func newConfigDir(dir string, dirSet bool, getDefaultDir func() string) (*ConfigDir, error) {
	if dir == "" {
		dir = getDefaultDir()
	}

	if dir == "" {
		if !dirSet {
			return nil, fmt.Errorf("missing option must be provided")
		}
		return nil, fmt.Errorf("provided option cannot be empty")
	}

	// Disallow relative paths, figure out absolute paths.
	dirAbs, err := filepath.Abs(dir)
	if err != nil {
		return nil, err

        List<RelatedContent> testData = new ArrayList<>();
        testData.add(createRelatedContent("regex:", "Invalid Regex", ""));
        mockBhv.setTestData(testData);

        // Should not throw exception, just log warning
        relatedContentHelper.load();

        String[] results = relatedContentHelper.getRelatedContents("anything");
        assertEquals(0, results.length);
    }

    EnumBiMap<Currency, Country> bimap = EnumBiMap.create(map);
    assertEquals(Country.CANADA, bimap.get(Currency.DOLLAR));
    assertEquals(Currency.DOLLAR, bimap.inverse().get(Country.CANADA));

    /* Map must have at least one entry if not an EnumBiMap. */
    assertThrows(
        IllegalArgumentException.class,
        () -> EnumBiMap.create(Collections.<Currency, Country>emptyMap()));
    assertThrows(

        void openDelegatesEnsureOpenAndCloses() throws Exception {
            SmbFileInputStream in = newStream();
            in.open();
            // ensureOpen returns acquired handle; try-with-resources must close it
            verify(mockHandle, times(1)).close();
            verify(mockHandle, atLeastOnce()).acquire();
        }

        @Test

    void testWireFormatProtocolCompliance() throws SMBProtocolDecodingException {
        // Given - exact SMB2 TREE_DISCONNECT response structure
        byte[] wireData = new byte[] { 0x04, 0x00, // StructureSize (must be 4)
                0x00, 0x00 // Reserved
        };

        // When
        int bytesRead = response.readBytesWireFormat(wireData, 0);

        // Then
        assertEquals(4, bytesRead);

            readThreads[i] = new Thread(() -> {
                for (int j = 0; j < 100; j++) {
                    List<DirectoryCacheEntry.FileInfo> children = entry.getChildren();
                    // Just read, don't assert specific counts due to race conditions
                    assertNotNull(children);
                }
            });
            readThreads[i].start();
        }

private fun prepareScenariosStep(
    testProject: String,
    scenarios: List<Scenario>,
    os: Os,
): BuildSteps.() -> Unit {
    if (scenarios.isEmpty()) {
        throw IllegalArgumentException("Scenarios list must not be empty for $testProject")
    }
    val csvLines = scenarios.map { "${it.className};${it.scenario}" }
    val action = "include"
    val fileNamePostfix = "$testProject-performance-scenarios.csv"

                atTotal += pool.Available
                if atTotal > choose && pool.Available > 0 {
                        return pool.Index
                }
        }
        // Should not happen, but print values just in case.
        panic(fmt.Errorf("reached end of serverPools (total: %v, atTotal: %v, choose: %v)", total, atTotal, choose))
}
```

## Other usages

### Advanced use cases with multiple ellipses

	size := r.ContentLength

	rAuthType := getRequestAuthType(r)
	// For auth type streaming signature, we need to gather a different content length.
	switch rAuthType {
	// Check signature types that must have content length
	case authTypeStreamingSigned, authTypeStreamingSignedTrailer, authTypeStreamingUnsignedTrailer:
		if sizeStr, ok := r.Header[xhttp.AmzDecodedContentLength]; ok {
			if sizeStr[0] == "" {

You do that with standard modern Python types.

You don't have to learn a new syntax, the methods or classes of a specific library, etc.

Just standard **Python**.

For example, for an `int`:

```Python
item_id: int
```

or for a more complex `Item` model:

```Python
item: Item
```