Fixed some type issues + made request methods

Tests/USDATests/USDATests.swift

@@ -1,12 +1,62 @@
 import XCTest
-@testable import USDA
+@testable import USDA_FDC
+
+func loadEnvironment() -> [String: String] {
+    var dic: [String: String] = [:]
+    if FileManager.default.fileExists(atPath: ".env") {
+        do {
+            let contents = try String(contentsOfFile: ".env", encoding: .utf8)
+            let lines = contents.components(separatedBy: .newlines)
+
+            for line in lines {
+                let components = line.components(separatedBy: "=")
+                if components.count == 2 {
+                    let key = components[0].trimmingCharacters(in: .whitespacesAndNewlines)
+                    let value = components[1].trimmingCharacters(in: .whitespacesAndNewlines)
+                    dic[key] = value
+                }
+            }
+        } catch {
+            print("Error reading .env file: \(error)")
+        }
+    }
+    return dic
+}
 
 final class USDATests: XCTestCase {
-    func testExample() throws {
-        // XCTest Documentation
-        // https://developer.apple.com/documentation/xctest
 
-        // Defining Test Cases and Test Methods
-        // https://developer.apple.com/documentation/xctest/defining_test_cases_and_test_methods
+    var env: [String: String] {
+       loadEnvironment() 
+    }
+
+    func testFoodList() async throws {
+        let fdc = USDA_FDC_Client()
+        fdc.apiKey = env["API_KEY"] ?? ""
+        do {
+            let _ = try await fdc.getFoodList()
+        } catch {
+            throw error
+        }
+    }
+
+    func testFoodItem() async throws {
+        let fdc = USDA_FDC_Client()    
+        fdc.apiKey = env["API_KEY"] ?? ""
+        do {
+            let _ = try await fdc.getFood(.init(fdcId: 167782))
+        } catch {
+            throw error
+        }
+    }
+
+    func testFoodSearch() async throws {
+        let fdc = USDA_FDC_Client()    
+        fdc.apiKey = env["API_KEY"] ?? ""
+        do {
+            let _ = try await fdc.getFoodsSearch(.init(query: "cheddar cheese"))
+        } catch {
+            throw error
+        }
+
     }
 }