feat: Add all tests from #55 except sowing, watering, and harvesting

tests/config.rs

@@ -0,0 +1,54 @@
+use pomomon_garden::features::config::components::GameConfig;
+use std::fs;
+use std::io::Write;
+use uuid::Uuid;
+
+// Helper function to create a temporary file with content
+fn create_temp_file(content: &str) -> (std::path::PathBuf, String) {
+    let filename = format!("test_config_{}.json", Uuid::new_v4());
+    let temp_dir = std::env::temp_dir();
+    let filepath = temp_dir.join(&filename);
+
+    let mut file = fs::File::create(&filepath).expect("Could not create temp file");
+    file.write_all(content.as_bytes())
+        .expect("Could not write to temp file");
+
+    (filepath, filename)
+}
+
+#[test]
+fn test_load_valid_config() {
+    let (filepath, _filename) = create_temp_file(
+        r#"{
+            "grid_width": 10,
+            "grid_height": 5,
+            "pom_speed": 2.0
+        }"#,
+    );
+
+    let config = GameConfig::read_from_path(&filepath).expect("Failed to read valid config");
+    assert_eq!(config.grid_width, 10);
+    assert_eq!(config.grid_height, 5);
+    assert_eq!(config.pom_speed, 2.0);
+
+    fs::remove_file(filepath).expect("Failed to delete temp file");
+}
+
+#[test]
+fn test_load_invalid_config() {
+    let (filepath, _filename) = create_temp_file(r#"this is not valid json"#);
+
+    let config = GameConfig::read_from_path(&filepath);
+    assert!(config.is_none(), "Expected invalid config to return None");
+
+    fs::remove_file(filepath).expect("Failed to delete temp file");
+}
+
+#[test]
+fn test_load_missing_config() {
+    let temp_dir = std::env::temp_dir();
+    let filepath = temp_dir.join("non_existent_config.json");
+
+    let config = GameConfig::read_from_path(&filepath);
+    assert!(config.is_none(), "Expected missing config to return None");
+}