# Classes as Dependencies { #classes-as-dependencies }

Before diving deeper into the **Dependency Injection** system, let's upgrade the previous example.

## A `dict` from the previous example { #a-dict-from-the-previous-example }

In the previous example, we were returning a `dict` from our dependency ("dependable"):

{* ../../docs_src/dependencies/tutorial001_an_py310.py hl[9] *}

	if _, ok := args["groups"]; !ok {
		if len(groups) > 0 {
			args["groups"] = groups
		}
	}

	return args
}

// PolicyToBucketAccessPolicy converts a MinIO policy into a minio-go policy data structure.
func PolicyToBucketAccessPolicy(bucketPolicy *policy.BucketPolicy) (*miniogopolicy.BucketAccessPolicy, error) {
	// Return empty BucketAccessPolicy for empty bucket policy.

    /**
     * The expiration time for the filter cache in seconds.
     */
    protected int filterCacheExpireAfterWrite = 10; // 10sec

    /**
     * The maximum number of items to load into the cache.
     */
    protected int maxLoadSize = 10000;

    /**
     * Creates a new instance of OpenSearchUrlFilterService.
     * @param crawlerConfig The crawler configuration.
     */

   */
  public void add(Runnable runnable, Executor executor) {
    // Fail fast on a null. We throw NPE here because the contract of Executor states that it throws
    // NPE on null listener, so we propagate that contract up into the add method as well.
    checkNotNull(runnable, "Runnable was null.");
    checkNotNull(executor, "Executor was null.");

    // Lock while we check state. We must maintain the lock while adding the new pair so that

		if cdiskCount != testCase.diskCount {
			t.Errorf("Test %d: Expected %d, got %d", i+1, testCase.diskCount, cdiskCount)
		}
	}
}

// Test for reduceErrs, reduceErr reduces collection
// of errors into a single maximal error with in the list.
func TestReduceErrs(t *testing.T) {
	canceledErrs := make([]error, 0, 5)
	for i := range 5 {
		canceledErrs = append(canceledErrs, fmt.Errorf("error %d: %w", i, context.Canceled))
	}

	return arm64.IsAtomicInstruction(op)
}

// IsARM64TBL reports whether the op (as defined by an arm64.A*
// constant) is one of the TBL-like instructions and one of its
// inputs does not fit into prog.Reg, so require special handling.
func IsARM64TBL(op obj.As) bool {
	switch op {
	case arm64.AVTBL, arm64.AVTBX, arm64.AVMOVQ:
		return true
	}
	return false
}

	// Add the content-encoding string, set to gzip.
	contentEncodingConditionStr := fmt.Sprintf(`["eq", "$content-encoding", "%s"]`, "gzip")

	// Combine all conditions into one string.
	conditionStr := fmt.Sprintf(`"conditions":[%s, %s, %s, %s, %s, %s, %s, %s]`, bucketConditionStr,

        }
        dr.domain = n.getDomain();
        return dr;
    }

    /*
     * Split DFS path like \fs1.example.com\root5\link2\foo\bar.txt into at
     * most 3 components (not including the first index which is always empty):
     * result[0] = ""
     * result[1] = "fs1.example.com"
     * result[2] = "root5"
     * result[3] = "link2\foo\bar.txt"
     */

        verify(cifsContext, atLeastOnce()).getConfig();
        verify(configuration, atLeastOnce()).getOemEncoding();
    }

    @Test
    @DisplayName("E: splits 7-byte keys into 8-byte DES blocks and concatenates")
    void testE_blockSplitConsistency() throws ShortBufferException {
        // Arrange
        byte[] key14 = hex("01020304050607 11121314151617"); // two 7-byte chunks

			},
			region:   "",
			expected: ErrUnsignedHeaders,
		},
	}

	// Run each test case individually.
	for i, testCase := range testCases {
		// Turn the map[string]string into map[string][]string, because Go.
		query := url.Values{}
		for key, value := range testCase.queryParams {
			query.Set(key, value)
		}

		// Create a request to use.