Initial commit for unit-master from Calculator template

.idea/vcs.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$" vcs="Git" />
+    <mapping directory="$PROJECT_DIR$/temp_calculator" vcs="Git" />
+  </component>
+</project>

pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>org.example</groupId>
+    <artifactId>unit-test</artifactId>
+    <version>1.0-SNAPSHOT</version>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <configuration>
+                    <source>8</source>
+                    <target>8</target>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+
+    <dependencies>
+        <!-- todo: добавить необходимые зависимости -->
+    </dependencies>
+</project>

src/main/java/Main.java

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+import model.Calculator;
+
+import java.util.Scanner;
+
+public class Main {
+    public static void main(String[] args) {
+        String[] params = readParams();
+        System.out.println(Calculator.execute(params));
+    }
+
+    private static String[] readParams() {
+        // todo: считать из консоли данные, затем вернуть их в виде массива строк
+        return null;
+    }
+}

src/main/java/model/Calculator.java

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+package model;
+
+public class Calculator {
+
+    public static String execute(String[] params) {
+        String operator = params[0];
+        double value1;
+        double value2;
+        // todo: доработать код, чтобы все негативные тесты проходили успешно
+        value1 = Double.parseDouble(params[1]);
+        value2 = Double.parseDouble(params[2]);
+        double result = calculate(operator, value1, value2);
+        if (result > Integer.MAX_VALUE || result < Integer.MIN_VALUE) {
+            throw new CalculatorException("Превышен порог значений");
+        }
+        return String.valueOf(result);
+    }
+
+    private static double calculate(String operator, double a, double b) {
+        switch (operator) {
+            case "+":
+                return add(a, b);
+            case "-":
+                return subst(a, b);
+            case "*":
+                return mult(a, b);
+            case "/":
+                return div(a, b);
+        }
+        throw new CalculatorException("Неизвестный оператор");
+    }
+
+    private static double add(double a, double b) {
+        return a + b;
+    }
+
+    private static double subst(double a, double b) {
+        return a - b;
+    }
+
+    private static double div(double a, double b) {
+        if (b == 0) {
+            throw new CalculatorException();
+        }
+        return a / b;
+    }
+
+    private static double mult(double a, double b) {
+        return a * b;
+    }
+}

src/main/java/model/CalculatorException.java

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+package model;
+
+public class CalculatorException extends RuntimeException {
+
+    private static final long serialVersionUID = -1135355618665392597L;
+    private static final String MESSAGE = "Ошибка вычисления!";
+
+    public CalculatorException() {
+        super(MESSAGE);
+    }
+
+    public CalculatorException(String str) {
+        super(MESSAGE + " " + str);
+    }
+
+    public CalculatorException(Throwable e) {
+        super(MESSAGE, e);
+    }
+
+    public CalculatorException(String str, Throwable e) {
+        super(MESSAGE + " " + str, e);
+    }
+}

src/test/java/NegativeCalculatorTest.java

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+public class NegativeCalculatorTest {
+    // todo: @DataProvider for negativeData
+    // todo: negative test
+}

src/test/java/PositiveCalculatorTest.java

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+public class PositiveCalculatorTest {
+    // todo: @DataProvider for positiveData
+    // todo: positive test
+}