It seems this was also an issue a few years ago and it appears to be back. I have a small pact.io demo project I am using to wire everything together. However I keep running into this error. I think there is a dependency missing but I have all the recommended dependencies.

java.lang.IllegalArgumentException: Invalid pact broker host specified ('${pactbroker.host:}'). Please provide a valid host or specify the system property 'pactbroker.host'.

pom.xml

    <!-- ================================================================= -->
    <!--                              Pact.io                              -->
    <!-- ================================================================= -->
    <dependency>
        <groupId>au.com.dius.pact.consumer</groupId>
        <artifactId>junit5</artifactId>
        <version>4.6.10</version>
    </dependency>
    <dependency>
        <groupId>au.com.dius.pact.provider</groupId>
        <artifactId>junit5</artifactId>
        <version>4.6.10</version>
    </dependency>
    <dependency>
        <groupId>au.com.dius</groupId>
        <artifactId>pact-jvm-provider-junit_2.11</artifactId>
        <version>3.5.24</version>
    </dependency>

Provider

@PactBroker
@PactFolder("pacts")
@Provider("search_provider")
@ExtendWith(SpringExtension.class)
@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.DEFINED_PORT)
public class ProviderTest {

    @TestTemplate
    @ExtendWith(PactVerificationInvocationContextProvider.class)
    void pactVerificationTestTemplate(PactVerificationContext context) throws IOException {
        context.verifyInteraction();
    }

}

consumer

@PactConsumerTest
@PactTestFor(providerName = "search_provider")
class ConsumerTest {

    @Pact(provider="search_provider", consumer="test_consumer")
    public RequestResponsePact createPact(PactDslWithProvider builder) {
        return builder
                .given("test state")
                .uponReceiving("Example of test interactions")
                .path("/products")
                .method("GET")
                .willRespondWith()
                .status(200)
                .body("{"responsetest": true}")
                .toPact();
    }

}

application.yaml which is added in main and test.

pactbroker:
  host: https://pact-broker.qmtools.app.schwarz:8443/