Do not mark kotlin.test.Test annotated declarations as unused

So #KT-20523 Fixed

idea/testData/multiFileLocalInspections/unusedSymbol/fromKotlinTest/after/kotlin/test/KotlinTest.kt

@@ -0,0 +1,6 @@
+package kotlin.test
+
+annotation class Test
+
+fun assertEquals(expected: Any, actual: Any) {}
+

idea/testData/multiFileLocalInspections/unusedSymbol/fromKotlinTest/after/test.kt

@@ -0,0 +1,10 @@
+import kotlin.test.Test
+import kotlin.test.assertEquals
+
+class SomeTest {
+
+    @Test
+    fun testSomething() {
+        assertEquals(4, 2 + 2)
+    }
+}

idea/testData/multiFileLocalInspections/unusedSymbol/fromKotlinTest/before/kotlin/test/KotlinTest.kt

@@ -0,0 +1,6 @@
+package kotlin.test
+
+annotation class Test
+
+fun assertEquals(expected: Any, actual: Any) {}
+

idea/testData/multiFileLocalInspections/unusedSymbol/fromKotlinTest/before/test.kt

@@ -0,0 +1,10 @@
+import kotlin.test.Test
+import kotlin.test.assertEquals
+
+class SomeTest {
+
+    @Test
+    fun <caret>testSomething() {
+        assertEquals(4, 2 + 2)
+    }
+}

idea/testData/multiFileLocalInspections/unusedSymbol/fromKotlinTest/fromKotlinTest.test

@@ -0,0 +1,5 @@
+{
+    "inspectionClass": "org.jetbrains.kotlin.idea.inspections.UnusedSymbolInspection",
+    "problem": "none",
+    "mainFile": "test.kt"
+}

idea/testData/multiFileLocalInspections/unusedSymbol/fromKotlinTestClass/after/kotlin/test/KotlinTest.kt

@@ -0,0 +1,6 @@
+package kotlin.test
+
+annotation class Test
+
+fun assertEquals(expected: Any, actual: Any) {}
+

idea/testData/multiFileLocalInspections/unusedSymbol/fromKotlinTestClass/after/test.kt

@@ -0,0 +1,10 @@
+import kotlin.test.Test
+import kotlin.test.assertEquals
+
+class SomeTest {
+
+    @Test
+    fun testSomething() {
+        assertEquals(4, 2 + 2)
+    }
+}

idea/testData/multiFileLocalInspections/unusedSymbol/fromKotlinTestClass/before/kotlin/test/KotlinTest.kt

@@ -0,0 +1,6 @@
+package kotlin.test
+
+annotation class Test
+
+fun assertEquals(expected: Any, actual: Any) {}
+

idea/testData/multiFileLocalInspections/unusedSymbol/fromKotlinTestClass/before/test.kt

@@ -0,0 +1,10 @@
+import kotlin.test.Test
+import kotlin.test.assertEquals
+
+class <caret>SomeTest {
+
+    @Test
+    fun testSomething() {
+        assertEquals(4, 2 + 2)
+    }
+}

idea/testData/multiFileLocalInspections/unusedSymbol/fromKotlinTestClass/fromKotlinTestClass.test

@@ -0,0 +1,5 @@
+{
+    "inspectionClass": "org.jetbrains.kotlin.idea.inspections.UnusedSymbolInspection",
+    "problem": "none",
+    "mainFile": "test.kt"
+}