TestFXΒΆ

JavaFX user interfaces can be unit tested with the TestFX framework.

Material on how TestFX is used can be found:

However, we are aware that the documentation of TestFX is poor. The interface documentation can be read here. A small example on how to test the calculator with TestFX:

import org.testfx.framework.junit5.ApplicationTest;

public class CalculatorTest extends ApplicationTest {
    @Override
    public void start(Stage stage) {
        new Calculator().start(stage);
    }

    @Test
    @DisplayName("Testing button basics")
    public void checkButtons() {
        String[] queries = {"#btnAdd", "#btnSub", "#btnMul", "#btnDiv"};
        String[] texts = {"Add", "Subtract", "Multiply", "Divide"};
        for(int i = 0; i < queries.length; i++) {
        Button node = fromAll().lookup(queries[i]).query();
        assertTextsEqual(node.getText(), texts[i], queries[i].substring(1));
        }
    }

    @Test
    @DisplayName("Testing operations")
    public void checkOperations() {
        TextField op1 = fromAll().lookup("#fieldOp1").query();
        TextField op2 = fromAll().lookup("#fieldOp2").query();
        Label res = fromAll().lookup("#fieldRes").query();
        String[] queries = {"#btnAdd", "#btnSub", "#btnMul", "#btnDiv"};
        String[] operations = {"+", "-", "*", "/"};
        String[][] operands = {{"12.5", "62.5"}, {"-900", "30"}};
        String[][] results = {{"75.0", "-50.0", "781.25", "0.2"},
                            {"-870.0", "-930.0", "-27000.0", "-30.0"}};
        for(int i = 0; i < queries.length; i++) {
        Button node = fromAll().lookup(queries[i]).query();
        for(int j = 0; j < operands.length; j++) {
            op1.setText(operands[j][0]);
            op2.setText(operands[j][1]);
            clickOn(node);
            assertTextsEqual(res.getText(), results[j][i], String.format(
                    "fieldRes after computing %s %s %s", operands[j][0],
                    operations[i], operands[j][1]));
        }
        }
    }
}
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