assertEqualCharNodes(Iterables.limit(result, 2), "ab");
    assertThat(graph.requestedNodes).containsExactly('a', 'a', 'b');

    // Iterate again to see if calculation is done again
    assertEqualCharNodes(Iterables.limit(result, 2), "ab");
    assertThat(graph.requestedNodes).containsExactly('a', 'a', 'a', 'b', 'b');
  }

  @Test

    assertEqualCharNodes(Iterables.limit(result, 2), "ab");
    assertThat(graph.requestedNodes).containsExactly('a', 'a', 'b');

    // Iterate again to see if calculation is done again
    assertEqualCharNodes(Iterables.limit(result, 2), "ab");
    assertThat(graph.requestedNodes).containsExactly('a', 'a', 'a', 'b', 'b');
  }

  @Test

				{Name: "newPrefix1"},
				{Name: "newzen/zen/recurse/again/again/again/pics"},
				{Name: "obj0"},
				{Name: "obj1"},
				{Name: "obj2"},
			},
		},
		// ListObjectsResult-10.
		// marker is set to "newPrefix1" in the testCase, (testCase 34).
		10: {
			IsTruncated: false,
			Objects: []ObjectInfo{
				{Name: "newzen/zen/recurse/again/again/again/pics"},
				{Name: "obj0"},
				{Name: "obj1"},

              case 1:
                return 1;
              case 2:
                return endOfData();
              default:
                throw new AssertionError("Should not have been invoked again");
            }
          }
        };

    assertTrue(iter.hasNext());
    assertEquals(0, (int) iter.next());

    // verify idempotence of hasNext()
    assertTrue(iter.hasNext());

#### `lru_cache` Technical Details { #lru-cache-technical-details }

`@lru_cache` modifies the function it decorates to return the same value that was returned the first time, instead of computing it again, executing the code of the function every time.

   * If there are already enough connections, we're done.
   * If not, we create one and then schedule the task to run again immediately.
   */
  private fun openConnections(state: AddressState): Long {
    // This policy does not require minimum connections, don't run again
    if (state.policy.minimumConcurrentCalls == 0) return -1L

    var concurrentCallCapacity = 0
    for (connection in connections) {

        // Test getInstance when no instance has been set
        // Should default to System.err
        LogStream instance = LogStream.getInstance();
        assertNotNull(instance);

        // Getting instance again should return the same instance
        LogStream instance2 = LogStream.getInstance();
        assertSame(instance, instance2);
    }

    @Test
    void testSetInstanceAndGetInstance() {

### Delete a Hero Again { #delete-a-hero-again }

**Deleting** a hero stays pretty much the same.

We won't satisfy the desire to refactor everything in this one. 😅

{* ../../docs_src/sql_databases/tutorial002_an_py310.py ln[96:103] hl[101] *}

### Run the App Again { #run-the-app-again }

You can run the app again:

<div class="termy">

```console

errors.app.illegal.transition = Illegal transition. Please try again.
errors.app.db.already.deleted = It may have been deleted by another process. Please try again.
errors.app.db.already.updated = It may have been updated by another process. Please try again.
errors.app.db.already.exists = The data already exists. Please try again.
errors.app.double.submit.request = It may have been processed before this request. Please try again.

errors.app.illegal.transition = Illegal transition. Please try again.
errors.app.db.already.deleted = It may have been deleted by another process. Please try again.
errors.app.db.already.updated = It may have been updated by another process. Please try again.
errors.app.db.already.exists = The data already exists. Please try again.
errors.app.double.submit.request = It may have been processed before this request. Please try again.