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diff --git a/mockito-kotlin/src/main/kotlin/org/mockito/kotlin/Matchers.kt b/mockito-kotlin/src/main/kotlin/org/mockito/kotlin/Matchers.kt
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+/*
+ * 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 org.mockito.ArgumentMatcher
+import org.mockito.Mockito
+
+/** Object argument that is equal to the given value. */
+fun <T> eq(value: T): T {
+    return Mockito.eq(value) ?: value
+}
+
+/**  Object argument that is the same as the given value. */
+fun <T> same(value: T): T {
+    return Mockito.same(value) ?: value
+}
+
+/** Matches any object, excluding nulls. */
+inline fun <reified T : Any> any(): T {
+    return Mockito.any(T::class.java) ?: createInstance()
+}
+
+/** Matches anything, including nulls. */
+inline fun <reified T : Any> anyOrNull(): T {
+    return Mockito.any<T>() ?: createInstance()
+}
+
+/** Matches any vararg object, including nulls. */
+inline fun <reified T : Any> anyVararg(): T {
+    return Mockito.any<T>() ?: createInstance()
+}
+
+/** Matches any array of type T. */
+inline fun <reified T : Any?> anyArray(): Array<T> {
+    return Mockito.any(Array<T>::class.java) ?: arrayOf()
+}
+
+/**
+ * Creates a custom argument matcher.
+ * `null` values will never evaluate to `true`.
+ *
+ * @param predicate An extension function on [T] that returns `true` when a [T] matches the predicate.
+ */
+inline fun <reified T : Any> argThat(noinline predicate: T.() -> Boolean): T {
+    return Mockito.argThat { arg: T? -> arg?.predicate() ?: false } ?: createInstance(
+          T::class
+    )
+}
+
+/**
+ * Registers a custom ArgumentMatcher. The original Mockito function registers the matcher and returns null,
+ * here the required type is returned.
+ *
+ * @param matcher The ArgumentMatcher on [T] to be registered.
+ */
+inline fun <reified T : Any> argThat(matcher: ArgumentMatcher<T>): T {
+    return Mockito.argThat(matcher) ?: createInstance()
+}
+
+/**
+ * Alias for [argThat].
+ *
+ * Creates a custom argument matcher.
+ * `null` values will never evaluate to `true`.
+ *
+ * @param predicate An extension function on [T] that returns `true` when a [T] matches the predicate.
+ */
+inline fun <reified T : Any> argForWhich(noinline predicate: T.() -> Boolean): T {
+    return argThat(predicate)
+}
+
+/**
+ * Creates a custom argument matcher.
+ * `null` values will never evaluate to `true`.
+ *
+ * @param predicate A function that returns `true` when given [T] matches the predicate.
+ */
+inline fun <reified T : Any> argWhere(noinline predicate: (T) -> Boolean): T {
+    return argThat(predicate)
+}
+
+/**
+ * Argument that implements the given class.
+ */
+inline fun <reified T : Any> isA(): T {
+    return Mockito.isA(T::class.java) ?: createInstance()
+}
+
+/**
+ * `null` argument.
+ */
+fun <T : Any> isNull(): T? = Mockito.isNull()
+
+/**
+ * Not `null` argument.
+ */
+fun <T : Any> isNotNull(): T? {
+    return Mockito.isNotNull()
+}
+
+/**
+ * Not `null` argument.
+ */
+fun <T : Any> notNull(): T? {
+    return Mockito.notNull()
+}
+
+/**
+ * Object argument that is reflection-equal to the given value with support for excluding
+ * selected fields from a class.
+ */
+inline fun <reified T : Any> refEq(value: T, vararg excludeFields: String): T {
+    return Mockito.refEq<T>(value, *excludeFields) ?: createInstance()
+}
+