Test case which shows a bug on AbstractSerializableParameter in io.swagger:swagger-models:1.5.20

AbstractSerializableParameterTest.java

package com.example.bootdemo;

import io.swagger.models.parameters.AbstractSerializableParameter;
import io.swagger.models.properties.BaseIntegerProperty;
import org.junit.jupiter.api.AfterEach;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;

import java.io.ByteArrayOutputStream;
import java.io.PrintStream;

import static org.assertj.core.api.Assertions.*;

/**
 * @see io.swagger.annotations.ApiImplicitParam @ApiImplicitParam
 */
public class LogicTest {

    private AbstractSerializableParameter<AnyParameter> parameter;
    private static class AnyParameter extends AbstractSerializableParameter<AnyParameter> {} // just a dummy

    private final ByteArrayOutputStream out = new ByteArrayOutputStream();

    @BeforeEach
    void beforeEach() {
        parameter = new AbstractSerializableParameter<>() {};
        System.setOut(new PrintStream(out));
    }

    @AfterEach
    void afterEach() {
        System.setOut(System.out);
    }

    @Test
    void givenNull_whenGettingExample_thenShowNoWarningLog() {
        // Given
        parameter.setExample(null);
        parameter.setType(BaseIntegerProperty.TYPE);

        // When
        parameter.getExample();

        // Then
        assertThat(out.toString()).isEqualTo("");
    }

    /**
     * Test that fails
     */
    @Test
    void givenEmptyString_whenGettingExample_thenShowNoWarningLog() {
        // Given
        parameter.setExample("");
        parameter.setType(BaseIntegerProperty.TYPE);

        // When
        parameter.getExample();

        // Then
        assertThat(out.toString()).isEqualTo("");
    }
}

This bug has been fixed already in the later verion 1.5.21 of swagger-models. But the latest version of springfox-boot-starter 3.0.0 still has this dependency. I raised an issue for solving this problem at:

• springfox/springfox#3552