82 lines
2.1 KiB
Rust
82 lines
2.1 KiB
Rust
use std::collections::HashMap;
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#[derive(Clone)]
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pub struct Databases {
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db_map: HashMap<String, String>,
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}
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impl Databases {
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pub fn new() -> Self {
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Self {
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db_map: HashMap::new(),
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}
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}
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fn add_database(&mut self, name: &str, id: &str) -> Option<String> {
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if self.db_map.contains_key(name) {
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None
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} else {
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self.db_map.insert(name.to_string(), id.to_string());
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Some(id.to_string())
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}
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}
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fn get_database(&self, name: &str) -> Option<String> {
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self.db_map.get(name).cloned()
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}
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fn show(&self) -> Vec<String> {
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let mut names: Vec<String> = self.db_map.clone().into_keys().collect();
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names.sort();
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names
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}
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}
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#[cfg(test)]
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mod functions {
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use super::*;
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#[test]
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fn add_entry() {
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let name = "fred";
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let id = "123456";
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let mut dbs = Databases::new();
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let output = dbs.add_database(name, id);
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assert_eq!(output, Some(id.to_string()));
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let output = dbs.get_database(name);
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assert_eq!(output, Some(id.to_string()));
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}
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#[test]
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fn entry_cannot_be_over_written() {
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let name = "barney";
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let id = "abcde";
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let mut dbs = Databases::new();
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dbs.add_database(name, id);
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let output = dbs.add_database(name, "09876");
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assert_eq!(output, None);
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let output = dbs.get_database(name);
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assert_eq!(output, Some(id.to_string()));
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}
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#[test]
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fn get_bad_database() {
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let dbs = Databases::new();
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let output = dbs.get_database("missing");
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assert_eq!(output, None);
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}
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#[test]
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fn list_databases() {
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let mut dbs = Databases::new();
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dbs.add_database("zebra", "a");
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dbs.add_database("alpha", "a");
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dbs.add_database("charlie", "a");
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dbs.add_database("wilma", "a");
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dbs.add_database("frank", "a");
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let expected = ["alpha", "charlie", "frank", "wilma", "zebra"];
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let output = dbs.show();
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assert_eq!(output, expected);
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}
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}
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