added solution

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

@@ -0,0 +1,23 @@
+package core.basesyntax;
+
+class Calculator {
+    public double calculate(double firstOperand, double secondOperand, char operation) {
+        switch (operation) {
+            case '+':
+                return firstOperand + secondOperand;
+            case '-':
+                return firstOperand - secondOperand;
+            case '/':
+                if (secondOperand == 0) {
+                    throw new ArithmeticException("Division by zero is not possible!");
+                }
+                return firstOperand / secondOperand;
+            case '*':
+                return firstOperand * secondOperand;
+            case '^':
+                return Math.pow(firstOperand, secondOperand);
+            default:
+                throw new IllegalArgumentException("Given invalid operation");
+        }
+    }
+}

src/test/java/core/basesyntax/CalculatorTest.java

@@ -0,0 +1,251 @@
+package core.basesyntax;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+
+class CalculatorTest {
+    private static final double DELTA = 0.0001;
+    private static Calculator calculator;
+    private double expected;
+    private double actual;
+
+    @BeforeAll
+    static void setUp() {
+        calculator = new Calculator();
+    }
+
+    @Test
+    void calculate_additionTwoPositiveOperands_Ok() {
+        expected = 30.0;
+        actual = calculator.calculate(20.0, 10.0, '+');
+        assertEquals(expected, actual);
+    }
+
+    @Test
+    void calculate_additionTwoNegativeOperands_Ok() {
+        expected = -30.0;
+        actual = calculator.calculate(-20.0, -10.0, '+');
+        assertEquals(expected, actual);
+    }
+
+    @Test
+    void calculate_additionPositiveAndNegativeOperands_Ok() {
+        expected = 20.0;
+        actual = calculator.calculate(30.0, -10.0, '+');
+        assertEquals(expected, actual);
+    }
+
+    @Test
+    void calculate_additionFirstZeroOperand_Ok() {
+        expected = 10.0;
+        actual = calculator.calculate(0, 10.0, '+');
+        assertEquals(expected, actual);
+    }
+
+    @Test
+    void calculate_additionSecondZeroOperand_Ok() {
+        expected = 40.0;
+        actual = calculator.calculate(40.0, 0, '+');
+        assertEquals(expected, actual);
+    }
+
+    @Test
+    void calculate_additionMaxDoubleOperands_Ok() {
+        expected = Double.MAX_VALUE + Double.MIN_VALUE;
+        actual = calculator.calculate(Double.MAX_VALUE, Double.MIN_VALUE, '+');
+        assertEquals(expected, actual, DELTA);
+    }
+
+    @Test
+    void calculate_subtractionTwoPositiveOperands_Ok() {
+        expected = 30.0;
+        actual = calculator.calculate(40.0, 10.0, '-');
+        assertEquals(expected, actual);
+    }
+
+    @Test
+    void calculate_subtractionTwoNegativeOperands_Ok() {
+        expected = -30.0;
+        actual = calculator.calculate(-40.0, -10.0, '-');
+        assertEquals(expected, actual);
+    }
+
+    @Test
+    void calculate_subtractionPositiveAndNegativeOperands_Ok() {
+        expected = 50.0;
+        actual = calculator.calculate(40.0, -10.0, '-');
+        assertEquals(expected, actual);
+    }
+
+    @Test
+    void calculate_subtractionFirstZeroOperand_Ok() {
+        expected = -10.0;
+        actual = calculator.calculate(0, 10.0, '-');
+        assertEquals(expected, actual);
+    }
+
+    @Test
+    void calculate_subtractionSecondZeroOperand_Ok() {
+        expected = 40.0;
+        actual = calculator.calculate(40.0, 0, '-');
+        assertEquals(expected, actual);
+    }
+
+    @Test
+    void calculate_subtractionMaxDoubleOperands_Ok() {
+        expected = Double.MAX_VALUE - Double.MIN_VALUE;
+        actual = calculator.calculate(Double.MAX_VALUE, Double.MIN_VALUE, '-');
+        assertEquals(expected, actual, DELTA);
+    }
+
+    @Test
+    void calculate_multiplicationTwoPositiveOperands_Ok() {
+        expected = 400.0;
+        actual = calculator.calculate(40.0, 10.0, '*');
+        assertEquals(expected, actual);
+    }
+
+    @Test
+    void calculate_multiplicationTwoNegativeOperands_Ok() {
+        expected = 400.0;
+        actual = calculator.calculate(-40.0, -10.0, '*');
+        assertEquals(expected, actual);
+    }
+
+    @Test
+    void calculate_multiplicationPositiveAndNegativeOperands_Ok() {
+        expected = -400.0;
+        actual = calculator.calculate(40.0, -10.0, '*');
+        assertEquals(expected, actual);
+    }
+
+    @Test
+    void calculate_multiplicationFirstZeroOperand_Ok() {
+        expected = 0;
+        actual = calculator.calculate(0, 10.0, '*');
+        assertEquals(expected, actual);
+    }
+
+    @Test
+    void calculate_multiplicationSecondZeroOperand_Ok() {
+        expected = 0;
+        actual = calculator.calculate(40.0, 0, '*');
+        assertEquals(expected, actual);
+    }
+
+    @Test
+    void calculate_multiplicationMaxDoubleOperands_Ok() {
+        expected = Double.MAX_VALUE * Double.MIN_VALUE;
+        actual = calculator.calculate(Double.MAX_VALUE, Double.MIN_VALUE, '*');
+        assertEquals(expected, actual, DELTA);
+    }
+
+    @Test
+    void calculate_divisionTwoPositiveOperands_Ok() {
+        expected = 4.0;
+        actual = calculator.calculate(40.0, 10.0, '/');
+        assertEquals(expected, actual);
+    }
+
+    @Test
+    void calculate_divisionTwoNegativeOperands_Ok() {
+        expected = 4.0;
+        actual = calculator.calculate(-40.0, -10.0, '/');
+        assertEquals(expected, actual);
+    }
+
+    @Test
+    void calculate_divisionPositiveAndNegativeOperands_Ok() {
+        expected = -4.0;
+        actual = calculator.calculate(40.0, -10.0, '/');
+        assertEquals(expected, actual);
+    }
+
+    @Test
+    void calculate_divisionFirstZeroOperand_Ok() {
+        expected = 0;
+        actual = calculator.calculate(0, 10.0, '/');
+        assertEquals(expected, actual);
+    }
+
+    @Test
+    void calculate_divisionSecondZeroOperand_Ok() {
+        assertThrows(ArithmeticException.class, () -> {
+            calculator.calculate(10, 0, '/');
+        });
+    }
+
+    @Test
+    void calculate_divisionMaxDoubleOperands_Ok() {
+        expected = Double.MAX_VALUE / Double.MIN_VALUE;
+        actual = calculator.calculate(Double.MAX_VALUE, Double.MIN_VALUE, '/');
+        assertEquals(expected, actual, DELTA);
+    }
+
+    @Test
+    void calculate_raisingPositiveValueToPositivePower_Ok() {
+        expected = 27.0;
+        actual = calculator.calculate(3.0, 3.0, '^');
+        assertEquals(expected, actual);
+    }
+
+    @Test
+    void calculate_raisingNegativeValueToPositivePower_Ok() {
+        expected = 9.0;
+        actual = calculator.calculate(-3.0, 2, '^');
+        assertEquals(expected, actual);
+    }
+
+    @Test
+    void calculate_raisingPositiveValueToNegativePower_Ok() {
+        expected = 0.1;
+        actual = calculator.calculate(10.0, -1.0, '^');
+        assertEquals(expected, actual);
+    }
+
+    @Test
+    void calculate_raisingNegativeValueToNegativePower_Ok() {
+        expected = -1;
+        actual = calculator.calculate(-1, -1, '^');
+        assertEquals(expected, actual);
+    }
+
+    @Test
+    void calculate_raisingZeroValueToPower_Ok() {
+        expected = 0;
+        actual = calculator.calculate(0.0, 1, '^');
+        assertEquals(expected, actual);
+    }
+
+    @Test
+    void calculate_raisingPositiveValueToZeroPower_Ok() {
+        expected = 1;
+        actual = calculator.calculate(10.0, 0.0, '^');
+        assertEquals(expected, actual);
+    }
+
+    @Test
+    void calculate_raisingNegativeValueToZeroPower_Ok() {
+        expected = 1;
+        actual = calculator.calculate(-10.0, 0.0, '^');
+        assertEquals(expected, actual);
+    }
+
+    @Test
+    void calculate_raisingFirstIsZeroToNegativePower() {
+        expected = Double.POSITIVE_INFINITY;
+        actual = calculator.calculate(0, -2, '^');
+        assertEquals(expected, actual);
+    }
+
+    @Test
+    void calculate_illegalOperation_Ok() {
+        char illegalOperation = 'a';
+        assertThrows(IllegalArgumentException.class, () -> {
+            calculator.calculate(100.0, 100.0, illegalOperation);
+        });
+    }
+}