ggplot-rs 0.9.2

A Rust implementation of ggplot2's Grammar of Graphics
Documentation 
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//! A-grade #60 — the library's serde ThemeConfig overlay applies onto a preset.
#![cfg(feature = "serde")]

use ggplot_rs::prelude::*;
use ggplot_rs::theme::config::{LineCfg, TextCfg, ThemeConfig};

#[test]
fn config_overrides_only_specified_elements() {
    let cfg = ThemeConfig {
        title: Some(TextCfg {
            face: Some("bold".into()),
            size: Some(20.0),
            ..Default::default()
        }),
        panel_grid_minor: Some(LineCfg {
            visible: Some(false),
            ..Default::default()
        }),
        aspect_ratio: Some(1.0),
        ..Default::default()
    };
    let theme = cfg.apply(theme_minimal()).unwrap();

    assert_eq!(theme.title.face, FontFace::Bold);
    assert_eq!(theme.title.size, 20.0);
    assert!(!theme.panel_grid_minor.visible);
    assert_eq!(theme.aspect_ratio, Some(1.0));
    // An element the config didn't touch keeps the preset's value.
    assert_eq!(theme.axis_text_x.face, FontFace::Plain);
}

#[test]
fn config_base_field_switches_preset() {
    let cfg = ThemeConfig {
        base: Some("void".into()),
        ..Default::default()
    };
    // base="void" overrides the passed-in gray base.
    let theme = cfg.apply(theme_gray()).unwrap();
    assert!(!theme.axis_text_x.visible, "theme_void hides axis text");
}