diff --git a/plugins/completion-ml-ranking/test/com/intellij/completion/ml/sorting/IgnoredItemsTest.kt b/plugins/completion-ml-ranking/test/com/intellij/completion/ml/sorting/IgnoredItemsTest.kt
new file mode 100644
index 000000000000..da1b8bd95232
--- /dev/null
+++ b/plugins/completion-ml-ranking/test/com/intellij/completion/ml/sorting/IgnoredItemsTest.kt
@@ -0,0 +1,105 @@
+package com.intellij.completion.ml.sorting
+
+import com.intellij.codeInsight.completion.*
+import com.intellij.codeInsight.completion.ml.MLRankingIgnorable
+import com.intellij.codeInsight.lookup.LookupElement
+import com.intellij.codeInsight.lookup.LookupElementDecorator
+import com.intellij.completion.ml.tracker.setupCompletionContext
+import com.intellij.lang.java.JavaLanguage
+import com.intellij.openapi.extensions.DefaultPluginDescriptor
+import com.intellij.openapi.extensions.LoadingOrder
+import junit.framework.TestCase
+
+class IgnoredItemsTest : MLSortingTestCase() {
+  private lateinit var defaultOrdering: List<String>
+
+  override fun setUp() {
+    super.setUp()
+    setUpContributor()
+    setupCompletionContext(myFixture)
+    defaultOrdering = invokeCompletion()
+  }
+
+  private fun setUpContributor() {
+    val completionContributor = CompletionContributorEP(
+      JavaLanguage.INSTANCE.id,
+      WrappingContributor::class.java.name,
+      DefaultPluginDescriptor("registerCompletionContributor")
+    )
+    CompletionContributor.EP.point.registerExtension(completionContributor, LoadingOrder.FIRST, testRootDisposable)
+  }
+
+  override fun customizeSettings(settings: MLRankingSettingsState): MLRankingSettingsState = settings.withRankingEnabled(true)
+
+  fun `test ml changes the order`() {
+    TestCase.assertTrue("Test is broken, please update test data to ensure that completion provides at least 4 elements",
+                        defaultOrdering.size > 3)
+    val reordered = orderingWithIgnored(emptyList())
+    TestCase.assertFalse(defaultOrdering == reordered)
+  }
+
+  fun `test ignore all`() {
+    val reordered = orderingWithIgnored(defaultOrdering)
+    TestCase.assertEquals(defaultOrdering, reordered)
+  }
+
+  fun `test delegating items ignored`() {
+    WrappingContributor.NESTED_WRAPPING = true
+    val reordered = orderingWithIgnored(emptyList())
+    TestCase.assertFalse(defaultOrdering.equals(reordered))
+    WrappingContributor.NESTED_WRAPPING = false
+  }
+
+  fun `test ignore top items`() {
+    val topItemsCount = 3
+    val reordered = orderingWithIgnored(defaultOrdering.take(topItemsCount))
+    TestCase.assertEquals(defaultOrdering.take(topItemsCount), reordered.take(topItemsCount))
+    TestCase.assertFalse(defaultOrdering[topItemsCount] == reordered[topItemsCount])
+  }
+
+  private fun invokeCompletion(): List<String> {
+    complete()
+    val result = myItems.map { it.lookupString }
+    lookup.hide()
+
+    return result
+  }
+
+  private fun orderingWithIgnored(ignored: List<String>): List<String> {
+    withRanker(Ranker.Inverse)
+    WrappingContributor.ITEMS_TO_IGNORE = ignored
+    val result = invokeCompletion()
+    WrappingContributor.ITEMS_TO_IGNORE = emptyList()
+    withRanker(Ranker.Default)
+    return result
+  }
+
+  private class WrappingContributor : CompletionContributor() {
+    override fun fillCompletionVariants(parameters: CompletionParameters, result: CompletionResultSet) {
+      result.runRemainingContributors(parameters) {
+        val lookupElement = it.lookupElement
+        if (lookupElement.lookupString in ITEMS_TO_IGNORE) {
+          result.passResult(it.withLookupElement(makeIgnored(lookupElement)))
+        }
+        else {
+          result.passResult(it)
+        }
+
+      }
+    }
+
+    private fun makeIgnored(element: LookupElement): LookupElement {
+      val ignored = MLRankingIgnorable.wrap(element)
+      if (!NESTED_WRAPPING) {
+        return ignored
+      }
+
+      return object : LookupElementDecorator<LookupElement>(element) {}
+    }
+
+    companion object {
+      var ITEMS_TO_IGNORE: List<String> = emptyList()
+      var NESTED_WRAPPING = false
+    }
+  }
+}
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