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CalculatorTest.java

+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class CalculatorTest {
+
+    @Test
+    void reset() {
+        Calculator calculator = new Calculator();
+        assertEquals(0, calculator.reset());
+    }
+
+    @Test
+    void getResult() {
+        Calculator calculator = new Calculator();
+        assertEquals(0, calculator.getResult());
+    }
+
+    @Test
+    void add() {
+        Calculator calculator = new Calculator();
+        calculator.add(10);
+        calculator.add(-5);
+        assertEquals(5, calculator.getResult());
+    }
+
+    @Test
+    void subtract() {
+        Calculator calculator = new Calculator();
+        calculator.add(10);
+        calculator.subtract(5);
+        assertEquals(5, calculator.getResult());
+    }
+
+    @Test
+    void multiply() {
+        Calculator calculator = new Calculator();
+        calculator.add(5);
+        calculator.multiply(2);
+        calculator.multiply(-3);
+        assertEquals(-30, calculator.getResult());
+    }
+
+    @Test
+    void exponent() {
+        Calculator calculator = new Calculator();
+        calculator.add(4);
+        calculator.exponent(2);
+        calculator.exponent(2);
+        assertEquals(256, calculator.getResult());
+    }
+
+}
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