String progressDisplayName = identityPath.toString();
        if (identityPath.equals(Path.ROOT)) {
            progressDisplayName = "root project";
        }

        return BuildOperationDescriptor.displayName(displayName)
            .metadata(BuildOperationCategory.CONFIGURE_PROJECT)
            .progressDisplayName(progressDisplayName)

        setup:
        def buildOperation = Mock(BuildOperation)
        def details = Mock(Object)
        def operationDetailsBuilder = displayName("<some-operation>").name("<op>").progressDisplayName("<some-op>").details(details)
        def worker = Mock(BuildOperationWorker)
        BuildOperationDescriptor descriptorUnderTest
        BuildOperationState operationStateUnderTest

        when:

                    return BuildOperationDescriptor.displayName("Unpack build cache entry " + key.getHashCode())
                        .details(new UnpackOperationDetails(key, file.length()))
                        .progressDisplayName("Unpacking build cache entry");
                }
            });
        }

        private BuildCacheLoadResult doUnpack(CacheableEntity entity, InputStream input) throws IOException {

                        String displayName = "Resolving configurations of " + project.getDisplayName();
                        return BuildOperationDescriptor.displayName(displayName)
                            .progressDisplayName(displayName);
                    }
                });
            }
        });
    }

    private void computeChecksumsConcurrently(SignatureVerificationService signatureVerificationService) {

        }

        @Override
        public BuildOperationDescriptor.Builder description() {
            return BuildOperationDescriptor
                .displayName("Toolchain detection")
                .progressDisplayName("Detecting local java toolchains");
        }
    }

    @NonNullApi
    private static class Installations {

        private final Supplier<Set<InstallationLocation>> initializer;

                    return BuildOperationDescriptor.displayName("Build model '" + modelName + "' for " + targetDisplayName.getDisplayName()).
                        progressDisplayName("Building model '" + modelName + "'").details(new QueryToolingModelBuildOperationType.Details() {
                            @Override
                            public String getBuildPath() {

                    public BuildOperationDescriptor.Builder description() {
                        return BuildOperationDescriptor.displayName("Fetching public key")
                            .progressDisplayName("Downloading public key " + toLongIdHexString(keyId));
                    }
                });
            } else {
                if (fingerprints.value != null) {

                        public BuildOperationDescriptor.Builder description() {
                            return BuildOperationDescriptor.displayName("Dependency verification")
                                .progressDisplayName("Verifying " + ve.artifact);
                        }
                    });
                }
            }
        });

    }

    @Override

        }

        @Override
        public BuildOperationDescriptor.Builder description() {
            return BuildOperationDescriptor
                .displayName(displayName)
                .progressDisplayName(displayName);
        }
    }

    private static class ToolchainDownloadFailureTracker {

        private final Map<String, Exception> resolveFailures = new TreeMap<>();

            String basicName = subjectName + " with " + transformStepName;
            return BuildOperationDescriptor.displayName("Transform " + basicName)
                .progressDisplayName(TRANSFORMING_PROGRESS_PREFIX + basicName)
                .metadata(BuildOperationCategory.TRANSFORM)