public void setUp() throws Exception {
        super.setUp();
    }

    @Override
    public void tearDown() throws Exception {
        super.tearDown();
    }

    // Basic test to verify test framework is working
    public void test_basicAssertion() {
        assertTrue(true);
        assertFalse(false);
        assertNotNull("test");
        assertEquals(1, 1);
    }

    public void setUp() throws Exception {
        super.setUp();
    }

    @Override
    public void tearDown() throws Exception {
        super.tearDown();
    }

    // Basic test to verify test framework is working
    public void test_basicAssertion() {
        assertTrue(true);
        assertFalse(false);
        assertNotNull("test");
        assertEquals(1, 1);
    }

    public void setUp() throws Exception {
        super.setUp();
    }

    @Override
    public void tearDown() throws Exception {
        super.tearDown();
    }

    // Basic test to verify test framework is working
    public void test_basicAssertion() {
        assertTrue(true);
        assertFalse(false);
        assertNotNull("test");
        assertEquals(1, 1);
    }

Actually, all (or most) of the web frameworks work in this same way.

You never call those functions directly. They are called by your framework (in this case, **FastAPI**).

  @CollectionFeature.Require(SERIALIZABLE)
  /*
   * As the class docs say, this test only makes sense for collections that define equals().
   * Accordingly, our testing framework adds it only when testing an implementation of List, Set, or
   * Multiset.
   */
  @SuppressWarnings("UndefinedEquals")
  public void testReserialize() {

 */
package org.codelibs.core.lang;

import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.Map;

import junit.framework.TestCase;

/**
 * @author shot
 */
public class ModifierUtilTest extends TestCase {

    /**
     * @throws Exception
     */
    public void testIsPublic() throws Exception {

 */
package org.codelibs.core.xml;

import java.io.IOException;

import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;

import junit.framework.TestCase;

import org.codelibs.core.io.ResourceUtil;
import org.xml.sax.Attributes;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;

/**

import static com.google.common.base.Preconditions.checkState;
import static com.google.common.truth.Truth.assertThat;
import static java.util.concurrent.TimeUnit.SECONDS;
import static junit.framework.Assert.fail;

import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;
import java.util.concurrent.TimeoutException;
import org.jspecify.annotations.Nullable;

 * governing permissions and limitations under the License.
 */
package org.codelibs.core.convert;

import java.text.DecimalFormatSymbols;
import java.util.Locale;

import junit.framework.TestCase;

import org.codelibs.core.misc.LocaleUtil;

/**
 * @author shot
 *
 */
public class NumberConversionUtilTest extends TestCase {

    /**
     * @throws Exception
     */

En realidad, todos (o la mayoría) de los frameworks web funcionan de esta misma manera.

Nunca llamas directamente a esas funciones. Son llamadas por tu framework (en este caso, **FastAPI**).