Integer newValue = map.getInstance(Integer.class);
    assertEquals(7, (int) newValue);
    assertEquals(7, (int) map.getInstance(TypeToken.of(Integer.class)));

    // Won't compile: map.putInstance(Double.class, new Long(42));
  }

  public void testNull() {
    assertThrows(
        NullPointerException.class,
        () -> map.putInstance((TypeToken<Integer>) null, Integer.valueOf(1)));
    map.putInstance(Integer.class, null);

    Integer newValue = map.getInstance(Integer.class);
    assertEquals(7, (int) newValue);
    assertEquals(7, (int) map.getInstance(TypeToken.of(Integer.class)));

    // Won't compile: map.putInstance(Double.class, new Long(42));
  }

  public void testNull() {
    assertThrows(
        NullPointerException.class,
        () -> map.putInstance((TypeToken<Integer>) null, Integer.valueOf(1)));
    map.putInstance(Integer.class, null);

```Python hl_lines="36-42"
{!../../../docs_src/nosql_databases/tutorial001.py!}
```

### f-strings

    assertThat(formEncode(38)).isEqualTo("%26")
    assertThat(formEncode(39)).isEqualTo("%27")
    assertThat(formEncode(40)).isEqualTo("%28")
    assertThat(formEncode(41)).isEqualTo("%29")
    assertThat(formEncode(42)).isEqualTo("*")
    assertThat(formEncode(43)).isEqualTo("%2B")
    assertThat(formEncode(44)).isEqualTo("%2C")
    assertThat(formEncode(45)).isEqualTo("-")
    assertThat(formEncode(46)).isEqualTo(".")