[TEST] Extract compiler-specific test utils from :tests-common to new module

compiler/test-infrastructure-utils/tests/org/jetbrains/kotlin/test/Assertions.kt

@@ -7,6 +7,9 @@
 
 package org.jetbrains.kotlin.test
 
+import java.io.File
+import java.util.*
+import kotlin.collections.ArrayList
 import kotlin.contracts.ExperimentalContracts
 import kotlin.contracts.contract
 
@@ -34,3 +37,45 @@ internal fun assertTrue(message: String, value: Boolean) {
         fail(message)
     }
 }
+
+abstract class Assertions {
+    fun assertEqualsToFile(expectedFile: File, actual: String, sanitizer: (String) -> String = { it }) {
+        assertEqualsToFile(expectedFile, actual, sanitizer) { "Actual data differs from file content" }
+    }
+
+    abstract fun assertEqualsToFile(
+        expectedFile: File,
+        actual: String,
+        sanitizer: (String) -> String = { it },
+        message: (() -> String)
+    )
+
+    abstract fun assertEquals(expected: Any?, actual: Any?, message: (() -> String)? = null)
+    abstract fun assertNotEquals(expected: Any?, actual: Any?, message: (() -> String)? = null)
+    abstract fun assertTrue(value: Boolean, message: (() -> String)? = null)
+    abstract fun assertFalse(value: Boolean, message: (() -> String)? = null)
+    abstract fun assertNotNull(value: Any?, message: (() -> String)? = null)
+    abstract fun <T> assertSameElements(expected: Collection<T>, actual: Collection<T>, message: (() -> String)?)
+
+    fun <T> assertContainsElements(collection: Collection<T>, vararg expected: T) {
+        assertContainsElements(collection, expected.toList())
+    }
+
+    fun <T> assertContainsElements(collection: Collection<T>, expected: Collection<T>) {
+        val copy = ArrayList(collection)
+        copy.retainAll(expected)
+        assertSameElements(copy, expected) { renderCollectionToString(collection) }
+    }
+
+    fun renderCollectionToString(collection: Iterable<*>): String {
+        if (!collection.iterator().hasNext()) {
+            return "<empty>"
+        }
+
+        return collection.joinToString("\n")
+    }
+
+    abstract fun assertAll(exceptions: List<AssertionError>)
+
+    abstract fun fail(message: () -> String): Nothing
+}