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Create a Maven metadata file where you enable Groovy usage and pull all the dependencies. In the root folder of your project, create the pom.xml file like this one (substitute "myproject" with you project name).
paste-code-macro
language	xml
linenumbers	true
collapse	true
<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>net.pricefx.myproject</groupId>
    <artifactId>myproject-logic</artifactId>
    <version>1.0-SNAPSHOT</version>
    <name>Price f(x) MyProject Logic</name>

    <properties>
        <!-- testing -->
        <junit.version>4.12</junit.version>
        <spock.version>1.1-groovy-2.4</spock.version>

        <!-- maven -->
        <maven-compiler-plugin.version>3.6.1</maven-compiler-plugin.version>
        <maven-surefire-plugin.version>2.20</maven-surefire-plugin.version>

        <source.jdk>1.8</source.jdk>
        <target.jdk>1.8</target.jdk>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>

    <build>
        <plugins>
            <plugin>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>${maven-compiler-plugin.version}</version>
                <configuration>
                    <source>${target.jdk}</source>
                    <target>${target.jdk}</target>
                    <forceJavacCompilerUse>true</forceJavacCompilerUse>
                </configuration>
                <executions>
                    <execution>
                        <phase>compile</phase>
                        <goals>
                            <goal>compile</goal>
                            <goal>testCompile</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
            <plugin>
                <groupId>org.codehaus.gmavenplus</groupId>
                <artifactId>gmavenplus-plugin</artifactId>
                <version>1.5</version>
                <executions>
                    <execution>
                        <goals>
                            <goal>addTestSources</goal>
                            <goal>testCompile</goal>
                        </goals>
                    </execution>
                </executions>
                <configuration>
                    <testSources>
                        <testSource>
                            <directory>${basedir}/tdd4c</directory>
                            <includes>
                                <include>**/*.groovy</include>
                            </includes>
                        </testSource>
                    </testSources>
                </configuration>
            </plugin>
        </plugins>
    </build>

    <dependencies>

        <!-- Test -->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>${junit.version}</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.spockframework</groupId>
            <artifactId>spock-core</artifactId>
            <version>${spock.version}</version>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.codehaus.groovy</groupId>
                    <artifactId>groovy-all</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>net.pricefx</groupId>
            <artifactId>tdd4c</artifactId>
            <version>1.0-SNAPSHOT</version>
            <scope>test</scope>
        </dependency>

    </dependencies>

    <repositories>
        <repository>
            <id>Default repo</id>
            <url>http://repo1.maven.org/maven2</url>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
            <releases>
                <enabled>true</enabled>
            </releases>
        </repository>

        <repository>
            <id>Pricefx maven artifacts</id>
            <url>http://maven.pricefx.net/</url>
            <snapshots>
                <enabled>true</enabled>
            </snapshots>
            <releases>
                <enabled>true</enabled>
            </releases>
        </repository>
    </repositories>
</project>
Create the tdd4c folder in the project's root directory.
Mark it as the test sources root in you favourite IDE.
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