when(session.getRequest()).thenReturn(executionRequest);
        ToolchainPrivate basicPrivate = mock(ToolchainPrivate.class);
        when(basicPrivate.matchesRequirements(ArgumentMatchers.<String, String>anyMap()))
                .thenReturn(false)
                .thenReturn(true);
        when(toolchainFactory_basicType.createToolchain(isA(ToolchainModel.class)))
                .thenReturn(basicPrivate);

        throw (T) t; // rely on vacuous cast
    }

    static class LazyMap<K, V> extends AbstractMap<K, V> {
        private final Supplier<Map<K, V>> supplier;
        private volatile Map<K, V> delegate;

        LazyMap(Supplier<Map<K, V>> supplier) {
            this.supplier = supplier;
        }

        @Override

        nonNull(data, "data");
        nonNull(algorithms, "algorithms");
        LinkedHashMap<ChecksumAlgorithm, ChecksumCalculator> algMap = new LinkedHashMap<>();
        algorithms.forEach(f -> algMap.put(f, f.getCalculator()));
        data.mark();
        for (ChecksumCalculator checksumCalculator : algMap.values()) {
            checksumCalculator.update(data);
            data.reset();
        }

        nonNull(data, "data");
        nonNull(algorithms, "algorithms");
        LinkedHashMap<ChecksumAlgorithm, ChecksumCalculator> algMap = new LinkedHashMap<>();
        algorithms.forEach(f -> algMap.put(f, f.getCalculator()));
        data.mark();
        for (ChecksumCalculator checksumCalculator : algMap.values()) {
            checksumCalculator.update(data);
            data.reset();
        }