s0574094 Marco Hamiti /PullRequest/Unvollständig

src/main/java/tdd/setup/Calculator.java

@@ -3,7 +3,7 @@
 // behaviour inspired by https://www.online-calculator.com/
 public class Calculator {
 
-    private String screen = "0";
+    private String screen = "";
 
     private double latestValue;
 
@@ -17,9 +17,11 @@ public void pressDigitKey(int digit) {
 
         if(latestOperation.isEmpty()) {
             screen = screen + digit;
+
         } else {
             latestValue = Double.parseDouble(screen);
             screen = Integer.toString(digit);
+
         }
     }
 

src/test/java/tdd/setup/CalculatorTest.java

@@ -17,3 +17,38 @@ void calculatorCanDoTwoPlusTwo() {
         assertEquals("4", calc.readScreen());
     }
 }
+class CalculatorTest2 {
+    @Test
+    @DisplayName("should display result after suctracting two positive numbers")
+    void calculatorCanDoThreeMinusTwo() {
+        Calculator calc = new Calculator();
+        calc.pressDigitKey(3);
+        calc.pressOperationKey("-");
+        calc.pressDigitKey(2);
+        calc.pressEquals();
+        assertEquals("1", calc.readScreen());
+    }
+}
+class CalculatorTest3 {
+    @Test
+    @DisplayName("should display result after pressDigitKey")
+    void calculatorCanMulti() {
+        Calculator calc = new Calculator();
+        calc.pressDigitKey(2);
+        assertEquals("2", calc.readScreen());
+    }
+}
+class CalculatorTest4 {
+    @Test
+    @DisplayName("should display result after adding two positive point numbers")
+    void calculatorCanDoTwoPlusTwo() {
+        Calculator calc = new Calculator();
+        calc.pressDigitKey(2);
+        calc.pressOperationKey("+");
+        calc.pressDigitKey(3);
+        calc.pressDotKey();
+        calc.pressDigitKey(4);
+        calc.pressEquals();
+        assertEquals("6.3", calc.readScreen());
+    }
+}