diff --git a/.nycrc.yml b/.nycrc.yml
new file mode 100644
index 00000000..03976439
--- /dev/null
+++ b/.nycrc.yml
@@ -0,0 +1,2 @@
+# https://github.com/istanbuljs/nyc#common-configuration-options
+all: true
\ No newline at end of file
diff --git a/test/prism.spec.js b/test/prism.spec.js
index 2855e888..32055a76 100644
--- a/test/prism.spec.js
+++ b/test/prism.spec.js
@@ -77,8 +77,8 @@ describe('prismHighlight', () => {
       '}'
     ].join('\n');
 
-    // Use language: 'plain' to simplify the test
-    const result = prismHighlight(input, { tab: '  ', lang: 'plain' });
+    // Use language: 'plain-text' for not supported language with Prism
+    const result = prismHighlight(input, { tab: '  ', lang: 'plain-text' });
 
     result.should.contains(escapeHTML(input.replace(/\t/g, '  ')));