diff --git a/mlir/test/lib/Transforms/TestDiagnosticHandler.cpp b/mlir/test/lib/Transforms/TestDiagnosticHandler.cpp
--- a/mlir/test/lib/Transforms/TestDiagnosticHandler.cpp
+++ b/mlir/test/lib/Transforms/TestDiagnosticHandler.cpp
@@ -14,11 +14,11 @@
 namespace {
 struct TestSourceMgrDiagnosticHandler : public SourceMgrDiagnosticHandler {
   explicit TestSourceMgrDiagnosticHandler(llvm::SourceMgr &mgr,
-                                                MLIRContext *ctx)
+                                          MLIRContext *ctx)
       : SourceMgrDiagnosticHandler(mgr, ctx, llvm::outs()) {}
 
   void emitTestDiagnostic(Operation *op) {
-        Diagnostic diag(op->getLoc(), DiagnosticSeverity::Note);
+    Diagnostic diag(op->getLoc(), DiagnosticSeverity::Note);
     emitDiagnostic(diag);
   }
 };
@@ -28,7 +28,7 @@
 
   void runOnFunction() override {
     llvm::SourceMgr fileSourceMgr;
-        TestSourceMgrDiagnosticHandler diagHandler(fileSourceMgr, &getContext());
+    TestSourceMgrDiagnosticHandler diagHandler(fileSourceMgr, &getContext());
     getFunction().walk([&](Operation *op) {
       if (isa<FuncOp>(op) || op->isKnownTerminator())
         return;
@@ -40,4 +40,4 @@
 } // end anonymous namespace
 
 static PassRegistration<TestDiagnosticHandler> pass("test-diagnostic-handler",
-                                                        "emit diagnostic for ops");
+                                                    "emit diagnostic for ops");