diff --git a/plugins/coverage/testSrc/com/intellij/coverage/CoverageIntegrationBaseTest.kt b/plugins/coverage/testSrc/com/intellij/coverage/CoverageIntegrationBaseTest.kt
index 3695e0608074..f0665f3feeeb 100644
--- a/plugins/coverage/testSrc/com/intellij/coverage/CoverageIntegrationBaseTest.kt
+++ b/plugins/coverage/testSrc/com/intellij/coverage/CoverageIntegrationBaseTest.kt
@@ -92,6 +92,11 @@ abstract class CoverageIntegrationBaseTest : JavaModuleTestCase() {
     return loadIJSuite(path = ijSuiteFile.absolutePath)
   }
 
+  protected fun assertNoSuites() {
+    Assert.assertNull(manager.currentSuitesBundle)
+    Assert.assertEquals(0, manager.suites.size)
+  }
+
   companion object {
     protected fun getTestDataPath() = PluginPathManager.getPluginHomePath("coverage") + "/testData/simple"
 
diff --git a/plugins/coverage/testSrc/com/intellij/coverage/CoverageSuitesTest.kt b/plugins/coverage/testSrc/com/intellij/coverage/CoverageSuitesTest.kt
index ab0555f79aff..7abbd0fd4836 100644
--- a/plugins/coverage/testSrc/com/intellij/coverage/CoverageSuitesTest.kt
+++ b/plugins/coverage/testSrc/com/intellij/coverage/CoverageSuitesTest.kt
@@ -173,8 +173,4 @@ class CoverageSuitesTest : CoverageIntegrationBaseTest() {
     manager.addCoverageSuite(suite, suite.presentableName)
   }
 
-  private fun assertNoSuites() {
-    Assert.assertNull(manager.currentSuitesBundle)
-    Assert.assertTrue(manager.suites.isEmpty())
-  }
 }
\ No newline at end of file
diff --git a/plugins/coverage/testSrc/com/intellij/coverage/ExternalCoverageTest.kt b/plugins/coverage/testSrc/com/intellij/coverage/ExternalCoverageTest.kt
index 0b34b092f595..392a6146b170 100644
--- a/plugins/coverage/testSrc/com/intellij/coverage/ExternalCoverageTest.kt
+++ b/plugins/coverage/testSrc/com/intellij/coverage/ExternalCoverageTest.kt
@@ -11,7 +11,8 @@ import java.io.File
 
 class ExternalCoverageTest : CoverageIntegrationBaseTest() {
   fun `test watching externally added coverage`(): Unit = runBlocking {
-    val  ijSuite = loadIJSuiteCopy()
+    assertNoSuites()
+    val ijSuite = loadIJSuiteCopy()
     val ijSuiteFile = File(ijSuite.suites[0].coverageDataFileProvider.coverageDataFilePath)
 
     openSuiteAndWait(ijSuite)
@@ -34,5 +35,8 @@ class ExternalCoverageTest : CoverageIntegrationBaseTest() {
     val classData = projectData.getClassData("foo.bar.BarClass")
     val lineData = classData.getLineData(9)
     Assert.assertEquals(LineCoverage.FULL, lineData.status.toByte())
+
+    closeSuite(ijSuite)
+    assertNoSuites()
   }
 }
diff --git a/plugins/coverage/testSrc/com/intellij/coverage/actions/SuiteChooserTest.kt b/plugins/coverage/testSrc/com/intellij/coverage/actions/SuiteChooserTest.kt
index d2cfed02d310..077deeb3a987 100644
--- a/plugins/coverage/testSrc/com/intellij/coverage/actions/SuiteChooserTest.kt
+++ b/plugins/coverage/testSrc/com/intellij/coverage/actions/SuiteChooserTest.kt
@@ -16,6 +16,8 @@ import org.junit.Assert
 class SuiteChooserTest : CoverageIntegrationBaseTest() {
 
   fun `test chooser dialog includes registered suites`(): Unit = runBlocking {
+    assertNoSuites()
+
     val ijSuite = loadIJSuite().suites[0]
     val jacocoSuite = loadJaCoCoSuite().suites[0]
     val xmlSuite = loadXMLSuite().suites[0]
@@ -35,9 +37,14 @@ class SuiteChooserTest : CoverageIntegrationBaseTest() {
     Assert.assertFalse(suites[xmlSuite]!!)
 
     closeDialog(dialog)
+    unregisterCoverageSuite(ijSuite)
+    unregisterCoverageSuite(xmlSuite)
+    unregisterCoverageSuite(jacocoSuite)
+    assertNoSuites()
   }
 
   fun `test chooser dialog includes opened suites selected`(): Unit = runBlocking {
+    assertNoSuites()
     val ijBundle = loadIJSuite()
     val ijSuite = ijBundle.suites[0]
     registerSuite(ijSuite)
@@ -58,9 +65,13 @@ class SuiteChooserTest : CoverageIntegrationBaseTest() {
 
     closeSuite(ijBundle)
     closeDialog(dialog)
+    unregisterCoverageSuite(ijSuite)
+    unregisterCoverageSuite(xmlSuite)
+    assertNoSuites()
   }
 
   fun `test suite chooser opens checked suite`(): Unit = runBlocking {
+    assertNoSuites()
     val ijSuite = loadIJSuite().suites[0]
     registerSuite(ijSuite)
 
@@ -78,9 +89,12 @@ class SuiteChooserTest : CoverageIntegrationBaseTest() {
     Assert.assertTrue(ijSuite in currentBundle.suites)
 
     closeDialog(dialog)
+    unregisterCoverageSuite(ijSuite)
+    assertNoSuites()
   }
 
   fun `test suite chooser opens all checked suites`(): Unit = runBlocking {
+    assertNoSuites()
     val ijSuite = loadIJSuite().suites[0]
     registerSuite(ijSuite)
 
@@ -110,9 +124,13 @@ class SuiteChooserTest : CoverageIntegrationBaseTest() {
     }
 
     closeDialog(dialog)
+    unregisterCoverageSuite(ijSuite)
+    unregisterCoverageSuite(xmlSuite)
+    assertNoSuites()
   }
 
   fun `test chooser dialog closes suites if not selected`(): Unit = runBlocking {
+    assertNoSuites()
     val ijBundle = loadIJSuite()
     val ijSuite = ijBundle.suites[0]
     registerSuite(ijSuite)
@@ -130,9 +148,12 @@ class SuiteChooserTest : CoverageIntegrationBaseTest() {
     Assert.assertTrue(bundles.isEmpty())
 
     closeDialog(dialog)
+    unregisterCoverageSuite(ijSuite)
+    assertNoSuites()
   }
 
   fun `test no coverage action closes all opened suites`(): Unit = runBlocking {
+    assertNoSuites()
     val ijBundle = loadIJSuite()
     val ijSuite = ijBundle.suites[0]
     registerSuite(ijSuite)
@@ -146,7 +167,8 @@ class SuiteChooserTest : CoverageIntegrationBaseTest() {
       closeDialog(dialog)
     }
 
-    Assert.assertTrue(manager.activeSuites().isEmpty())
+    unregisterCoverageSuite(ijSuite)
+    assertNoSuites()
   }
 
   private suspend fun openChooserDialog(): CoverageSuiteChooserDialog =
@@ -173,4 +195,6 @@ class SuiteChooserTest : CoverageIntegrationBaseTest() {
     // Use 'presentableName' parameter to avoid report file deletion
     manager.addCoverageSuite(suite, suite.presentableName)
   }
+
+  private fun unregisterCoverageSuite(suite: CoverageSuite) = manager.unregisterCoverageSuite(suite)
 }