full test coverage

pom.xml

@@ -22,15 +22,10 @@
         <dependency>
             <groupId>org.junit.jupiter</groupId>
             <artifactId>junit-jupiter-api</artifactId>
-            <version>${junit-jupiter.version}</version>
-            <scope>test</scope>
-        </dependency>
-        <dependency>
-            <groupId>org.junit.jupiter</groupId>
-            <artifactId>junit-jupiter-engine</artifactId>
-            <version>${junit-jupiter.version}</version>
+            <version>5.8.0-RC1</version>
             <scope>test</scope>
         </dependency>
+
     </dependencies>
     <build>
         <plugins>

src/main/java/core/basesyntax/Calculator.java

@@ -0,0 +1,26 @@
+package core.basesyntax;
+
+public class Calculator {
+    public double calculate(double firstValue, double secondValue, char operation) {
+        switch (operation) {
+            case '+':
+                return firstValue + secondValue;
+            case '-':
+                return firstValue - secondValue;
+            case '*':
+                return firstValue * secondValue;
+            case '/':
+                if (secondValue == 0) {
+                    throw new ArithmeticException("can`t divide on 0");
+                }
+                return firstValue / secondValue;
+            case '^':
+                if (secondValue == Double.MIN_VALUE) {
+                    throw new IllegalValueException("can`t resolve operation");
+                }
+                return Math.pow(firstValue, secondValue);
+            default:
+                throw new IllegalOperatorException("can't recognise operator, try again");
+        }
+    }
+}

src/main/java/core/basesyntax/IllegalOperatorException.java

@@ -0,0 +1,7 @@
+package core.basesyntax;
+
+public class IllegalOperatorException extends RuntimeException {
+    public IllegalOperatorException(String message) {
+        super(message);
+    }
+}

src/main/java/core/basesyntax/IllegalValueException.java

@@ -0,0 +1,7 @@
+package core.basesyntax;
+
+public class IllegalValueException extends RuntimeException {
+    public IllegalValueException(String message) {
+        super(message);
+    }
+}