diff --git a/.babelrc b/.babelrc
index d347b6a..7823717 100644
--- a/.babelrc
+++ b/.babelrc
@@ -1,4 +1,9 @@
 {
     "presets": ["power-assert"],
-    "sourceMaps": "inline"
+    "sourceMaps": "inline",
+    "env": {
+        "test": {
+            "plugins": [ "istanbul" ]
+        }
+    }
 }
diff --git a/package.json b/package.json
index 556c8e6..c7303be 100644
--- a/package.json
+++ b/package.json
@@ -20,8 +20,8 @@
     "postversion": "git push && git push --tags",
     "pretest": "npm run -s lint",
     "preversion": "npm test",
-    "test": "nyc --require babel-register npm run -s _mocha",
-    "watch": "npm run -s _mocha -- --require babel-register --watch --growl"
+    "test": "nyc npm run -s _mocha",
+    "watch": "npm run -s _mocha -- --watch --growl"
   },
   "dependencies": {
     "co": "^4.6.0",
@@ -39,12 +39,12 @@
   },
   "devDependencies": {
     "@mysticatea/eslint-plugin": "^5.0.1",
+    "babel-plugin-istanbul": "^5.1.1",
     "babel-preset-power-assert": "^2.0.0",
-    "babel-register": "^6.26.0",
     "codecov": "^3.0.2",
     "eslint": "^5.0.1",
     "mocha": "^5.2.0",
-    "nyc": "12.0.2",
+    "nyc": "^13.3.0",
     "opener": "^1.4.3",
     "p-event": "^2.0.0",
     "power-assert": "^1.6.0",
diff --git a/test/copy.js b/test/copy.js
index ca0893b..72a8b25 100644
--- a/test/copy.js
+++ b/test/copy.js
@@ -35,7 +35,8 @@ describe("The copy method", () => {
                 "test-ws/a/b/this-is.txt": "A pen",
                 "test-ws/a/b/that-is.txt": "A note",
                 "test-ws/a/b/no-copy.dat": "no-copy",
-            }))
+            })
+        )
         afterEach(() => teardownTestDir("test-ws"))
 
         /**
@@ -87,7 +88,8 @@ describe("The copy method", () => {
                 "test-ws/a/b/no-copy.dat": "no-copy",
                 "test-ws/b/b/remove.txt": "remove",
                 "test-ws/b/b/no-remove.dat": "no-remove",
-            }))
+            })
+        )
         afterEach(() => teardownTestDir("test-ws"))
 
         /**
@@ -231,7 +233,8 @@ describe("The copy method", () => {
                 "test-ws/a/hello.txt": "Hello",
                 "test-ws/a/b/pen.txt": "A pen",
                 "test-ws/a/c": null,
-            }))
+            })
+        )
         afterEach(() => teardownTestDir("test-ws"))
 
         /**
@@ -279,7 +282,8 @@ describe("The copy method", () => {
                 "test-ws/a/hello.txt": "Hello",
                 "test-ws/a/b/pen.txt": "A pen",
                 "test-ws/a/c": null,
-            }))
+            })
+        )
         afterEach(() => teardownTestDir("test-ws"))
 
         /**
@@ -324,7 +328,8 @@ describe("The copy method", () => {
                 "test-ws/a/b/this-is.txt": "A pen",
                 "test-ws/a/b/that-is.txt": "A note",
                 "test-ws/a/b/no-copy.dat": "no-copy",
-            }))
+            })
+        )
         afterEach(() => teardownTestDir("test-ws"))
 
         /**
@@ -673,7 +678,8 @@ describe("The copy method", () => {
 
     describe("should copy specified files with globs even if there are parentheses:", () => {
         beforeEach(() =>
-            setupTestDir({ "test-ws/a(paren)/hello.txt": "Hello" }))
+            setupTestDir({ "test-ws/a(paren)/hello.txt": "Hello" })
+        )
         afterEach(() => teardownTestDir("test-ws"))
 
         /**
diff --git a/test/util/util.js b/test/util/util.js
index 39d5c73..a461c2c 100644
--- a/test/util/util.js
+++ b/test/util/util.js
@@ -73,11 +73,10 @@ const readFile = (module.exports.content = function content(path) {
  */
 module.exports.setupTestDir = function setupTestDir(dataset) {
     return Promise.all(
-        Object.keys(dataset).map(
-            path =>
-                dataset[path] == null
-                    ? fs.ensureDir(path)
-                    : writeFile(path, dataset[path])
+        Object.keys(dataset).map(path =>
+            dataset[path] == null
+                ? fs.ensureDir(path)
+                : writeFile(path, dataset[path])
         )
     ).then(() => delay(250))
 }
diff --git a/test/watch.js b/test/watch.js
index 134d90c..c7b4f1e 100644
--- a/test/watch.js
+++ b/test/watch.js
@@ -115,7 +115,8 @@ describe("The watch method", () => {
                 "test-ws/a/b/this-is.txt": "A pen",
                 "test-ws/a/b/that-is.txt": "A note",
                 "test-ws/a/b/no-copy.dat": "no-copy",
-            }))
+            })
+        )
 
         /**
          * Verify.
@@ -267,7 +268,8 @@ describe("The watch method", () => {
                 "test-ws/a/b/this-is.txt": "A pen",
                 "test-ws/a/b/that-is.txt": "A note",
                 "test-ws/a/b/no-copy.dat": "no-copy",
-            }))
+            })
+        )
 
         /**
          * Verify.
@@ -319,7 +321,8 @@ describe("The watch method", () => {
                 "test-ws/a/b/no-copy.dat": "no-copy",
                 "test-ws/b/b/remove.txt": "remove",
                 "test-ws/b/b/no-remove.dat": "no-remove",
-            }))
+            })
+        )
 
         /**
          * Verify.
@@ -373,7 +376,8 @@ describe("The watch method", () => {
                 "test-ws/a/b/this-is.txt": "A pen",
                 "test-ws/a/b/that-is.txt": "A note",
                 "test-ws/a/b/no-copy.dat": "no-copy",
-            }))
+            })
+        )
 
         /**
          * Verify.
@@ -540,7 +544,8 @@ describe("The watch method", () => {
             setupTestDir({
                 "test-ws/a/hello.txt": "Hello",
                 "test-ws/a/hello.dat": "Hello",
-            }))
+            })
+        )
 
         /**
          * Verify.
@@ -591,7 +596,8 @@ describe("The watch method", () => {
             setupTestDir({
                 "test-ws/a/hello.txt": "Hello",
                 "test-ws/a/b/hello.txt": "Hello",
-            }))
+            })
+        )
 
         /**
          * Verify.
@@ -638,7 +644,8 @@ describe("The watch method", () => {
                 "test-ws/a/hello.txt": "Hello",
                 "test-ws/a/b/hello.txt": "Hello",
                 "test-ws/a/c": null,
-            }))
+            })
+        )
 
         /**
          * Verify.
@@ -684,7 +691,8 @@ describe("The watch method", () => {
             setupTestDir({
                 "test-ws/a/hello.txt": "Hello",
                 "test-ws/a/b/hello.txt": "Hello",
-            }))
+            })
+        )
 
         /**
          * Verify.
@@ -730,7 +738,8 @@ describe("The watch method", () => {
             setupTestDir({
                 //
                 "test-ws/a(paren)/hello.txt": "Hello",
-            }))
+            })
+        )
 
         /**
          * Verify.