diff --git a/test/cli.test.ts b/test/cli.test.ts
index 749245d..fe25808 100644
--- a/test/cli.test.ts
+++ b/test/cli.test.ts
@@ -26,6 +26,8 @@ function createTempDir(format: string, path = TMP_DIR, suffix = 'fse-cli-test-')
     }
 }
 
+const DEBUG = env.CLI_TEST_DEBUG && env.CLI_TEST_DEBUG === 'true';
+
 describe("The fs-extra CLI", () => {
 
     describe("Calling CLI", () => {
@@ -35,9 +37,9 @@ describe("The fs-extra CLI", () => {
             const args = {};
             const userInputs = [];
             const options = {
-                // env: { DEBUG: true },  // false by default
                 // timeout: 200,          // 100 ms by default
-                // maxTimeout: 0          // 10 s by default; if "0" then no timeout
+                // maxTimeout: 0,         // 10 s by default; if "0" then no timeout
+                env: { DEBUG }           // false by default
             };
             const foundRegex = new RegExp('^ERROR:\\s+No\\s+task\\s+specified', 'm');
             run(
@@ -62,9 +64,9 @@ describe("The fs-extra CLI", () => {
             const args = { app: [unknownTask] };
             const userInputs = [];
             const options = {
-                // env: { DEBUG: true },  // false by default
                 // timeout: 200,          // 100 ms by default
-                // maxTimeout: 0          // 10 s by default; if "0" then no timeout
+                // maxTimeout: 0,         // 10 s by default; if "0" then no timeout
+                env: { DEBUG }           // false by default
             };
             const foundRegex = new RegExp(`^ERROR:\\s+Unknown\\s+task\\s+'${unknownTask}'`, 'm');
             run(
@@ -83,6 +85,42 @@ describe("The fs-extra CLI", () => {
         });
     });
 
+    describe("Calling 'emptyDir'", () => {
+        it("When existing directory, it will be purged", function (done) { // don't pass 'done' as argument! with async/await
+            const dirToBePurged = createTempDir("Test 'Purge a directory', unable to create a temporary directory based on '%s' & '%s': %s");
+            const fileToBeRemoved = join(dirToBePurged, 'toBeRemoved.txt');
+            closeSync(openSync(fileToBeRemoved, 'w'));
+            const script = `${LIB_DIR}`; // ie index.js
+            const args = { app: ['emptyDir', dirToBePurged] };
+            const userInputs = [];
+            const options = {
+                // timeout: 200,          // 100 ms by default
+                // maxTimeout: 0,         // 10 s by default; if "0" then no timeout
+                env: { DEBUG }           // false by default
+            };
+            run(
+                script,
+                args,
+                userInputs,
+                options
+            )
+                .then(() => {
+                    expect(existsSync(dirToBePurged), "directory should still exists").to.be.true;
+                    expect(!existsSync(fileToBeRemoved), "file should have been removed").to.be.true;
+                    done();
+                })
+                .catch(error => {
+                    done(error);
+                })
+                .finally(() => {
+                    try {
+                        rmdirSync(dirToBePurged, { recursive: true });
+                    } catch (e) { /* do nothing */ }
+                });
+
+        });
+    });
+
     describe("Calling 'remove'", () => {
         // first check if the jog is done
         it("When existing directory, it will be removed", function (done) { // don't pass 'done' as argument! with async/await
@@ -92,9 +130,9 @@ describe("The fs-extra CLI", () => {
             const args = { app: ['remove', dirToBeRemoved] };
             const userInputs = [];
             const options = {
-                // env: { DEBUG: true },  // false by default
                 // timeout: 200,          // 100 ms by default
-                // maxTimeout: 0          // 10 s by default; if "0" then no timeout
+                // maxTimeout: 0,         // 10 s by default; if "0" then no timeout
+                env: { DEBUG }           // false by default
             };
             run(
                 script,
@@ -127,9 +165,9 @@ describe("The fs-extra CLI", () => {
             const args = { app: ['mkdirp', dirToBeCreated] };
             const userInputs = [];
             const options = {
-                // env: { DEBUG: true },  // false by default
                 // timeout: 200,          // 100 ms by default
-                // maxTimeout: 0          // 10 s by default; if "0" then no timeout
+                // maxTimeout: 0,         // 10 s by default; if "0" then no timeout
+                env: { DEBUG }           // false by default
             };
             run(
                 script,
@@ -164,9 +202,9 @@ describe("The fs-extra CLI", () => {
             const args = { app: ['ensureFile', fileToBeCreated] };
             const userInputs = [];
             const options = {
-                // env: { DEBUG: true },  // false by default
                 // timeout: 200,          // 100 ms by default
-                // maxTimeout: 0          // 10 s by default; if "0" then no timeout
+                // maxTimeout: 0 ,        // 10 s by default; if "0" then no timeout
+                env: { DEBUG }           // false by default
             };
             run(
                 script,
@@ -220,9 +258,9 @@ describe("The fs-extra CLI", () => {
             const args = { app: ['copy', fileToBeCopied, fileCopy] };
             const userInputs = [];
             const options = {
-                // env: { DEBUG: true },  // false by default
                 // timeout: 200,          // 100 ms by default
-                // maxTimeout: 0          // 10 s by default; if "0" then no timeout
+                // maxTimeout: 0,         // 10 s by default; if "0" then no timeout
+                env: { DEBUG }           // false by default
             };
             run(
                 script,
@@ -278,9 +316,9 @@ describe("The fs-extra CLI", () => {
             const args = { app: ['move', fileToBeMovedPath, movedFilePath] };
             const userInputs = [];
             const options = {
-                // env: { DEBUG: true },  // false by default
                 // timeout: 200,          // 100 ms by default
-                // maxTimeout: 0          // 10 s by default; if "0" then no timeout
+                // maxTimeout: 0,         // 10 s by default; if "0" then no timeout
+                env: { DEBUG }           // false by default
             };
             run(
                 script,
@@ -320,9 +358,9 @@ describe("The fs-extra CLI", () => {
             const args = { app: ['version'] };
             const userInputs = [];
             const options = {
-                // env: { DEBUG: true },  // false by default
                 // timeout: 200,          // 100 ms by default
-                // maxTimeout: 0          // 10 s by default; if "0" then no timeout
+                // maxTimeout: 0,         // 10 s by default; if "0" then no timeout
+                env: { DEBUG }           // false by default
             };
             const foundRegex = new RegExp(`^@atao60/fse-cli\\s+${semverPattern}\\s+\\(fs-extra\\s+${semverPattern}\\)$`);
             run(
@@ -349,9 +387,9 @@ describe("The fs-extra CLI", () => {
             const userInputs = [];
             const options = {
                 // timeout: 200,          // 100 ms by default
-                // maxTimeout: 0,          // 10 s by default; if "0" then no timeout
+                // maxTimeout: 0,         // 10 s by default; if "0" then no timeout
                 env: { 
-                    // DEBUG: true,   // false by default
+                    DEBUG,                                   // false by default
                     FORCE_COLOR: supportsColor.stdout.level  // 
                 }            
             };