Fix TransactionManager Robolectric tests (#156)

Author: michael-paystack

build.gradle

@@ -6,7 +6,7 @@ buildscript {
             'kotlin'        : '1.7.22',
             'coroutines'    : '1.4.2',
             'pusher'        : '2.2.1',
-            'robolectric'   : '4.4',
+            'robolectric'   : '4.9.2',
             'mockito'       : '3.8.0',
             'mockito_kotlin': '2.2.0',
             'junit_ext'     : '1.1.2',

paystack/src/main/java/co/paystack/android/TransactionManager.java

@@ -285,6 +285,12 @@ private void setProcessingOn() {
         TransactionManager.PROCESSING = true;
     }
 
+
+    @VisibleForTesting
+    void setTransactionCallback(Paystack.TransactionCallback transactionCallback) {
+        this.transactionCallback = transactionCallback;
+    }
+
     private class CardAsyncTask extends AsyncTask<Void, Void, Card> {
 
         private final String publicKey;

paystack/src/test/java/co/paystack/android/TransactionManagerTest.kt

@@ -2,6 +2,7 @@ package co.paystack.android
 
 import android.util.Log
 import androidx.test.core.app.ActivityScenario
+import co.paystack.android.Paystack.TransactionCallback
 import co.paystack.android.api.ApiCallback
 import co.paystack.android.api.ChargeApiCallback
 import co.paystack.android.api.PaystackRepository
@@ -27,6 +28,20 @@ class TransactionManagerTest {
     @Mock
     lateinit var paystackRepository: PaystackRepository
 
+    private val emptyTransactionCallback = object : TransactionCallback {
+        override fun onSuccess(transaction: Transaction?) {
+        }
+
+        override fun beforeValidate(transaction: Transaction?) {
+        }
+
+        override fun showLoading(isProcessing: Boolean?) {
+        }
+
+        override fun onError(error: Throwable?, transaction: Transaction?) {
+        }
+    }
+
     @Before
     fun setup() {
         MockitoAnnotations.openMocks(this)
@@ -64,6 +79,7 @@ class TransactionManagerTest {
             .thenAnswer { Log.i(TAG, "initializeTransaction called") }
 
         val transactionManager = TransactionManager(paystackRepository)
+        transactionManager.setTransactionCallback(emptyTransactionCallback)
         transactionManager.initiateTransaction(publicKey, charge, deviceId)
 
         verify(paystackRepository).initializeTransaction(
@@ -88,6 +104,7 @@ class TransactionManagerTest {
             .thenAnswer { Log.i(TAG, "getTransactionWithAccessCode called") }
 
         val transactionManager = TransactionManager(paystackRepository)
+        transactionManager.setTransactionCallback(emptyTransactionCallback)
         transactionManager.initiateTransaction(publicKey, charge, deviceId)
 
         verify(paystackRepository).getTransactionWithAccessCode(
@@ -113,6 +130,7 @@ class TransactionManagerTest {
             }
 
         val transactionManager = TransactionManager(paystackRepository)
+        transactionManager.setTransactionCallback(emptyTransactionCallback)
         transactionManager.initiateTransaction(publicKey, charge, deviceId)
 
         verify(paystackRepository).processCardCharge(