To do that, we declare a method `__call__`:

{* ../../docs_src/dependencies/tutorial011_an_py39.py hl[12] *}

In this case, this `__call__` is what **FastAPI** will use to check for additional parameters and sub-dependencies, and this is what will be called to pass a value to the parameter in your *path operation function* later.

## Parameterize the instance { #parameterize-the-instance }

            int startIndex = 50;
            echoRequest.writeBytesWireFormat(buffer, startIndex);

            // Check bytes before written area are unchanged
            for (int i = 0; i < startIndex; i++) {
                assertEquals((byte) 0xFF, buffer[i]);
            }

            // Check bytes after written area are unchanged
            for (int i = startIndex + 4; i < buffer.length; i++) {

Use the `TestClient` object the same way as you do with `httpx`.

Write simple `assert` statements with the standard Python expressions that you need to check (again, standard `pytest`).

{* ../../docs_src/app_testing/tutorial001.py hl[2,12,15:18] *}

/// tip

Notice that the testing functions are normal `def`, not `async def`.

	assumeRole          = "AssumeRole"

	stsRequestBodyLimit = 10 * (1 << 20) // 10 MiB

	// JWT claim keys
	expClaim = "exp"
	subClaim = "sub"
	audClaim = "aud"
	issClaim = "iss"

	// JWT claim to check the parent user
	parentClaim = "parent"

	// LDAP claim keys
	ldapUser       = "ldapUser"       // this is a key name for a normalized DN value
	ldapActualUser = "ldapActualUser" // this is a key name for the actual DN value

        authenticator.parseJwtClaim(jwtClaim, attributes);

        // Verify
        assertEquals("1234567890", attributes.get("sub"));
        assertEquals("John Doe", attributes.get("name"));

        // Check groups array
        final String[] groups = DocumentUtil.getValue(attributes, "groups", String[].class);
        assertArrayEquals(new String[] { "group1", "group2" }, groups);

    @Test
    void testRetainPayload() {
        // Initially, retainPayload should be false
        assertFalse(message.isRetainPayload(), "isRetainPayload should be false initially");

        // Call retainPayload and check if it becomes true
        message.retainPayload();
        assertTrue(message.isRetainPayload(), "isRetainPayload should be true after calling retainPayload");
    }

    @Test
    void testSetAndGetRawPayload() {

    <function-signature>java.lang.String base64(java.lang.String)</function-signature>
    <example>
      ${fe:base64(value)}
    </example>
  </function>

  <function>
    <description>
      Check if a file exists.
    </description>
    <name>fileExists</name>
    <function-class>org.codelibs.fess.taglib.FessFunctions</function-class>
    <function-signature>boolean fileExists(java.lang.String)</function-signature>

        assertTrue(fessUserBean.hasRole("user"));
        assertTrue(fessUserBean.hasRole("manager"));
        assertFalse(fessUserBean.hasRole("guest"));

        // Test with null check
        assertFalse(fessUserBean.hasRole(null));
    }

    public void test_hasRoles() {
        // Test with no roles
        testUser.setRoleNames(new String[] {});

        size,
        getMultiset().size());
  }

  /** Call the {@code setCount()} method under test, and check its return value. */
  abstract void setCountCheckReturnValue(E element, int count);

  /**
   * Call the {@code setCount()} method under test, but do not check its return value. Callers
   * should use this method over {@link #setCountCheckReturnValue(Object, int)} when they expect

    Function<String, @Nullable Integer> function = Functions.forMap(map, null);

    assertEquals((Integer) 1, function.apply("One"));
    assertNull(function.apply("Two"));

    // check basic sanity of equals and hashCode
    new EqualsTester()
        .addEqualityGroup(function)
        .addEqualityGroup(Functions.forMap(map, 1))
        .testEquals();
  }

  @J2ktIncompatible