Update unit tests

Author: warmkesselj

Sources/BraintreeCard/CreditCardPOSTBody.swift

@@ -21,8 +21,11 @@ struct CreditCardPOSTBody: Encodable {
         sessionId: String
     ) {
         self.creditCard = CreditCard(card: card)
-        self.authenticationInsight = card.authenticationInsightRequested
-        self.merchantAccountId = card.merchantAccountID
+        
+        if card.authenticationInsightRequested {
+            self.authenticationInsight = card.authenticationInsightRequested
+            self.merchantAccountId = card.merchantAccountID
+        }
 
         self.meta = Meta(
             integration: integration,

UnitTests/BraintreeCardTests/BTCardClient_Tests.swift

@@ -79,6 +79,7 @@ class BTCardClient_Tests: XCTestCase {
 
             guard let parameters = params as? CreditCardPOSTBody else { return }
 
+            // Nil is correct
             XCTAssertNil(parameters.authenticationInsight)
             XCTAssertNil(parameters.merchantAccountId)