Add iOS test

tests/integration/ios/DylibExample/DylibExampleTests/DylibExampleTests.swift

@@ -0,0 +1,33 @@
+//
+//  DylibExampleTests.swift
+//  DylibExampleTests
+//
+//  Created by Nathan Horrigan on 15/08/2021.
+//
+
+import XCTest
+@testable import DylibExample
+
+class DylibExampleTests: XCTestCase {
+
+    override func setUpWithError() throws {
+        // Put setup code here. This method is called before the invocation of each test method in the class.
+    }
+
+    override func tearDownWithError() throws {
+        // Put teardown code here. This method is called after the invocation of each test method in the class.
+    }
+
+    func testExample() throws {
+        let sum = calculate_sum(5, 2)
+        assert(sum == 7, "WASM loaded successfully")
+    }
+
+    func testPerformanceExample() throws {
+        // This is an example of a performance test case.
+        self.measure {
+            // Put the code you want to measure the time of here.
+        }
+    }
+
+}