diff --git a/__tests__/env.js b/__tests__/env.js
deleted file mode 100644
index e79aacd9..00000000
--- a/__tests__/env.js
+++ /dev/null
@@ -1 +0,0 @@
-process.env.UNIT_TEST = true
\ No newline at end of file
diff --git a/__tests__/env.ts b/__tests__/env.ts
new file mode 100644
index 00000000..3a0445b1
--- /dev/null
+++ b/__tests__/env.ts
@@ -0,0 +1 @@
+process.env.UNIT_TEST = 'true'
\ No newline at end of file
diff --git a/jest.config.js b/jest.config.js
index 6114ff66..5001d643 100644
--- a/jest.config.js
+++ b/jest.config.js
@@ -8,5 +8,5 @@ module.exports = {
     '^.+\\.ts$': 'ts-jest'
   },
   verbose: true,
-  setupFiles: ["<rootDir>/__tests__/env.js"]
+  setupFiles: ["<rootDir>/__tests__/env.ts"]
 }
\ No newline at end of file