WIP test: improve in memory test by reading from migrations folder

Docs used:
- https://doc.rust-lang.org/book/ch12-02-reading-a-file.html
- https://doc.rust-lang.org/std/fs/fn.read_dir.html

src/db/migrations.rs

@@ -0,0 +1,43 @@
+use anyhow::{Ok, Result};
+use std;
+
+fn get_first_sql_file_path() -> anyhow::Result<String> {
+    let mut entries = std::fs::read_dir("migrations")?
+        .map(|res| res.map(|entry| entry.path()))
+        .collect::<Result<Vec<_>, std::io::Error>>()?;
+
+    entries.sort();
+
+    let first_entry = String::from(entries[0].to_string_lossy());
+
+    Ok(first_entry)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use std::fs;
+
+    #[test]
+    fn read_first_sql_file_in_migrations() {
+        let expect_migration = r#"-- Add migration script here
+CREATE TABLE IF NOT EXISTS contacts
+(
+id INTEGER PRIMARY KEY AUTOINCREMENT,
+first_name TEXT NOT NULL,
+last_name TEXT NOT NULL,
+display_name TEXT NOT NULL,
+email TEXT NOT NULL,
+phone_number TEXT NOT NULL
+);"#;
+
+        let file_path = get_first_sql_file_path().unwrap();
+
+        println!("{:?}", file_path);
+
+        let contents =
+            fs::read_to_string(file_path).expect("Should have been able to read the file");
+
+        assert_eq!(contents, expect_migration);
+    }
+}

src/db/mod.rs

@@ -1,6 +1,7 @@
 mod connection;
 mod contact_repo;
 mod metadata_repo;
+mod migrations;
 
 pub use connection::Connection;