test: added testing for rw and pk insert and read

src/database/table.rs

@@ -18,16 +18,16 @@ impl Table {
     Table { indexes: vec![], rows: HashMap::new(), name: name.to_string(), pk_key: pk_key.to_string() }
   }
 
-  pub fn from_file(file_path: String) -> Table {
+  pub fn from_file(file_path: String) -> Result<Table, &'static str> {
     let serialized = fs::read_to_string(file_path);
     if serialized.is_err() {
-      panic!("Failed loading from file");
+      return Err("Failed loading from file");
     }
     let table: Table = serde_json::from_str(&serialized.unwrap()).unwrap();
-    return table;
+    return Ok(table);
   }
   
-  pub fn to_file(&self, file_path: String) {
+  pub fn to_file(&self, file_path: &'static str) {
 
     let serialized = serde_json::to_string(self).unwrap();
     println!("serialized = {}", serialized);
@@ -39,15 +39,16 @@ impl Table {
 
 
   pub fn create_index(&mut self, index: Index) {
+    // TODO: Add row indexes to the index itself before pushing to the table
     self.indexes.push(index)
   }
 
-  pub fn find_by_pk(&self, value: &u64) -> &Row {
+  pub fn find_by_pk(&self, value: &u64) -> Result<&Row, &'static str> {
     let row = self.rows.get(value);
     if row.is_none() {
-      panic!("Row not found!");
+      return Err("Row not found!");
     }
-    return row.unwrap().clone();
+    Ok(row.unwrap().clone())
   }
 
   pub fn insert_row(&mut self, row: Row) {

src/main.rs

@@ -1,34 +1,16 @@
-use serde_json::Value;
 
 macro_rules! hashmap {
     ($( $key: expr => $val: expr ),*) => {{
-         let mut map: ::std::collections::HashMap<String, Value> = ::std::collections::HashMap::new();
+         let mut map: ::std::collections::HashMap<String, ::serde_json::Value> = ::std::collections::HashMap::new();
          $( map.insert($key.to_string(), serde_json::to_value($val).unwrap()); )*
          map
     }}
 }
-use database::{table::Table, row::Row};
 
 mod database;
 
-
-
 fn main() {
-    let mut table: Table = Table::new("Cats", "id");
-    table.insert_row(Row::new(hashmap!["id" => 1, "name" => "Ozzy"]));
-    table.insert_row(Row::new(hashmap!["id" => 2, "name" => "Simon"]));
-
-    let row = table.find_by_pk(&1u64);
-    let pretty_print = serde_json::to_string_pretty(row);
-    
-    println!("Found Row: {}", pretty_print.unwrap());
-    let row = table.find_by_pk(&2u64);
-    let pretty_print = serde_json::to_string_pretty(row);
-    
-    println!("Found Row: {}", pretty_print.unwrap());
-    let row = table.find_by_pk(&3u64);
-    let pretty_print = serde_json::to_string_pretty(row);
-    
-    println!("Failed to Find Row: {}", pretty_print.unwrap());
-
 }
+
+#[cfg(test)]
+mod tests;

src/tests/mod.rs

@@ -0,0 +1 @@
+mod table_test;

src/tests/table_test.rs

@@ -0,0 +1,55 @@
+#[cfg(test)]
+mod tests {
+    use std::{fs, path::Path};
+
+    use crate::database::{table::Table, row::Row};
+
+    #[test]
+    fn should_find_two_rows() {
+        let mut table: Table = Table::new("Cats", "id");
+        table.insert_row(Row::new(hashmap!["id" => 1, "name" => "Ozzy"]));
+        table.insert_row(Row::new(hashmap!["id" => 2, "name" => "Simon"]));
+
+        let row = table.find_by_pk(&1u64);
+        assert_eq!(row.is_err(), false);
+        let pretty_print = serde_json::to_string_pretty(row.unwrap());
+
+        println!("Found Row: {}", pretty_print.unwrap());
+        let row = table.find_by_pk(&2u64);
+        let pretty_print = serde_json::to_string_pretty(row.unwrap());
+
+        println!("Found Row: {}", pretty_print.unwrap());
+    }
+
+    #[test]
+    fn should_fail_to_find_row() {
+        let mut table: Table = Table::new("Cats", "id");
+        table.insert_row(Row::new(hashmap!["id" => 1, "name" => "Ozzy"]));
+        table.insert_row(Row::new(hashmap!["id" => 2, "name" => "Simon"]));
+
+        let row = table.find_by_pk(&3u64);
+        assert_eq!(row.is_err(), true);
+    }
+
+
+    #[test]
+    fn should_write_and_read_to_file() {
+        let mut table: Table = Table::new("Cats", "id");
+        table.insert_row(Row::new(hashmap!["id" => 1, "name" => "Ozzy"]));
+        table.insert_row(Row::new(hashmap!["id" => 2, "name" => "Simon"]));
+        table.to_file("./db.json");
+
+        let exists = Path::try_exists(Path::new("./db.json"));
+        assert_eq!(exists.unwrap(), true);
+
+        let table = Table::from_file("./db.json".to_owned());
+        assert_eq!(table.is_ok(), true);
+
+        let binding = table.unwrap();
+        let row = binding.find_by_pk(&1u64);
+        assert_eq!(row.is_ok(), true);
+
+        // Cleanup file
+        fs::remove_file("./db.json");
+    }
+}