def get_widget(self) -> PieChart:
        """
        Return the pie chart.

        Returns:
            The pie chart.

        """
        pie = PieChart(title="Dramatic Colors")
        pie.set_categories(
            ["January", "February", "March", "April", "May", "June", "July"]
        )
        pie.add_dataset([75, 44, 92, 11, 44, 95, 35])
        return pie

class TestDoughnutChart(DoughnutChart):
    """
    Test doughnut chart with ChartJS.
    """

    #: Whether to show the legend.
    legend = True
    #: The position of the legend.
    legend_position = "right"
    #: Whether to color the chart.
    color = False

    def get_categories(self) -> list[str]:
        """
        Return names of categories.

        Returns:
            A list of names of categories.

        """
        return ["January", "February", "March", "April", "May", "June", "July"]

    def get_dataset(self) -> list[int]:
        """
        Return a dataset.

        Returns:
            A list of values for the dataset.

        """
        return [75, 44, 92, 11, 44, 95, 53]

class TestChart(StackedBarChart):
    """
    Test chart with ChartJS.
    """

    def get_categories(self) -> list[str]:
        """
        Return 7 labels for the x-axis.

        Returns:
            A list of 7 labels for the x-axis.

        """
        return ["January", "February", "March", "April", "May", "June", "July"]

    def get_dataset_labels(self) -> list[str]:
        """
        Return names of datasets.

        Returns:
            A list of names of datasets.

        """
        return [
            "Central",
            "Eastside",
            "Westside",
            "Central2",
            "Eastside2",
            "Westside2",
            "Central3",
            "Eastside3",
            "Westside3",
        ]

    def get_datasets(self) -> list[list[float]]:
        """Return 3 datasets to plot."""
        return [
            [750, 440, 920, 1100, 440, 950, 350],
            [410, 1920, 180, 300, 730, 870, 920],
            [870, 210, 940, 3000, 900, 130, 650],
            [750, 440, 920, 1100, 440, 950, 350],
            [410, 920, 180, 2000, 730, 870, 920],
            [870, 210, 940, 300, 900, 130, 650],
            [750, 440, 920, 1100, 440, 950, 3500],
            [410, 920, 180, 3000, 730, 870, 920],
            [870, 210, 940, 300, 900, 130, 650],
        ]

    def get_widget(self) -> HorizontalStackedBarChart:
        """
        Return the horizontal bar chart.

        Returns:
            The horizontal bar chart.

        """
        barchart = HorizontalStackedBarChart(
            title="Formage Through July",
            money=True,
            legend=True,
            width="500",
            color=False,
        )
        barchart.set_categories(
            ["January", "February", "March", "April", "May", "June", "July"]
        )
        barchart.add_dataset([75, 44, 92, 11, 44, 95, 35], "Central")
        barchart.add_dataset([41, 92, 18, 35, 73, 87, 92], "Eastside")
        barchart.add_dataset([87, 21, 94, 13, 90, 13, 65], "Westside")
        return barchart

class TestHistogram(Histogram):
    """
    Test histogram with ChartJS.
    """

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        mu = 0
        sigma = 50
        nums = []
        bin_count = 40
        for _ in range(10000):
            temp = random.gauss(mu, sigma)
            nums.append(temp)

        self.build(nums, bin_count)

class TestHorizontalHistogram(HorizontalHistogram):
    """
    Test horizontal histogram with ChartJS.
    """

    #: Whether to color the chart.
    color = False

    def load(self) -> None:
        """
        Load the histogram data.

        """
        mu = 100
        sigma = 30
        nums = []
        bin_count = 50
        for _ in range(10000):
            temp = random.gauss(mu, sigma)
            nums.append(temp)

        self.build(nums, bin_count)