jv-lambda-calc task completed

src/main/java/core/basesyntax/Calculate.java

@@ -0,0 +1,5 @@
+package core.basesyntax;
+
+public interface Calculate {
+    double calculate(double a, double b, char c);
+}

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

@@ -0,0 +1,25 @@
+package core.basesyntax;
+
+public class Calculator implements Calculate {
+
+    @Override
+    public double calculate(double firstParameter, double secondParameter, char operation) {
+        switch (operation) {
+            case '+':
+                return firstParameter + secondParameter;
+            case '-':
+                return firstParameter - secondParameter;
+            case '*':
+                return firstParameter * secondParameter;
+            case '^':
+                return Math.pow(firstParameter, secondParameter);
+            case '/':
+                if (secondParameter == 0) {
+                    throw new IllegalArgumentException("Division by zero");
+                }
+                return firstParameter / secondParameter;
+            default:
+                throw new IllegalArgumentException("Invalid operation");
+        }
+    }
+}

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

@@ -0,0 +1,137 @@
+package core.basesyntax;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+
+import org.junit.jupiter.api.Test;
+
+class CalculatorTest {
+    private static final double DELTA = 0.0001;
+    private Calculate calculator = new Calculator();
+
+    @Test
+    void additionWithTwoPositiveOperands_Ok() {
+        double expected = 100.0;
+        double actual = calculator.calculate(90.0, 10.0, '+');
+        assertEquals(expected, actual);
+    }
+
+    @Test
+    void additionWithTwoNegativeOperands_Ok() {
+        double expected = - 150.0;
+        double actual = calculator.calculate(-100.0, -50.0, '+');
+        assertEquals(expected, actual);
+    }
+
+    @Test
+    void additionWithPositiveAndNegativeOperands_Ok() {
+        double expected = - 150.0;
+        double actual = calculator.calculate(-200.0, 50.0, '+');
+        assertEquals(expected, actual);
+    }
+
+    @Test
+    void additionWithFirstOperandIsZero_Ok() {
+        double expected = 50.0;
+        double actual = calculator.calculate(0.0, 50.0, '+');
+        assertEquals(expected, actual);
+    }
+
+    @Test
+    void additionWithSecondOperandIsZero_Ok() {
+        double expected = 60.0;
+        double actual = calculator.calculate(60.0, 0.0, '+');
+        assertEquals(expected, actual);
+    }
+
+    @Test
+    void additionWithMinAndMaxDoubleValues_Ok() {
+        double expected = Double.MAX_VALUE + Double.MIN_VALUE;
+        double actual = calculator.calculate(Double.MAX_VALUE, Double.MIN_VALUE, '+');
+        assertEquals(expected, actual, DELTA);
+    }
+
+    @Test
+    void subtractionWithMinAndMaxDoubleValues_Ok() {
+        double expected = Double.MAX_VALUE - Double.MIN_VALUE;
+        double actual = calculator.calculate(Double.MAX_VALUE, Double.MIN_VALUE, '-');
+        assertEquals(expected, actual, DELTA);
+    }
+
+    @Test
+    void multiplicationWithMinAndMaxDoubleValues_Ok() {
+        double expected = Double.MAX_VALUE * Double.MIN_VALUE;
+        double actual = calculator.calculate(Double.MAX_VALUE, Double.MIN_VALUE, '*');
+        assertEquals(expected, actual, DELTA);
+    }
+
+    @Test
+    void divisionWithMinAndMaxDoubleValues_Ok() {
+        double expected = Double.MAX_VALUE / Double.MIN_VALUE;
+        double actual = calculator.calculate(Double.MAX_VALUE, Double.MIN_VALUE, '/');
+        assertEquals(expected, actual, DELTA);
+    }
+
+    @Test
+    void divisionByZero_NotOk() {
+        assertThrows(IllegalArgumentException.class, () -> {
+            calculator.calculate(2.0, 0.0, '/');
+        });
+    }
+
+    @Test
+    void raisingPositiveValueToThePositivePower_Ok() {
+        double expected = 64.0;
+        double actual = calculator.calculate(8.0, 2.0, '^');
+        assertEquals(expected, actual);
+    }
+
+    @Test
+    void raisingNegativeValueToThePositivePower_Ok() {
+        double expected = 64.0;
+        double actual = calculator.calculate(-8.0, 2.0, '^');
+        assertEquals(expected, actual);
+    }
+
+    @Test
+    void raisingPositiveValueToTheNegativePower_Ok() {
+        double expected = 0.015625;
+        double actual = calculator.calculate(8.0, -2.0, '^');
+        assertEquals(expected, actual, DELTA);
+    }
+
+    @Test
+    void raisingNegativeValueToTheNegativePower_Ok() {
+        double expected = 0.015625;
+        double actual = calculator.calculate(-8.0, -2.0, '^');
+        assertEquals(expected, actual, DELTA);
+    }
+
+    @Test
+    void raisingPositiveValueToZeroPower_Ok() {
+        double expected = 1.0;
+        double actual = calculator.calculate(8.0, 0.0, '^');
+        assertEquals(expected, actual);
+    }
+
+    @Test
+    void raisingNegativeValueToZeroPower_Ok() {
+        double expected = 1.0;
+        double actual = calculator.calculate(-8.0, 0.0, '^');
+        assertEquals(expected, actual);
+    }
+
+    @Test
+    void raisingZeroToPower_Ok() {
+        double expected = 0.0;
+        double actual = calculator.calculate(0.0, 10.0, '^');
+        assertEquals(expected, actual);
+    }
+
+    @Test
+    void illegalOperation_NotOk() {
+        assertThrows(IllegalArgumentException.class, () -> {
+            calculator.calculate(2.0, 3.0, '#');
+        });
+    }
+}