Added rust unit tests for document and users CRUD operations

types/src/database_sql.rs

@@ -3,6 +3,7 @@
 use auth::UserGroup;
 use chrono::{NaiveDate, NaiveDateTime};
 use sqlx::postgres::types::PgLTree;
+use sqlx::PgPool;
 use std::ops::Bound;
 use std::str::FromStr;
 use user::UserUpdate;
@@ -32,7 +33,7 @@ use {
 /// Connects to our backing database instance, providing high level functions
 /// for accessing the data therein.
 pub struct Database {
-    client: sqlx::Pool<sqlx::Postgres>,
+    pub client: sqlx::Pool<sqlx::Postgres>,
 }
 impl Database {
     pub fn connect(num_connections: Option<u32>) -> Result<Self> {
@@ -49,6 +50,11 @@ impl Database {
         Ok(Database { client: conn })
     }
 
+    /// Add this new constructor for testing
+    pub fn with_pool(pool: PgPool) -> Self {
+        Database { client: pool }
+    }
+
     /// Get a specific comment by id
     pub async fn comment_by_id(&self, comment_id: &Uuid) -> Result<Comment> {
         Ok(