Make cargo run work

tests/dev_cargo_bins.rs

@@ -0,0 +1,39 @@
+// Makes sure that `dev/Cargo.toml` is synced with `info.toml`.
+// When this test fails, you just need to run `cargo run --bin gen-dev-cargo-toml`.
+
+use serde::Deserialize;
+use std::fs;
+
+#[derive(Deserialize)]
+struct Exercise {
+    name: String,
+    path: String,
+}
+
+#[derive(Deserialize)]
+struct InfoToml {
+    exercises: Vec<Exercise>,
+}
+
+#[test]
+fn dev_cargo_bins() {
+    let content = fs::read_to_string("exercises/Cargo.toml").unwrap();
+
+    let exercises = toml_edit::de::from_str::<InfoToml>(&fs::read_to_string("info.toml").unwrap())
+        .unwrap()
+        .exercises;
+
+    let mut start_ind = 0;
+    for exercise in exercises {
+        let name_start = start_ind + content[start_ind..].find('"').unwrap() + 1;
+        let name_end = name_start + content[name_start..].find('"').unwrap();
+        assert_eq!(exercise.name, &content[name_start..name_end]);
+
+        // +3 to skip `../` at the begeinning of the path.
+        let path_start = name_end + content[name_end + 1..].find('"').unwrap() + 5;
+        let path_end = path_start + content[path_start..].find('"').unwrap();
+        assert_eq!(exercise.path, &content[path_start..path_end]);
+
+        start_ind = path_end + 1;
+    }
+}