Ensure IC.isEnabled is not modified by tests

jps-plugin/jps-tests/test/org/jetbrains/kotlin/jps/build/AbstractIncrementalJpsTest.kt

@@ -75,6 +75,7 @@ abstract class AbstractIncrementalJpsTest(
     protected lateinit var workDir: File
     protected lateinit var projectDescriptor: ProjectDescriptor
     protected lateinit var lookupsDuringTest: MutableSet<LookupSymbol>
+    private var isICEnabledBackup: Boolean = false
 
     protected var mapWorkingToOriginalFile: MutableMap<File, File> = hashMapOf()
 
@@ -110,6 +111,7 @@ abstract class AbstractIncrementalJpsTest(
     override fun setUp() {
         super.setUp()
         lookupsDuringTest = hashSetOf()
+        isICEnabledBackup = IncrementalCompilation.isEnabled()
         IncrementalCompilation.setIsEnabled(true)
 
         if (DEBUG_LOGGING_ENABLED) {
@@ -123,6 +125,7 @@ abstract class AbstractIncrementalJpsTest(
         (AbstractIncrementalJpsTest::projectDescriptor).javaField!![this] = null
         (AbstractIncrementalJpsTest::systemPropertiesBackup).javaField!![this] = null
         lookupsDuringTest.clear()
+        IncrementalCompilation.setIsEnabled(isICEnabledBackup)
         super.tearDown()
     }
 

jps-plugin/jps-tests/test/org/jetbrains/kotlin/jps/build/AbstractIncrementalLazyCachesTest.kt

@@ -34,6 +34,19 @@ abstract class AbstractIncrementalLazyCachesTest : AbstractIncrementalJpsTest()
     private val expectedCachesFileName: String
         get() = "expected-kotlin-caches.txt"
 
+    private var isICEnabledBackup: Boolean = false
+
+    override fun setUp() {
+        super.setUp()
+        isICEnabledBackup = IncrementalCompilation.isEnabled()
+        IncrementalCompilation.setIsEnabled(true)
+    }
+
+    override fun tearDown() {
+        IncrementalCompilation.setIsEnabled(isICEnabledBackup)
+        super.tearDown()
+    }
+
     override fun doTest(testDataPath: String) {
         super.doTest(testDataPath)