1 files changed, 84 insertions, 0 deletions

diff --git a/mockito-kotlin/src/main/kotlin/org/mockito/kotlin/KStubbing.kt b/mockito-kotlin/src/main/kotlin/org/mockito/kotlin/KStubbing.kt
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+++ b/mockito-kotlin/src/main/kotlin/org/mockito/kotlin/KStubbing.kt
@@ -0,0 +1,84 @@
+/*
+ * 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.kotlin.internal.createInstance
+import kotlinx.coroutines.runBlocking
+import org.mockito.Mockito
+import org.mockito.stubbing.OngoingStubbing
+import kotlin.reflect.KClass
+
+
+inline fun <T> stubbing(
+    mock: T,
+    stubbing: KStubbing<T>.(T) -> Unit
+) {
+    KStubbing(mock).stubbing(mock)
+}
+
+inline fun <T : Any> T.stub(stubbing: KStubbing<T>.(T) -> Unit): T {
+    return apply { KStubbing(this).stubbing(this) }
+}
+
+class KStubbing<out T>(val mock: T) {
+
+    fun <R> on(methodCall: R): OngoingStubbing<R> = Mockito.`when`(methodCall)
+
+    fun <R : Any> onGeneric(methodCall: T.() -> R?, c: KClass<R>): OngoingStubbing<R> {
+        val r = try {
+            mock.methodCall()
+        } catch (e: NullPointerException) {
+            // An NPE may be thrown by the Kotlin type system when the MockMethodInterceptor returns a
+            // null value for a non-nullable generic type.
+            // We catch this NPE to return a valid instance.
+            // The Mockito state has already been modified at this point to reflect
+            // the wanted changes.
+            createInstance(c)
+        }
+        return Mockito.`when`(r)
+    }
+
+    inline fun <reified R : Any> onGeneric(noinline methodCall: T.() -> R?): OngoingStubbing<R> {
+        return onGeneric(methodCall, R::class)
+    }
+
+    fun <R> on(methodCall: T.() -> R): OngoingStubbing<R> {
+        return try {
+            Mockito.`when`(mock.methodCall())
+        } catch (e: NullPointerException) {
+            throw MockitoKotlinException(
+                  "NullPointerException thrown when stubbing.\nThis may be due to two reasons:\n\t- The method you're trying to stub threw an NPE: look at the stack trace below;\n\t- You're trying to stub a generic method: try `onGeneric` instead.",
+                  e
+            )
+        }
+    }
+
+    fun <T : Any, R> KStubbing<T>.onBlocking(
+        m: suspend T.() -> R
+    ): OngoingStubbing<R> {
+        return runBlocking { Mockito.`when`(mock.m()) }
+    }
+}
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