feat(#50): filter undefined, empty

src/tokens.js

@@ -31,7 +31,7 @@ const fs = require('fs');
 function tokens(file) {
   try {
     const content = fs.readFileSync(file, 'utf8');
-    return content.split('\n');
+    return content.split('\n').filter((c) => c !== undefined && c !== "");
   } catch (error) {
     console.error(`Error reading tokens file: ${error.message}`);
     process.exit(1);

test/resources/one-empty.txt

@@ -0,0 +1 @@
+aaa

test/tokens.test.js

@@ -40,7 +40,16 @@ describe('Test case for tokens.js', function() {
     assert.deepEqual(
       fetched,
       expected,
-      `fetched tokens ${fetched} don't match with expected ${expected}`
+      `parsed tokens ${fetched} don't match with expected ${expected}`
+    )
+  });
+  it("fetches one token with one empty line", function () {
+    const parsed = tokens("test/resources/one-empty.txt");
+    const expected = ["aaa"];
+    assert.deepEqual(
+      parsed,
+      expected,
+      `parsed tokens ${parsed} don't match with expected tokens: ${expected}`
     )
   });
 });