In a previous blog post we have seen the IgnoreIf extension. There is also a counterpart: the Requires extension. If we apply this extension to a feature method or specification class than the method or whole class is executed when the condition for the @Requires annotation is true. If the condition is false the method or specification is not executed. As a value for the @Requires annotation we must specify a closure. In the closure Spock adds some properties we can use for our conditions:

• jvm can be used to check a Java version or compatibility.
• sys returns the Java system properties.
• env used to access environment variables.
• os can be used to check for operating system names.
• javaVersion has the Java version as BigDecimal, eg. 1.8.

In the following example we use the @Requires annotation with different conditions:

package com.mrhaki.spock

import spock.lang.Requires
import spock.lang.Specification

class RequiresSampleSpec extends Specification {

    @Requires({ Boolean.valueOf(sys['spock.longRunning']) })
    def "run spec if Java system property 'spock.longRunning' is true"() {
        expect:
        true
    }

    @Requires({ Boolean.valueOf(env['SPOCK_LONG_RUNNING']) })
    def "run spec if environment variable 'SPOCK_LONG_RUNNING' is true"() {
        expect:
        true
    }

    @Requires({ javaVersion >= 1.7 })
    def "run spec if run in Java 1.7 or higher"() {
        expect:
        true
    }

    @Requires({ jvm.isJava8() })
    def "run spec if run in Java 1.8"() {
        expect:
        true
    }

    @Requires({ os.isWindows() })
    def "run only if run on windows operating system"() {
        expect:
        true
    }

}

If we have the same condition to be applied for all feature methods in a specification we can use the @Requires annotation at the class level:

package com.mrhaki.spock

import spock.lang.Requires
import spock.lang.Specification

@Requires({ jvm.isJava7Compatible() })
class RequiresSpec extends Specification {

    def "all feature methods run only if JVM is Java 7 compatible"() {
        expect:
        true
    }

}

Written with Spock 1.0-groovy-2.4.

Original article