# Background Tasks - `BackgroundTasks`

You can declare a parameter in a *path operation function* or dependency function with the type `BackgroundTasks`, and then you can use it to schedule the execution of background tasks after the response is sent.

You can import it directly from `fastapi`:

```python
from fastapi import BackgroundTasks
```

        }

        // Assert: bytes before and after region remain unchanged.
        for (int i = 0; i < dstIndex; i++) {
            assertEquals((byte) 0x55, dst[i], "Unexpected change before copy region at " + i);
        }
        for (int i = dstIndex + len; i < dst.length; i++) {
            assertEquals((byte) 0x55, dst[i], "Unexpected change after copy region at " + i);
        }
    }

    @Test

./mc ls -r --versions myminio2/testbucket >/tmp/myminio2.txt

out=$(diff -qpruN /tmp/myminio1.txt /tmp/myminio2.txt)
ret=$?
if [ $ret -ne 0 ]; then
	echo "BUG: expected no missing entries after replication: $out"
	exit 1
fi

./mc rm myminio1/testbucket/dir/file
sleep 1s

./mc ls -r --versions myminio1/testbucket >/tmp/myminio1.txt
./mc ls -r --versions myminio2/testbucket >/tmp/myminio2.txt

margin-top: 0;\n  margin-left: 0.125rem;\n}\n\n.dropright .dropdown-toggle::after {\n  display: inline-block;\n  margin-left: 0.255em;\n  vertical-align: 0.255em;\n  content: \"\";\n  border-top: 0.3em solid transparent;\n  border-right: 0;\n  border-bottom: 0.3em solid transparent;\n  border-left: 0.3em solid;\n}\n\n.dropright .dropdown-toggle:empty::after {\n  margin-left: 0;\n}\n\n.dropright .dropdown-toggle::after {\n  vertical-align: 0;\n}\n\n.dropleft .dropdown-menu {\n  top: 0;\n  right: 100%;\n  left:...

    class TimeConsistencyTests {

        @Test
        @DisplayName("Current time should be after start time")
        void testCurrentTimeAfterStart() {
            Instant now = MonotonicClock.now();
            Instant start = MonotonicClock.start();

            assertTrue(now.isAfter(start), "Current time should be after start time");
        }

        @Test

     */
    public OptionalEntity<RelatedContent> getRelatedContent(final String id) {
        return relatedContentBhv.selectByPK(id);
    }

    /**
     * Stores (inserts or updates) a related content entity.
     * After storing, updates the related content helper to refresh the cache.
     *
     * @param relatedContent the RelatedContent entity to store
     */
    public void store(final RelatedContent relatedContent) {

import java.util.concurrent.ExecutorService
import java.util.concurrent.Executors
import java.util.concurrent.TimeUnit
import kotlin.coroutines.cancellation.CancellationException
import okio.Buffer
import org.junit.After
import org.junit.Assert.assertEquals
import org.junit.Assert.assertTrue
import org.junit.Test
import org.junit.runner.RunWith

/**
 * Android HttpEngine.
 */
@RunWith(AndroidJUnit4::class)

            this.supplier = supplier;
        }

        /**
         * Executes the provided {@link Consumer} with a {@link Stream} obtained from the supplier.
         * The stream is automatically closed after the consumer is executed.
         *
         * @param stream the {@link Consumer} to process the {@link Stream}
         */
        public void of(final Consumer<Stream<T>> stream) {

With **FastAPI** it's very easy (thanks to Starlette), check the docs: [Testing](../tutorial/testing.md){.internal-link target=_blank}

After you have tests, then you can upgrade the **FastAPI** version to a more recent one, and make sure that all your code is working correctly by running your tests.

If everything is working, or after you make the necessary changes, and all your tests are passing, then you can pin your `fastapi` to that new recent version.

import java.util.NoSuchElementException;

import org.codelibs.core.exception.ClIllegalStateException;
import org.codelibs.core.exception.ClIndexOutOfBoundsException;
import org.codelibs.core.io.SerializeUtil;
import org.junit.After;
import org.junit.Before;
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.ExpectedException;

/**
 * @author higa
 *
 */
public class ArrayMapTest {

    /**