diff --git a/test/__snapshots__/extract.spec.ts.snap b/test/__snapshots__/extract.spec.ts.snap
index cb0b4bf6f..d37f347a7 100644
--- a/test/__snapshots__/extract.spec.ts.snap
+++ b/test/__snapshots__/extract.spec.ts.snap
@@ -298,7 +298,7 @@ exports[`extractResult() extracts benchmark output from catch2 - issue16_output.
 }
 `;
 
-exports[`extractResult() extracts benchmark output from customBiggerIsBetter - customBiggerIsBetter_output.txt 1`] = `
+exports[`extractResult() extracts benchmark output from customBiggerIsBetter - customBiggerIsBetter_output.json 1`] = `
 {
   "benches": [
     {
@@ -331,7 +331,7 @@ Anything Else!",
 }
 `;
 
-exports[`extractResult() extracts benchmark output from customSmallerIsBetter - customSmallerIsBetter_output.txt 1`] = `
+exports[`extractResult() extracts benchmark output from customSmallerIsBetter - customSmallerIsBetter_output.json 1`] = `
 {
   "benches": [
     {
@@ -644,7 +644,7 @@ exports[`extractResult() extracts benchmark output from go - go_output.txt 1`] =
 }
 `;
 
-exports[`extractResult() extracts benchmark output from googlecpp - googlecpp_output.txt 1`] = `
+exports[`extractResult() extracts benchmark output from googlecpp - googlecpp_output.json 1`] = `
 {
   "benches": [
     {
diff --git a/test/data/extract/customBiggerIsBetter_output.txt b/test/data/extract/customBiggerIsBetter_output.json
similarity index 100%
rename from test/data/extract/customBiggerIsBetter_output.txt
rename to test/data/extract/customBiggerIsBetter_output.json
diff --git a/test/data/extract/customSmallerIsBetter_output.txt b/test/data/extract/customSmallerIsBetter_output.json
similarity index 100%
rename from test/data/extract/customSmallerIsBetter_output.txt
rename to test/data/extract/customSmallerIsBetter_output.json
diff --git a/test/data/extract/googlecpp_output.txt b/test/data/extract/googlecpp_output.json
similarity index 100%
rename from test/data/extract/googlecpp_output.txt
rename to test/data/extract/googlecpp_output.json
diff --git a/test/extract.spec.ts b/test/extract.spec.ts
index f5fdb2dbf..2e8817e2b 100644
--- a/test/extract.spec.ts
+++ b/test/extract.spec.ts
@@ -97,7 +97,7 @@ describe('extractResult()', function () {
         },
         {
             tool: 'googlecpp',
-            file: 'googlecpp_output.txt',
+            file: 'googlecpp_output.json',
         },
         {
             tool: 'pytest',
@@ -125,11 +125,11 @@ describe('extractResult()', function () {
         },
         {
             tool: 'customBiggerIsBetter',
-            file: 'customBiggerIsBetter_output.txt',
+            file: 'customBiggerIsBetter_output.json',
         },
         {
             tool: 'customSmallerIsBetter',
-            file: 'customSmallerIsBetter_output.txt',
+            file: 'customSmallerIsBetter_output.json',
         },
     ];