diff --git a/python/services/system-python/intellij.python.community.services.systemPython.iml b/python/services/system-python/intellij.python.community.services.systemPython.iml
index a665ee86be8d..c401fd5a7327 100644
--- a/python/services/system-python/intellij.python.community.services.systemPython.iml
+++ b/python/services/system-python/intellij.python.community.services.systemPython.iml
@@ -31,8 +31,6 @@
     <orderEntry type="module" module-name="intellij.python.community.impl.installer" />
     <orderEntry type="module" module-name="intellij.python.community.impl.venv" />
     <orderEntry type="module" module-name="intellij.python.community.testFramework.testEnv" scope="TEST" />
-    <orderEntry type="library" scope="TEST" name="io.mockk" level="project" />
-    <orderEntry type="library" scope="TEST" name="io.mockk.jvm" level="project" />
     <orderEntry type="module" module-name="intellij.platform.testFramework" scope="TEST" />
     <orderEntry type="module" module-name="intellij.python.psi.impl" />
   </component>
diff --git a/python/services/system-python/testResources/META-INF/plugin.xml b/python/services/system-python/testResources/META-INF/plugin.xml
index 02f5860da78e..e96a300b6bff 100644
--- a/python/services/system-python/testResources/META-INF/plugin.xml
+++ b/python/services/system-python/testResources/META-INF/plugin.xml
@@ -1,5 +1,4 @@
 <idea-plugin>
-
   <id>pycharm.systemPython.tests</id>
   <dependencies>
     <plugin id="com.intellij.modules.python"/>
diff --git a/python/services/system-python/testResources/intellij.python.community.services.systemPython._test.xml b/python/services/system-python/testResources/intellij.python.community.services.systemPython._test.xml
index e49a89f5a534..db259d0ef34a 100644
--- a/python/services/system-python/testResources/intellij.python.community.services.systemPython._test.xml
+++ b/python/services/system-python/testResources/intellij.python.community.services.systemPython._test.xml
@@ -4,4 +4,11 @@
     <module name="intellij.python.community.junit5Tests.framework._test"/>
     <module name="intellij.python.community.services.systemPython"/>
   </dependencies>
+
+  <extensions defaultExtensionNs="com.intellij">
+    <applicationInitializedListener implementation="com.intellij.python.junit5Tests.env.systemPython.SystemPythonRootsFixer"/>
+  </extensions>
+  <extensions defaultExtensionNs="Pythonid">
+    <systemPythonProvider implementation="com.intellij.python.junit5Tests.env.systemPython.impl.EnvTestPythonProvider"/>
+  </extensions>
 </idea-plugin>
\ No newline at end of file
diff --git a/python/services/system-python/tests/com/intellij/python/junit5Tests/env/systemPython/SystemPythonServiceShowCaseTest.kt b/python/services/system-python/tests/com/intellij/python/junit5Tests/env/systemPython/SystemPythonServiceShowCaseTest.kt
index fa6b77838be8..a7a9f080bd59 100644
--- a/python/services/system-python/tests/com/intellij/python/junit5Tests/env/systemPython/SystemPythonServiceShowCaseTest.kt
+++ b/python/services/system-python/tests/com/intellij/python/junit5Tests/env/systemPython/SystemPythonServiceShowCaseTest.kt
@@ -28,9 +28,6 @@ import com.jetbrains.python.errorProcessing.MessageError
 import com.jetbrains.python.getOrThrow
 import com.jetbrains.python.sdk.flavors.PythonSdkFlavor
 import com.jetbrains.python.venvReader.VirtualEnvReader
-import io.mockk.coEvery
-import io.mockk.coVerify
-import io.mockk.mockk
 import kotlinx.coroutines.async
 import org.hamcrest.MatcherAssert.assertThat
 import org.hamcrest.Matchers.hasItem
@@ -38,6 +35,10 @@ import org.hamcrest.Matchers.not
 import org.junit.jupiter.api.Assertions
 import org.junit.jupiter.api.Test
 import org.junit.jupiter.api.io.TempDir
+import com.intellij.platform.eel.EelApi
+import com.intellij.python.community.services.shared.UICustomization
+import com.jetbrains.python.PythonBinary
+import com.jetbrains.python.errorProcessing.PyResult
 import java.nio.file.Path
 import kotlin.io.path.deleteExisting
 import kotlin.io.path.pathString
@@ -56,7 +57,7 @@ class SystemPythonServiceShowCaseTest {
       val output = async {
         (if (systemPython.languageLevel.isPy3K) process.stdout else process.stderr).readWholeText()
       }
-      Assertions.assertEquals(0, process.exitCode.await(), "Wrong exit code")
+      Assertions.assertTrue(process.exitCode.await() == 0)
       val versionString = PythonSdkFlavor.getLanguageLevelFromVersionStringStaticSafe(output.await())!!
       Assertions.assertEquals(systemPython.languageLevel, versionString, "Wrong version")
     }
@@ -91,32 +92,40 @@ class SystemPythonServiceShowCaseTest {
 
   @Test
   fun testRefresh(@TestDisposable disposable: Disposable): Unit = timeoutRunBlocking(10.minutes) {
-    val mockProvider = mockk<SystemPythonProvider>()
-    coEvery { mockProvider.findSystemPythons(any()) } returns Result.failure(MessageError("..."))
-    coEvery { mockProvider.uiCustomization } returns null
+    val provider = CountingTestProvider(Result.failure(MessageError("...")))
     val sut = SystemPythonService()
+    // Warm up cache before registering test provider
     sut.findSystemPythons()
-    ApplicationManager.getApplication().registerExtension(SystemPythonProvider.EP, mockProvider, disposable)
+    ApplicationManager.getApplication().registerExtension(SystemPythonProvider.EP, provider, disposable)
     repeat(10) {
       sut.findSystemPythons()
     }
-    coVerify(exactly = 0) { mockProvider.findSystemPythons(any()) }
+    Assertions.assertTrue(provider.calls == 0, "Provider should not be called while cache is valid")
     sut.findSystemPythons(forceRefresh = true)
-    coVerify(atLeast = 1) { mockProvider.findSystemPythons(any()) }
+    Assertions.assertTrue(provider.calls >= 1, "Provider should be called after force refresh")
   }
 
   @RegistryKey("python.system.refresh.minutes", "0")
   @Test
   fun testDisableCache(@TestDisposable disposable: Disposable): Unit = timeoutRunBlocking(10.minutes) {
     val timesToRepeat = 5
-    val mockProvider = mockk<SystemPythonProvider>()
-    coEvery { mockProvider.findSystemPythons(any()) } returns Result.success(emptySet())
-    coEvery { mockProvider.uiCustomization } returns null
+    val provider = CountingTestProvider(Result.success(emptySet()))
     val sut = SystemPythonServiceImpl(this)
-    ApplicationManager.getApplication().registerExtension(SystemPythonProvider.EP, mockProvider, disposable)
+    ApplicationManager.getApplication().registerExtension(SystemPythonProvider.EP, provider, disposable)
     repeat(timesToRepeat) {
       sut.findSystemPythons()
     }
-    coVerify(exactly = timesToRepeat) { mockProvider.findSystemPythons(any()) }
+    Assertions.assertTrue(provider.calls == timesToRepeat)
+  }
+
+  private class CountingTestProvider(
+    private val result: PyResult<Set<PythonBinary>>,
+    override val uiCustomization: UICustomization? = null,
+  ) : SystemPythonProvider {
+    var calls: Int = 0
+    override suspend fun findSystemPythons(eelApi: EelApi): PyResult<Set<PythonBinary>> {
+      calls++
+      return result
+    }
   }
 }
\ No newline at end of file
diff --git a/python/services/system-python/tests/com/intellij/python/junit5Tests/env/systemPython/impl/EnvProviderTest.kt b/python/services/system-python/tests/com/intellij/python/junit5Tests/env/systemPython/impl/EnvProviderTest.kt
index 2693b4833ddf..7eee6f4b7331 100644
--- a/python/services/system-python/tests/com/intellij/python/junit5Tests/env/systemPython/impl/EnvProviderTest.kt
+++ b/python/services/system-python/tests/com/intellij/python/junit5Tests/env/systemPython/impl/EnvProviderTest.kt
@@ -15,14 +15,13 @@ import com.intellij.testFramework.registerExtension
 import com.jetbrains.python.PythonBinary
 import com.jetbrains.python.Result
 import com.jetbrains.python.getOrThrow
-import io.mockk.coEvery
-import io.mockk.mockk
 import org.hamcrest.MatcherAssert.assertThat
 import org.hamcrest.Matchers
 import org.junit.jupiter.api.Assertions.assertEquals
 import org.junit.jupiter.api.Assertions.assertTrue
 import org.junit.jupiter.api.Test
 import org.junit.jupiter.api.io.TempDir
+import com.intellij.platform.eel.EelApi
 import java.nio.file.Path
 
 @PyEnvTestCase
@@ -50,11 +49,16 @@ class EnvProviderTest {
   ): Unit = timeoutRunBlocking {
     val venvPython = createVenv(python, venvDir).getOrThrow()
     val ui = UICustomization("myui")
-    val provider = mockk<SystemPythonProvider>()
-    coEvery { provider.findSystemPythons(any()) } returns Result.success(setOf(venvPython))
-    coEvery { provider.uiCustomization } returns ui
+    val provider = InlineTestProvider(setOf(venvPython), ui)
     ApplicationManager.getApplication().registerExtension(SystemPythonProvider.EP, provider, disposable)
     val python = SystemPythonService().findSystemPythons(forceRefresh = true).first { it.pythonBinary == venvPython }
-    assertEquals(ui, python.ui, "Wrong UI")
+    assertTrue(ui == python.ui, "Wrong UI")
+  }
+
+  private class InlineTestProvider(
+    private val pythons: Set<PythonBinary>,
+    override val uiCustomization: UICustomization?
+  ) : SystemPythonProvider {
+    override suspend fun findSystemPythons(eelApi: EelApi) = Result.success(pythons)
   }
 }
\ No newline at end of file