diff --git a/src/testRunner/unittests/tsbuild/helpers.ts b/src/testRunner/unittests/tsbuild/helpers.ts
index f5ad6421362c8..899d4d61020f8 100644
--- a/src/testRunner/unittests/tsbuild/helpers.ts
+++ b/src/testRunner/unittests/tsbuild/helpers.ts
@@ -653,7 +653,8 @@ interface Symbol {
                 }
                 Harness.Baseline.runBaseline(
                     `${isBuild(commandLineArgs) ? "tsbuild" : "tsc"}/${scenario}/${subScenario.split(" ").join("-")}-discrepancies.js`,
-                    baselines ? baselines.join("\r\n") : null // eslint-disable-line no-null/no-null
+                    baselines ? baselines.join("\r\n") : null, // eslint-disable-line no-null/no-null
+                    { PrintDiff: true }
                 );
             });
         });
diff --git a/src/testRunner/unittests/tsbuild/sample.ts b/src/testRunner/unittests/tsbuild/sample.ts
index ebf13cc9c86c6..3797c8fb747d6 100644
--- a/src/testRunner/unittests/tsbuild/sample.ts
+++ b/src/testRunner/unittests/tsbuild/sample.ts
@@ -285,7 +285,7 @@ namespace ts {
                 verifyBuildNextResult(); // logic
                 verifyBuildNextResult();// tests
                 verifyBuildNextResult(); // All Done
-                Harness.Baseline.runBaseline(`tsbuild/sample1/building-using-getNextInvalidatedProject.js`, baseline.join("\r\n"));
+                Harness.Baseline.runBaseline(`tsbuild/sample1/building-using-getNextInvalidatedProject.js`, baseline.join("\r\n"), { PrintDiff: true });
 
                 function verifyBuildNextResult() {
                     const project = builder.getNextInvalidatedProject();
@@ -365,7 +365,7 @@ namespace ts {
                 // Rebuild this project
                 system.appendFile(logicIndex.path, `export class cNew {}`);
                 verifyInvalidation("Dts change to Logic");
-                Harness.Baseline.runBaseline(`tsbuild/sample1/invalidates-projects-correctly.js`, baseline.join("\r\n"));
+                Harness.Baseline.runBaseline(`tsbuild/sample1/invalidates-projects-correctly.js`, baseline.join("\r\n"), { PrintDiff: true });
 
                 function verifyInvalidation(heading: string) {
                     // Rebuild this project
diff --git a/src/testRunner/unittests/tsc/cancellationToken.ts b/src/testRunner/unittests/tsc/cancellationToken.ts
index 462b08c9f084f..8cdc2f1941c22 100644
--- a/src/testRunner/unittests/tsc/cancellationToken.ts
+++ b/src/testRunner/unittests/tsc/cancellationToken.ts
@@ -105,7 +105,7 @@ namespace ts.tscWatch {
                 noChange("Clean build");
                 baselineCleanBuild();
 
-                Harness.Baseline.runBaseline(`tsc/cancellationToken/${scenario.split(" ").join("-")}.js`, baseline.join("\r\n"));
+                Harness.Baseline.runBaseline(`tsc/cancellationToken/${scenario.split(" ").join("-")}.js`, baseline.join("\r\n"), { PrintDiff: true });
 
                 function noChange(caption: string) {
                     oldSnap = applyChange(sys, baseline, noop, caption);
diff --git a/src/testRunner/unittests/tsc/helpers.ts b/src/testRunner/unittests/tsc/helpers.ts
index 81d22823e0b01..eaf21fe534159 100644
--- a/src/testRunner/unittests/tsc/helpers.ts
+++ b/src/testRunner/unittests/tsc/helpers.ts
@@ -208,7 +208,7 @@ ${patch ? vfs.formatPatch(patch) : ""}`
     export function verifyTscBaseline(sys: () => { baseLine: TscCompileSystem["baseLine"]; }) {
         it(`Generates files matching the baseline`, () => {
             const { file, text } = sys().baseLine();
-            Harness.Baseline.runBaseline(file, text);
+            Harness.Baseline.runBaseline(file, text, { PrintDiff: true });
         });
     }
     export interface VerifyTscCompileLike {
diff --git a/src/testRunner/unittests/tscWatch/helpers.ts b/src/testRunner/unittests/tscWatch/helpers.ts
index bad2dc7cf4931..bee3c6127829d 100644
--- a/src/testRunner/unittests/tscWatch/helpers.ts
+++ b/src/testRunner/unittests/tscWatch/helpers.ts
@@ -277,7 +277,7 @@ namespace ts.tscWatch {
                 baselineDependencies,
             });
         }
-        Harness.Baseline.runBaseline(`${isBuild(commandLineArgs) ? "tsbuild" : "tsc"}${isWatch(commandLineArgs) ? "Watch" : ""}/${scenario}/${subScenario.split(" ").join("-")}.js`, baseline.join("\r\n"));
+        Harness.Baseline.runBaseline(`${isBuild(commandLineArgs) ? "tsbuild" : "tsc"}${isWatch(commandLineArgs) ? "Watch" : ""}/${scenario}/${subScenario.split(" ").join("-")}.js`, baseline.join("\r\n"), { PrintDiff: true });
     }
 
     function isWatch(commandLineArgs: readonly string[]) {
diff --git a/src/testRunner/unittests/tscWatch/incremental.ts b/src/testRunner/unittests/tscWatch/incremental.ts
index 8d49e9ba2468c..35ee31fab2c74 100644
--- a/src/testRunner/unittests/tscWatch/incremental.ts
+++ b/src/testRunner/unittests/tscWatch/incremental.ts
@@ -40,7 +40,7 @@ namespace ts.tscWatch {
                 build(oldSnap);
             }
 
-            Harness.Baseline.runBaseline(`${isBuild(argsToPass) ? "tsbuild/watchMode" : "tscWatch"}/incremental/${subScenario.split(" ").join("-")}-${incremental ? "incremental" : "watch"}.js`, baseline.join("\r\n"));
+            Harness.Baseline.runBaseline(`${isBuild(argsToPass) ? "tsbuild/watchMode" : "tscWatch"}/incremental/${subScenario.split(" ").join("-")}-${incremental ? "incremental" : "watch"}.js`, baseline.join("\r\n"), { PrintDiff: true });
 
             function build(oldSnap: SystemSnap) {
                 const closer = executeCommandLine(
diff --git a/src/testRunner/unittests/tscWatch/programUpdates.ts b/src/testRunner/unittests/tscWatch/programUpdates.ts
index a17f857024f11..8cd3eaf460652 100644
--- a/src/testRunner/unittests/tscWatch/programUpdates.ts
+++ b/src/testRunner/unittests/tscWatch/programUpdates.ts
@@ -565,7 +565,7 @@ export class A {
             sys.checkTimeoutQueueLength(0);
             baseline.push(`First program is not updated:: ${getPrograms() === emptyArray}`);
             baseline.push(`Second program is not updated:: ${getPrograms2() === emptyArray}`);
-            Harness.Baseline.runBaseline(`tscWatch/${scenario}/two-watch-programs-are-not-affected-by-each-other.js`, baseline.join("\r\n"));
+            Harness.Baseline.runBaseline(`tscWatch/${scenario}/two-watch-programs-are-not-affected-by-each-other.js`, baseline.join("\r\n"), { PrintDiff: true });
         });
 
         verifyTscWatch({
diff --git a/src/testRunner/unittests/tscWatch/watchApi.ts b/src/testRunner/unittests/tscWatch/watchApi.ts
index 8182e276d9617..2c0f2de1883e8 100644
--- a/src/testRunner/unittests/tscWatch/watchApi.ts
+++ b/src/testRunner/unittests/tscWatch/watchApi.ts
@@ -390,10 +390,10 @@ namespace ts.tscWatch {
                 emitBaseline = undefined!;
             });
             it("noEmit with composite writes the tsbuildinfo with pending affected files correctly", () => {
-                Harness.Baseline.runBaseline(`tscWatch/watchApi/noEmit-with-composite-with-semantic-builder.js`, baseline.join("\r\n"));
+                Harness.Baseline.runBaseline(`tscWatch/watchApi/noEmit-with-composite-with-semantic-builder.js`, baseline.join("\r\n"), { PrintDiff: true });
             });
             it("baseline in createEmitAndSemanticDiagnosticsBuilderProgram:: noEmit with composite writes the tsbuildinfo with pending affected files correctly", () => {
-                Harness.Baseline.runBaseline(`tscWatch/watchApi/noEmit-with-composite-with-emit-builder.js`, emitBaseline.join("\r\n"));
+                Harness.Baseline.runBaseline(`tscWatch/watchApi/noEmit-with-composite-with-emit-builder.js`, emitBaseline.join("\r\n"), { PrintDiff: true });
             });
         });
 
@@ -426,10 +426,10 @@ namespace ts.tscWatch {
             });
 
             it("noEmitOnError with composite writes the tsbuildinfo with pending affected files correctly", () => {
-                Harness.Baseline.runBaseline(`tscWatch/watchApi/noEmitOnError-with-composite-with-semantic-builder.js`, baseline.join("\r\n"));
+                Harness.Baseline.runBaseline(`tscWatch/watchApi/noEmitOnError-with-composite-with-semantic-builder.js`, baseline.join("\r\n"), { PrintDiff: true });
             });
             it("baseline in createEmitAndSemanticDiagnosticsBuilderProgram:: noEmitOnError with composite writes the tsbuildinfo with pending affected files correctly", () => {
-                Harness.Baseline.runBaseline(`tscWatch/watchApi/noEmitOnError-with-composite-with-emit-builder.js`, emitBaseline.join("\r\n"));
+                Harness.Baseline.runBaseline(`tscWatch/watchApi/noEmitOnError-with-composite-with-emit-builder.js`, emitBaseline.join("\r\n"), { PrintDiff: true });
             });
         });
 
@@ -473,7 +473,7 @@ namespace ts.tscWatch {
                 sys,
                 oldSnap,
             });
-            Harness.Baseline.runBaseline(`tscWatch/watchApi/semantic-builder-emitOnlyDts.js`, baseline.join("\r\n"));
+            Harness.Baseline.runBaseline(`tscWatch/watchApi/semantic-builder-emitOnlyDts.js`, baseline.join("\r\n"), { PrintDiff: true });
         });
     });
 
diff --git a/src/testRunner/unittests/tsserver/helpers.ts b/src/testRunner/unittests/tsserver/helpers.ts
index a51a558732142..19cbc01a43a32 100644
--- a/src/testRunner/unittests/tsserver/helpers.ts
+++ b/src/testRunner/unittests/tsserver/helpers.ts
@@ -150,7 +150,7 @@ namespace ts.projectSystem {
 
     export function baselineTsserverLogs(scenario: string, subScenario: string, sessionOrService: { logger: Logger; }) {
         Debug.assert(sessionOrService.logger.logs.length); // Ensure caller used in memory logger
-        Harness.Baseline.runBaseline(`tsserver/${scenario}/${subScenario.split(" ").join("-")}.js`, sessionOrService.logger.logs.join("\r\n"));
+        Harness.Baseline.runBaseline(`tsserver/${scenario}/${subScenario.split(" ").join("-")}.js`, sessionOrService.logger.logs.join("\r\n"), { PrintDiff: true });
     }
 
     export function appendAllScriptInfos(service: server.ProjectService, logs: string[]) {