Add waiting strategy to make sure that wiremock server up and running

Author: bitxon

src/main/java/org/wiremock/integrations/testcontainers/WireMockContainer.java

@@ -33,6 +33,8 @@
 import java.util.stream.Stream;
 
 import org.testcontainers.containers.GenericContainer;
+import org.testcontainers.containers.wait.strategy.Wait;
+import org.testcontainers.containers.wait.strategy.WaitStrategy;
 import org.testcontainers.images.builder.Transferable;
 import org.testcontainers.shaded.com.google.common.io.Resources;
 import org.testcontainers.utility.MountableFile;
@@ -51,6 +53,11 @@ public class WireMockContainer extends GenericContainer<WireMockContainer> {
 
     private static final String EXTENSIONS_DIR = "/var/wiremock/extensions/";
 
+    private static final WaitStrategy DEFAULT_WAITER = Wait
+            .forHttp("/__admin/mappings")
+            .withMethod("GET")
+            .forStatusCode(200);
+
     private static final int PORT = 8080;
 
     private final StringBuilder wireMockArgs;
@@ -193,6 +200,7 @@ public Integer getServerPort() {
     protected void configure() {
         super.configure();
         withExposedPorts(PORT);
+        waitingFor(DEFAULT_WAITER);
         for (Stub stub : mappingStubs.values()) {
             withCopyToContainer(Transferable.of(stub.json), MAPPINGS_DIR + stub.name + ".json");
         }