test: move unit tests out of demo app into package

Package.swift

@@ -36,6 +36,12 @@ let package = Package(
               name: "GoogleInteractiveMediaAds",
               url: "https://imasdk.googleapis.com/downloads/ima/ios/GoogleInteractiveMediaAds-ios-v3.23.0.zip",
               checksum: "6fa5ad05c4ab85d74b8aad5fdace8a069f3dbd1eb820496bc04df7aeda0cd5e0"
-        )
+        ),
+        .testTarget(
+            name: "MuxStatsGoogleIMAPluginTests",
+            dependencies: [
+                "MuxStatsGoogleIMAPlugin"
+            ]
+        ),
     ]
 )

Sources/MuxStatsGoogleIMAPluginTests/GoogleIMAEventTests.swift

@@ -0,0 +1,58 @@
+//
+//  GoogleIMAEventTests.swift
+//  MuxStatsGoogleIMAPlugin
+//
+
+import XCTest
+
+import MUXSDKStats
+
+@testable import MuxStatsGoogleIMAPlugin
+
+
+final class GoogleIMAEventTests: 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 testMuxImaListenerInitialization() throws {
+
+        let binding = try XCTUnwrap(
+            MUXSDKPlayerBinding(
+                name: "",
+                andSoftware: ""
+            )
+        )
+
+        let imaListener = MuxImaListener(
+            playerBinding: binding
+        )
+
+        XCTAssertNotNil(imaListener)
+
+    }
+
+    func testMuxImaListenerInitializationOptions() throws {
+
+        let binding = try XCTUnwrap(
+            MUXSDKPlayerBinding(
+                name: "",
+                andSoftware: ""
+            )
+        )
+
+        let imaListener = MuxImaListener(
+            playerBinding: binding,
+            options: .pictureInPicture
+        )
+
+        XCTAssertNotNil(imaListener)
+
+    }
+
+}