Create from usage: Added tests.

idea/testData/quickfix/createFromUsage/component/afterCreateComponentFromUsage1.kt

@@ -0,0 +1,11 @@
+// "Create method 'component3' from usage" "true"
+class Foo<T> {
+    fun component1(): Int { return 0 }
+    fun component2(): Int { return 0 }
+    fun component3(): Any {
+        throw Exception("not implemented") //To change body of created methods use File | Settings | File Templates.
+    }
+}
+fun foo() {
+    val (a, b, c) = Foo<Int>()
+}

idea/testData/quickfix/createFromUsage/component/afterCreateComponentFromUsage2.kt

@@ -0,0 +1,11 @@
+// "Create method 'component3' from usage" "true"
+class Foo<T> {
+    fun component1(): Int { return 0 }
+    fun component2(): Int { return 0 }
+    fun component3(): String {
+        throw Exception("not implemented") //To change body of created methods use File | Settings | File Templates.
+    }
+}
+fun foo() {
+    val (a, b, c: String) = Foo<Int>()
+}

idea/testData/quickfix/createFromUsage/component/beforeCreateComponentFromUsage1.kt

@@ -0,0 +1,8 @@
+// "Create method 'component3' from usage" "true"
+class Foo<T> {
+    fun component1(): Int { return 0 }
+    fun component2(): Int { return 0 }
+}
+fun foo() {
+    val (a, b, c) = Foo<caret><Int>()
+}

idea/testData/quickfix/createFromUsage/component/beforeCreateComponentFromUsage2.kt

@@ -0,0 +1,8 @@
+// "Create method 'component3' from usage" "true"
+class Foo<T> {
+    fun component1(): Int { return 0 }
+    fun component2(): Int { return 0 }
+}
+fun foo() {
+    val (a, b, c: String) = Foo<caret><Int>()
+}