Testing Gradle plugins

.
└── src
    ├── functionalTest
    │   └── groovy      (1)
    ├── integrationTest
    │   └── groovy      (2)
    ├── main
    │   ├── java        (3)
    └── test
        └── groovy      (4)

// Define a source set named 'test' for test sources
sourceSets {
    test {
        java {
            srcDirs = ['src/test/java']
        }
    }
}
// Specify a test implementation dependency on JUnit
dependencies {
    testImplementation 'junit:junit:4.12'
}

package org.myorg.http;

public class HttpResponse {
    private int code;
    private String message;

    public HttpResponse(int code, String message) {
        this.code = code;
        this.message = message;
    }

    public int getCode() {
        return code;
    }

    public String getMessage() {
        return message;
    }

    @Override
    public String toString() {
        return "HTTP " + code + ", Reason: " + message;
    }
}

package org.myorg.http

import spock.lang.Specification

class HttpResponseTest extends Specification {

    private static final int OK_HTTP_CODE = 200
    private static final String OK_HTTP_MESSAGE = 'OK'

    def "can access information"() {
        when:
        def httpResponse = new HttpResponse(OK_HTTP_CODE, OK_HTTP_MESSAGE)

        then:
        httpResponse.code == OK_HTTP_CODE
        httpResponse.message == OK_HTTP_MESSAGE
    }

    def "can get String representation"() {
        when:
        def httpResponse = new HttpResponse(OK_HTTP_CODE, OK_HTTP_MESSAGE)

        then:
        httpResponse.toString() == "HTTP $OK_HTTP_CODE, Reason: $OK_HTTP_MESSAGE"
    }
}

package org.myorg.http;

import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.URL;

public class DefaultHttpCaller implements HttpCaller {
    @Override
    public HttpResponse get(String url) {
        try {
            HttpURLConnection connection = (HttpURLConnection) new URL(url).openConnection();
            connection.setConnectTimeout(5000);
            connection.setRequestMethod("GET");
            connection.connect();

            int code = connection.getResponseCode();
            String message = connection.getResponseMessage();
            return new HttpResponse(code, message);
        } catch (IOException e) {
            throw new HttpCallException(String.format("Failed to call URL '%s' via HTTP GET", url), e);
        }
    }
}

package org.myorg.http

import spock.lang.Specification
import spock.lang.Subject

class DefaultHttpCallerIntegrationTest extends Specification {
    @Subject HttpCaller httpCaller = new DefaultHttpCaller()

    def "can make successful HTTP GET call"() {
        when:
        def httpResponse = httpCaller.get('https://www.google.com/')

        then:
        httpResponse.code == 200
        httpResponse.message == 'OK'
    }

    def "throws exception when calling unknown host via HTTP GET"() {
        when:
        httpCaller.get('https://www.wedonotknowyou123.com/')

        then:
        def t = thrown(HttpCallException)
        t.message == "Failed to call URL 'https://www.wedonotknowyou123.com/' via HTTP GET"
        t.cause instanceof UnknownHostException
    }
}

package org.myorg;

import org.gradle.api.Plugin;
import org.gradle.api.Project;
import org.myorg.tasks.UrlVerify;

public class UrlVerifierPlugin implements Plugin<Project> {
    @Override
    public void apply(Project project) {
        UrlVerifierExtension extension = project.getExtensions().create("verification", UrlVerifierExtension.class);
        UrlVerify verifyUrlTask = project.getTasks().create("verifyUrl", UrlVerify.class);
        verifyUrlTask.getUrl().set(extension.getUrl());
    }
}

package org.myorg

import org.gradle.testkit.runner.GradleRunner
import spock.lang.Specification
import spock.lang.TempDir

import static org.gradle.testkit.runner.TaskOutcome.SUCCESS

class UrlVerifierPluginFunctionalTest extends Specification {
    @TempDir File testProjectDir
    File buildFile

    def setup() {
        buildFile = new File(testProjectDir, 'build.gradle')
        buildFile << """
            plugins {
                id 'org.myorg.url-verifier'
            }
        """
    }

    def "can successfully configure URL through extension and verify it"() {
        buildFile << """
            verification {
                url = 'https://www.google.com/'
            }
        """

        when:
        def result = GradleRunner.create()
            .withProjectDir(testProjectDir)
            .withArguments('verifyUrl')
            .withPluginClasspath()
            .build()

        then:
        result.output.contains("Successfully resolved URL 'https://www.google.com/'")
        result.task(":verifyUrl").outcome == SUCCESS
    }
}