## Recap

* Import `FastAPI`.
* Create an `app` instance.
* Write a **path operation decorator** using decorators like `@app.get("/")`.
* Define a **path operation function**; for example, `def root(): ...`.

public class SetOperationsTest extends TestCase {
  @J2ktIncompatible
  @GwtIncompatible // suite
  public static Test suite() {
    TestSuite suite = new TestSuite();

    suite.addTest(
        SetTestSuiteBuilder.using(
                new TestStringSetGenerator() {
                  @Override
                  protected Set<String> create(String[] elements) {

    return emptySet();
  }

  protected Collection<Method> suppressForConcurrentSkipListSetWithComparator() {
    return emptySet();
  }

  public Test testsForEmptySet() {
    return SetTestSuiteBuilder.using(
            new TestStringSetGenerator() {
              @Override
              public Set<String> create(String[] elements) {
                return emptySet();
              }
            })

  }

  protected Collection<Method> suppressForConcurrentSkipListSetWithComparator() {
    return emptySet();
  }

  public Test testsForCheckedNavigableSet() {
    return SortedSetTestSuiteBuilder.using(
            new TestStringSortedSetGenerator() {
              @Override
              public NavigableSet<String> create(String[] elements) {
                NavigableSet<String> innerSet = new TreeSet<>();

public class SetOperationsTest extends TestCase {
  @J2ktIncompatible
  @GwtIncompatible // suite
  public static Test suite() {
    TestSuite suite = new TestSuite();

    suite.addTest(
        SetTestSuiteBuilder.using(
                new TestStringSetGenerator() {
                  @Override
                  protected Set<String> create(String[] elements) {

        MapEntrySetTester.getSetValueWithNullValuesAbsentMethod(),
        MapEntrySetTester.getSetValueWithNullValuesPresentMethod());
  }

  public Test testsForCheckedMap() {
    return MapTestSuiteBuilder.using(
            new TestStringMapGenerator() {
              @Override
              protected Map<String, String> create(Entry<String, String>[] entries) {

    // Not testing rowKeySet() or columnKeySet() of Table.transformValues()
    // since the transformation doesn't affect the row and column key sets.

    suite.addTest(
        SetTestSuiteBuilder.using(
                new TestStringSetGenerator() {
                  @Override
                  protected Set<String> create(String[] elements) {
                    Table<String, Integer, Character> table =

    // Not testing rowKeySet() or columnKeySet() of Table.transformValues()
    // since the transformation doesn't affect the row and column key sets.

    suite.addTest(
        SetTestSuiteBuilder.using(
                new TestStringSetGenerator() {
                  @Override
                  protected Set<String> create(String[] elements) {
                    Table<String, Integer, Character> table =

        MapEntrySetTester.getSetValueWithNullValuesAbsentMethod(),
        MapEntrySetTester.getSetValueWithNullValuesPresentMethod());
  }

  public Test testsForCheckedMap() {
    return MapTestSuiteBuilder.using(
            new TestStringMapGenerator() {
              @Override
              protected Map<String, String> create(Entry<String, String>[] entries) {

Routes are declared in a single place, using functions declared in other places (instead of using decorators that can be placed right on top of the function that handles the endpoint). This is closer to how Django does it than to how Flask (and Starlette) does it. It separates in the code things that are relatively tightly coupled.

/// check | "Inspired **FastAPI** to"