test: added testing for rw and pk insert and read

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");
+    }
+}