diff --git a/idea/idea-completion/testData/basic/common/ImportedEnumMembers.kt b/idea/idea-completion/testData/basic/common/ImportedEnumMembers.kt
index 6aaf2acacb0..20d22b2a9cb 100644
--- a/idea/idea-completion/testData/basic/common/ImportedEnumMembers.kt
+++ b/idea/idea-completion/testData/basic/common/ImportedEnumMembers.kt
@@ -1,3 +1,4 @@
+// FIR_COMPARISON
 package p
 
 import java.lang.Character.*
diff --git a/idea/idea-completion/testData/basic/common/InEmptyImport.kt b/idea/idea-completion/testData/basic/common/InEmptyImport.kt
index 14cd0e22826..17a540767d7 100644
--- a/idea/idea-completion/testData/basic/common/InEmptyImport.kt
+++ b/idea/idea-completion/testData/basic/common/InEmptyImport.kt
@@ -1,3 +1,4 @@
+// FIR_COMPARISON
 package Test
 
 import <caret>
diff --git a/idea/idea-completion/testData/basic/common/InImport.kt b/idea/idea-completion/testData/basic/common/InImport.kt
index 9ba1e9cf6eb..7189ce5a28c 100644
--- a/idea/idea-completion/testData/basic/common/InImport.kt
+++ b/idea/idea-completion/testData/basic/common/InImport.kt
@@ -1,3 +1,4 @@
+// FIR_COMPARISON
 package Test
 
 import kotlin.<caret>
diff --git a/idea/idea-completion/testData/basic/common/TopLevelClassName1.kt b/idea/idea-completion/testData/basic/common/TopLevelClassName1.kt
index 4f82c0af068..895fd4cda96 100644
--- a/idea/idea-completion/testData/basic/common/TopLevelClassName1.kt
+++ b/idea/idea-completion/testData/basic/common/TopLevelClassName1.kt
@@ -1,3 +1,4 @@
+// FIR_COMPARISON
 class <caret>
 
 // EXIST: { lookupString: "TopLevelClassName1", itemText: "TopLevelClassName1"  }
\ No newline at end of file
diff --git a/idea/idea-completion/testData/basic/common/TopLevelClassName6.kt b/idea/idea-completion/testData/basic/common/TopLevelClassName6.kt
index ae1aff7741d..35df4e57416 100644
--- a/idea/idea-completion/testData/basic/common/TopLevelClassName6.kt
+++ b/idea/idea-completion/testData/basic/common/TopLevelClassName6.kt
@@ -1,3 +1,4 @@
+// FIR_COMPARISON
 object <caret>
 
 // EXIST: { lookupString: "TopLevelClassName6", itemText: "TopLevelClassName6"  }
\ No newline at end of file
diff --git a/idea/idea-completion/testData/basic/common/annotations/ParameterAnnotation7.kt b/idea/idea-completion/testData/basic/common/annotations/ParameterAnnotation7.kt
index 220d6dc3e1a..c5a8cd76ab6 100644
--- a/idea/idea-completion/testData/basic/common/annotations/ParameterAnnotation7.kt
+++ b/idea/idea-completion/testData/basic/common/annotations/ParameterAnnotation7.kt
@@ -1,3 +1,4 @@
+// FIR_COMPARISON
 fun foo(@kotlin.<caret>) { }
 
 // INVOCATION_COUNT: 1
diff --git a/idea/idea-completion/testData/basic/common/autoPopup/NoAutopopupInFunName.kt b/idea/idea-completion/testData/basic/common/autoPopup/NoAutopopupInFunName.kt
index b936fd5f832..9b1dbb146be 100644
--- a/idea/idea-completion/testData/basic/common/autoPopup/NoAutopopupInFunName.kt
+++ b/idea/idea-completion/testData/basic/common/autoPopup/NoAutopopupInFunName.kt
@@ -1,3 +1,4 @@
+// FIR_COMPARISON
 fun f<caret>
 
 // INVOCATION_COUNT: 0
diff --git a/idea/idea-completion/testData/basic/common/staticMembers/ImportsFromEnumEntry.kt b/idea/idea-completion/testData/basic/common/staticMembers/ImportsFromEnumEntry.kt
index 6a4bf901045..1631dda574b 100644
--- a/idea/idea-completion/testData/basic/common/staticMembers/ImportsFromEnumEntry.kt
+++ b/idea/idea-completion/testData/basic/common/staticMembers/ImportsFromEnumEntry.kt
@@ -1,3 +1,4 @@
+// FIR_COMPARISON
 package b
 
 import b.Bar.A.<caret>
diff --git a/idea/idea-completion/testData/basic/common/staticMembers/ImportsFromNonObject.kt b/idea/idea-completion/testData/basic/common/staticMembers/ImportsFromNonObject.kt
index a21912a3b9a..189c1d624d7 100644
--- a/idea/idea-completion/testData/basic/common/staticMembers/ImportsFromNonObject.kt
+++ b/idea/idea-completion/testData/basic/common/staticMembers/ImportsFromNonObject.kt
@@ -1,3 +1,4 @@
+// FIR_COMPARISON
 package b
 
 import b.A.<caret>
diff --git a/idea/idea-completion/testData/basic/common/staticMembers/JavaStaticMethodsNoDuplicatesFromBases.kt b/idea/idea-completion/testData/basic/common/staticMembers/JavaStaticMethodsNoDuplicatesFromBases.kt
index ba42f15ba72..6b0611158fa 100644
--- a/idea/idea-completion/testData/basic/common/staticMembers/JavaStaticMethodsNoDuplicatesFromBases.kt
+++ b/idea/idea-completion/testData/basic/common/staticMembers/JavaStaticMethodsNoDuplicatesFromBases.kt
@@ -1,3 +1,4 @@
+// FIR_COMPARISON
 import javax.swing.SwingUtilities
 
 class A : SwingUtilities {
diff --git a/idea/idea-completion/testData/handlers/multifile/NoParenthesisInImports-1.kt b/idea/idea-completion/testData/handlers/multifile/NoParenthesisInImports-1.kt
index 0f4e7eb9580..89dcbee19e2 100644
--- a/idea/idea-completion/testData/handlers/multifile/NoParenthesisInImports-1.kt
+++ b/idea/idea-completion/testData/handlers/multifile/NoParenthesisInImports-1.kt
@@ -1,3 +1,4 @@
+// FIR_COMPARISON
 package testing
 
 import testing.some.someF<caret>
\ No newline at end of file
diff --git a/idea/idea-completion/testData/handlers/multifile/NoParenthesisInImports.kt.after b/idea/idea-completion/testData/handlers/multifile/NoParenthesisInImports.kt.after
index ad1b9dc1f72..86648757281 100644
--- a/idea/idea-completion/testData/handlers/multifile/NoParenthesisInImports.kt.after
+++ b/idea/idea-completion/testData/handlers/multifile/NoParenthesisInImports.kt.after
@@ -1,3 +1,4 @@
+// FIR_COMPARISON
 package testing
 
 import testing.some.someFun
\ No newline at end of file
diff --git a/idea/idea-completion/testData/handlers/multifile/StaticMethodFromGrandParent-1.kt b/idea/idea-completion/testData/handlers/multifile/StaticMethodFromGrandParent-1.kt
index 983f43016c5..420ec6fb791 100644
--- a/idea/idea-completion/testData/handlers/multifile/StaticMethodFromGrandParent-1.kt
+++ b/idea/idea-completion/testData/handlers/multifile/StaticMethodFromGrandParent-1.kt
@@ -1,3 +1,4 @@
+// FIR_COMPARISON
 class Inheritor : Base() {
     init {
         fooBa<caret>
diff --git a/idea/idea-completion/testData/handlers/multifile/StaticMethodFromGrandParent.kt.after b/idea/idea-completion/testData/handlers/multifile/StaticMethodFromGrandParent.kt.after
index 5349a1ae558..0d43f92fae7 100644
--- a/idea/idea-completion/testData/handlers/multifile/StaticMethodFromGrandParent.kt.after
+++ b/idea/idea-completion/testData/handlers/multifile/StaticMethodFromGrandParent.kt.after
@@ -1,3 +1,4 @@
+// FIR_COMPARISON
 class Inheritor : Base() {
     init {
         fooBar()
diff --git a/idea/idea-completion/testData/handlers/multifile/TopLevelValImportInStringTemplate.kt.after b/idea/idea-completion/testData/handlers/multifile/TopLevelValImportInStringTemplate.kt.after
index 363d683ac66..1228e06bb89 100644
--- a/idea/idea-completion/testData/handlers/multifile/TopLevelValImportInStringTemplate.kt.after
+++ b/idea/idea-completion/testData/handlers/multifile/TopLevelValImportInStringTemplate.kt.after
@@ -1,3 +1,4 @@
+// FIR_COMPARISON
 package some
 
 import other.someProp