Added Mockito helper functions (#3)

testing/build.gradle

@@ -92,6 +92,7 @@ ext {
     espresso_version = '3.4.0'
     arch_core_testing_version = '2.1.0'
     fragment_testing_version = '1.4.0'
+    mockito_version = '4.0.0'
 }
 
 dependencies {
@@ -108,5 +109,7 @@ dependencies {
     api "androidx.test.ext:junit:$android_test_junit_version"
     api "androidx.test.espresso:espresso-core:$espresso_version"
     api "androidx.test.espresso:espresso-intents:$espresso_version"
+    api "org.mockito.kotlin:mockito-kotlin:$mockito_version"
+    api "org.mockito:mockito-inline:$mockito_version"
     debugImplementation "androidx.fragment:fragment-testing:$fragment_testing_version"
 }

testing/src/main/java/ar/com/wolox/wolmo/testing/mockito/MockitoVerificationHelper.kt

@@ -0,0 +1,49 @@
+package ar.com.wolox.wolmo.testing.mockito
+
+import org.mockito.Mockito
+import org.mockito.Mockito.atLeastOnce
+import org.mockito.Mockito.times
+
+/**
+ * Use this method to verify a certain behavior happened just a single time.
+ *
+ * @param mock the mocked class.
+ * <pre>{@code
+ * verifyOnce(mockedClass).expectedBehavior()}
+ * </pre>
+ */
+fun <T> verifyOnce(mock: T): T =
+    Mockito.verify(mock, times(1))
+
+/**
+ * Use this method to verify a certain behavior happened at least one time.
+ *
+ * @param mock the mocked class.
+ * <pre>{@code
+ * verifyAtLeastOnce(mockedClass).expectedBehavior()}
+ * </pre>
+ */
+fun <T> verifyAtLeastOnce(mock: T): T =
+    Mockito.verify(mock, atLeastOnce())
+
+/**
+ * Use this method to verify a certain behavior did not happen at all.
+ *
+ * @param mock the mocked class.
+ * <pre>{@code
+ * verifyZeroTimes(mockedClass).unexpectedBehavior()}
+ * </pre>
+ */
+fun <T> verifyZeroTimes(mock: T): T =
+    Mockito.verify(mock, times(0))
+
+/**
+ * Use this method to verify a certain behavior happened a custom number of times.
+ *
+ * @param mock the mocked class.
+ * <pre>{@code
+ * verifyCustomTimes(mockedClass, 3).expectedBehavior()}
+ * </pre>
+ */
+fun <T> verifyCustomTimes(mock: T, times: Int) =
+    Mockito.verify(mock, times(times))