA, double seiteB) {
+        return 2 * seiteA + 2 * seiteB;
+    }
+}

Code/Steiner/unitTest/src/AppTest.java

@@ -0,0 +1,15 @@
+import static org.junit.Assert.assertEquals;
+
+import org.junit.Test;
+
+public class AppTest {
+    @Test
+    public void testCalcUmfang() {
+        App calculation = new App();
+
+        assertEquals(-21, calculation.calcUmfang(-5, -5), 0.1);
+        assertEquals("0", calculation.calcUmfang(0, 0), 0.1);
+        assertEquals(2001000, calculation.calcUmfang(100000, 0), 0.1);
+        assertEquals(10, calculation.calcUmfang(-2, 7), 0.1);
+    }
+}