Add interface to verify execution order of suspending functions (#464)

mockito-kotlin/src/main/kotlin/org/mockito/kotlin/KInOrder.kt

@@ -0,0 +1,47 @@
+/*
+ * The MIT License
+ *
+ * Copyright (c) 2018 Niek Haarman
+ * Copyright (c) 2007 Mockito contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+package org.mockito.kotlin
+
+import org.mockito.InOrder
+import org.mockito.verification.VerificationMode
+
+interface KInOrder: InOrder {
+    /**
+     * Verifies certain suspending behavior <b>happened once</b> in order.
+     *
+     * Warning: Only one method call can be verified in the function.
+     * Subsequent method calls are ignored!
+     */
+    fun <T> verifyBlocking(mock: T, f: suspend T.() -> Unit)
+
+    /**
+     * Verifies certain suspending behavior happened at least once / exact number of times / never in order.
+     *
+     * Warning: Only one method call can be verified in the function.
+     * Subsequent method calls are ignored!
+     */
+    fun <T> verifyBlocking(mock: T, mode: VerificationMode, f: suspend T.() -> Unit)
+}

mockito-kotlin/src/main/kotlin/org/mockito/kotlin/Verification.kt

@@ -29,6 +29,7 @@ import org.mockito.kotlin.internal.createInstance
 import kotlinx.coroutines.runBlocking
 import org.mockito.InOrder
 import org.mockito.Mockito
+import org.mockito.kotlin.internal.KInOrderDecorator
 import org.mockito.verification.VerificationAfterDelay
 import org.mockito.verification.VerificationMode
 import org.mockito.verification.VerificationWithTimeout
@@ -188,42 +189,67 @@ fun ignoreStubs(vararg mocks: Any): Array<out Any> {
 }
 
 /**
- * Creates [InOrder] object that allows verifying mocks in order.
+ * Creates [KInOrder] object that allows verifying mocks in order.
  *
- * Alias for [Mockito.inOrder].
+ * Wrapper for [Mockito.inOrder] that also allows to verify suspending method calls.
  */
-fun inOrder(vararg mocks: Any): InOrder {
-    return Mockito.inOrder(*mocks)!!
+fun inOrder(vararg mocks: Any): KInOrder {
+    return KInOrderDecorator(Mockito.inOrder(*mocks)!!)
 }
 
 /**
- * Creates [InOrder] object that allows verifying mocks in order.
+ * Creates [KInOrder] object that allows verifying mocks in order.
  * Accepts a lambda to allow easy evaluation.
  *
- * Alias for [Mockito.inOrder].
+ * Wrapper for [Mockito.inOrder] that also allows to verify suspending method calls.
  */
 inline fun inOrder(
     vararg mocks: Any,
-    evaluation: InOrder.() -> Unit
+    evaluation: KInOrder.() -> Unit
 ) {
-    Mockito.inOrder(*mocks).evaluation()
+    KInOrderDecorator(Mockito.inOrder(*mocks)).evaluation()
 }
 
 /**
- * Allows [InOrder] verification for a single mocked instance:
+ * Allows [KInOrder] verification for a single mocked instance:
  *
  * mock.inOrder {
  *    verify().foo()
+ *    verifyBlocking { bar() }
  * }
  *
  */
 inline fun <T> T.inOrder(block: InOrderOnType<T>.() -> Any) {
     block.invoke(InOrderOnType(this))
 }
 
-class InOrderOnType<T>(private val t: T) : InOrder by inOrder(t as Any) {
+class InOrderOnType<T>(private val t: T) : KInOrder by inOrder(t as Any) {
 
+    /**
+     * Verifies certain behavior <b>happened once</b> in order.
+     */
     fun verify(): T = verify(t)
+
+    /**
+     * Verifies certain behavior happened at least once / exact number of times / never in order.
+     */
+    fun verify(mode: VerificationMode): T = verify(t, mode)
+
+    /**
+     * Verifies certain suspending behavior <b>happened once</b> in order.
+     *
+     * Warning: Only one method call can be verified in the function.
+     * Subsequent method calls are ignored!
+     */
+    fun verifyBlocking(f: suspend T.() -> Unit) = verifyBlocking(t, f)
+
+    /**
+     * Verifies certain suspending behavior happened at least once / exact number of times / never in order.
+     *
+     * Warning: Only one method call can be verified in the function.
+     * Subsequent method calls are ignored!
+     */
+    fun verifyBlocking(mode: VerificationMode, f: suspend T.() -> Unit) = verifyBlocking(t, mode, f)
 }
 
 /**

mockito-kotlin/src/main/kotlin/org/mockito/kotlin/internal/KInOrderDecorator.kt

@@ -0,0 +1,43 @@
+/*
+ * The MIT License
+ *
+ * Copyright (c) 2018 Niek Haarman
+ * Copyright (c) 2007 Mockito contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+package org.mockito.kotlin.internal
+
+import kotlinx.coroutines.runBlocking
+import org.mockito.InOrder
+import org.mockito.kotlin.KInOrder
+import org.mockito.verification.VerificationMode
+
+class KInOrderDecorator(private val inOrder: InOrder) : KInOrder, InOrder by inOrder {
+    override fun <T> verifyBlocking(mock: T, f: suspend T.() -> Unit) {
+        val m = verify(mock)
+        runBlocking { m.f() }
+    }
+
+    override fun <T> verifyBlocking(mock: T, mode: VerificationMode, f: suspend T.() -> Unit) {
+        val m = verify(mock, mode)
+        runBlocking { m.f() }
+    }
+}

mockito-kotlin/src/test/kotlin/test/CoroutinesTest.kt

@@ -10,7 +10,9 @@ import kotlinx.coroutines.withContext
 import kotlinx.coroutines.*
 import kotlinx.coroutines.channels.actor
 import org.junit.Assert.assertEquals
+import org.junit.Assert.assertThrows
 import org.junit.Test
+import org.mockito.InOrder
 import org.mockito.kotlin.*
 import java.util.*
 
@@ -255,6 +257,134 @@ class CoroutinesTest {
             assertEquals(5, asyncTask.await())
         }
     }
+
+    @Test
+    fun inOrderRemainsCompatible() {
+        /* Given */
+        val fixture: SomeInterface = mock()
+
+        /* When */
+        val inOrder = inOrder(fixture)
+
+        /* Then */
+        expect(inOrder).toBeInstanceOf<InOrder>()
+    }
+
+    @Test
+    fun inOrderSuspendingCalls() {
+        /* Given */
+        val fixtureOne: SomeInterface = mock()
+        val fixtureTwo: SomeInterface = mock()
+
+        /* When */
+        runBlocking {
+            fixtureOne.suspending()
+            fixtureTwo.suspending()
+        }
+
+        /* Then */
+        val inOrder = inOrder(fixtureOne, fixtureTwo)
+        inOrder.verifyBlocking(fixtureOne) { suspending() }
+        inOrder.verifyBlocking(fixtureTwo) { suspending() }
+    }
+
+    @Test
+    fun inOrderSuspendingCallsFailure() {
+        /* Given */
+        val fixtureOne: SomeInterface = mock()
+        val fixtureTwo: SomeInterface = mock()
+
+        /* When */
+        runBlocking {
+            fixtureOne.suspending()
+            fixtureTwo.suspending()
+        }
+
+        /* Then */
+        val inOrder = inOrder(fixtureOne, fixtureTwo)
+        inOrder.verifyBlocking(fixtureTwo) { suspending() }
+        assertThrows(AssertionError::class.java) {
+            inOrder.verifyBlocking(fixtureOne) { suspending() }
+        }
+    }
+
+    @Test
+    fun inOrderBlockSuspendingCalls() {
+        /* Given */
+        val fixtureOne: SomeInterface = mock()
+        val fixtureTwo: SomeInterface = mock()
+
+        /* When */
+        runBlocking {
+            fixtureOne.suspending()
+            fixtureTwo.suspending()
+        }
+
+        /* Then */
+        inOrder(fixtureOne, fixtureTwo) {
+            verifyBlocking(fixtureOne) { suspending() }
+            verifyBlocking(fixtureTwo) { suspending() }
+        }
+    }
+
+    @Test
+    fun inOrderBlockSuspendingCallsFailure() {
+        /* Given */
+        val fixtureOne: SomeInterface = mock()
+        val fixtureTwo: SomeInterface = mock()
+
+        /* When */
+        runBlocking {
+            fixtureOne.suspending()
+            fixtureTwo.suspending()
+        }
+
+        /* Then */
+        inOrder(fixtureOne, fixtureTwo) {
+            verifyBlocking(fixtureTwo) { suspending() }
+            assertThrows(AssertionError::class.java) {
+                verifyBlocking(fixtureOne) { suspending() }
+            }
+        }
+    }
+
+    @Test
+    fun inOrderOnObjectSuspendingCalls() {
+        /* Given */
+        val fixture: SomeInterface = mock()
+
+        /* When */
+        runBlocking {
+            fixture.suspendingWithArg(1)
+            fixture.suspendingWithArg(2)
+        }
+
+        /* Then */
+        fixture.inOrder {
+            verifyBlocking { suspendingWithArg(1) }
+            verifyBlocking { suspendingWithArg(2) }
+        }
+    }
+
+    @Test
+    fun inOrderOnObjectSuspendingCallsFailure() {
+        /* Given */
+        val fixture: SomeInterface = mock()
+
+        /* When */
+        runBlocking {
+            fixture.suspendingWithArg(1)
+            fixture.suspendingWithArg(2)
+        }
+
+        /* Then */
+        fixture.inOrder {
+            verifyBlocking { suspendingWithArg(2) }
+            assertThrows(AssertionError::class.java) {
+                verifyBlocking { suspendingWithArg(1) }
+            }
+        }
+    }
 }
 
 interface SomeInterface {