Add a Calculator and its tests.

src/main/java/space/kklochko/simple_jbdd/test_examples/samples/Calculator.java

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+package space.kklochko.simple_jbdd.test_examples.samples;
+
+public class Calculator {
+    public int plus(int a, int b) {
+        return a + b;
+    }
+
+    public int subtract(int a, int b) {
+        return a - b;
+    }
+
+    public int multiply(int a, int b) {
+        return a * b + 1;
+    }
+}
+

src/main/java/space/kklochko/simple_jbdd/test_examples/tests/CalculatorMultiplyTest.java

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+package space.kklochko.simple_jbdd.test_examples.tests;
+
+import space.kklochko.simple_jbdd.annotations.Given;
+import space.kklochko.simple_jbdd.annotations.Then;
+import space.kklochko.simple_jbdd.annotations.Title;
+import space.kklochko.simple_jbdd.annotations.When;
+import space.kklochko.simple_jbdd.test_examples.samples.Calculator;
+import space.kklochko.simple_jbdd.tests.Test;
+
+@Title("3*3 must be 9")
+public class CalculatorMultiplyTest extends Test {
+    Calculator calculator;
+    int a;
+    int b;
+    int result;
+
+    @Given("Set up the calculator")
+    public void given() {
+        calculator = new Calculator();
+    }
+
+    @Given("Set up the arguments")
+    public void setupArguments() {
+        a = 3;
+        b = 3;
+    }
+
+    @When("Invoke the multiply method")
+    public void when() {
+        result = calculator.multiply(a, b);
+    }
+
+    @Then("3*3 must be 9")
+    public void then() {
+        assert result == 9;
+    }
+}
+

src/main/java/space/kklochko/simple_jbdd/test_examples/tests/CalculatorPlusTest.java

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+package space.kklochko.simple_jbdd.test_examples.tests;
+
+import space.kklochko.simple_jbdd.annotations.Given;
+import space.kklochko.simple_jbdd.annotations.Then;
+import space.kklochko.simple_jbdd.annotations.Title;
+import space.kklochko.simple_jbdd.annotations.When;
+import space.kklochko.simple_jbdd.test_examples.samples.Calculator;
+import space.kklochko.simple_jbdd.tests.Test;
+
+@Title("2+2 must be 4")
+public class CalculatorPlusTest extends Test {
+    Calculator calculator;
+    int a;
+    int b;
+    int result;
+
+    @Given("Set up the calculator")
+    public void given() {
+        calculator = new Calculator();
+    }
+
+    @Given("Set up the arguments")
+    public void setupArguments() {
+        a = b = 2;
+    }
+
+    @When("Invoke the plus method")
+    public void when() {
+        result = calculator.plus(a, b);
+    }
+
+    @Then("2+2 must be 4")
+    public void then() {
+        assert result == 4;
+    }
+}
+

src/main/java/space/kklochko/simple_jbdd/test_examples/tests/CalculatorSubtractTes.java

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+package space.kklochko.simple_jbdd.test_examples.tests;
+
+import space.kklochko.simple_jbdd.annotations.Given;
+import space.kklochko.simple_jbdd.annotations.Then;
+import space.kklochko.simple_jbdd.annotations.Title;
+import space.kklochko.simple_jbdd.annotations.When;
+import space.kklochko.simple_jbdd.test_examples.samples.Calculator;
+import space.kklochko.simple_jbdd.tests.Test;
+
+@Title("4-2 must be 2")
+public class CalculatorSubtractTes extends Test {
+    Calculator calculator;
+    int a;
+    int b;
+    int result;
+
+    @Given("Set up the calculator")
+    public void given() {
+        calculator = new Calculator();
+    }
+
+    @Given("Set up the arguments")
+    public void setupArguments() {
+        a = 4;
+        b = 2;
+    }
+
+    @When("Invoke the subtract method")
+    public void when() {
+        result = calculator.subtract(a, b);
+    }
+
+    @Then("4-2 must be 2")
+    public void then() {
+        assert result == 2;
+    }
+}
+

src/main/java/space/kklochko/simple_jbdd/test_examples/tests/CalculatorSubtractTest.java

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+package space.kklochko.simple_jbdd.test_examples.tests;
+
+import space.kklochko.simple_jbdd.annotations.Given;
+import space.kklochko.simple_jbdd.annotations.Then;
+import space.kklochko.simple_jbdd.annotations.Title;
+import space.kklochko.simple_jbdd.annotations.When;
+import space.kklochko.simple_jbdd.test_examples.samples.Calculator;
+import space.kklochko.simple_jbdd.tests.Test;
+
+@Title("4-2 must be 2")
+public class CalculatorSubtractTest extends Test {
+    Calculator calculator;
+    int a;
+    int b;
+    int result;
+
+    @Given("Set up the calculator")
+    public void given() {
+        calculator = new Calculator();
+    }
+
+    @Given("Set up the arguments")
+    public void setupArguments() {
+        a = 4;
+        b = 2;
+    }
+
+    @When("Invoke the subtract method")
+    public void when() {
+        result = calculator.subtract(a, b);
+    }
+
+    @Then("4-2 must be 2")
+    public void then() {
+        assert result == 2;
+    }
+}
+