Add tests

Author: zguesmi

src/main/java/com/iexec/worker/docker/DockerClientService.java

@@ -408,7 +408,7 @@ DockerClient getClient() {
      * @param imageName
      * @return imageName without registry url
      */
-    private String normalizeImageName(String imageName) {
+    public String normalizeImageName(String imageName) {
         // TODO: check image tag here.
         if (StringUtils.isEmpty(imageName)) {
             return "";

src/test/java/com/iexec/worker/docker/DockerClientServiceTests.java

@@ -40,7 +40,6 @@
 
 import static com.iexec.worker.docker.DockerClientService.WORKER_DOCKER_NETWORK;
 import static org.assertj.core.api.Assertions.assertThat;
-import static org.mockito.ArgumentMatchers.any;
 import static org.mockito.Mockito.*;
 
 
@@ -628,6 +627,30 @@ public void shouldNotRemoveContainerSinceDockerCmdException() {
         assertThat(dockerClientService.removeContainer(getRandomString())).isFalse();
     }
 
+    @Test
+    public void shouldRemoveRegistryUrlFromImageName() {
+        assertThat(
+                dockerClientService
+                        .normalizeImageName("registry/namespace/image:tag")
+        ).isEqualTo("namespace/image:tag");
+    }
+
+    @Test
+    public void shouldAcceptImageNameWithoutRegistryUrl() {
+        assertThat(
+                dockerClientService
+                        .normalizeImageName("namespace/image:tag")
+        ).isEqualTo("namespace/image:tag");
+    }
+
+    @Test
+    public void ShouldAcceptOfficialImageName() {
+        assertThat(
+                dockerClientService
+                        .normalizeImageName("official:tag")
+        ).isEqualTo("official:tag");
+    }
+
     private String getRandomString() {
         return RandomStringUtils.randomAlphanumeric(20);
     }