One more step in the process to learn about converting callbacks with promises.

01-parse-a-csv-file/step3.js

@@ -20,7 +20,7 @@ spectrum(async (err, samples) => {
     const ours = simple_parse(raw_csv);
 
     if(!equal(ours, good)) {
-      console.error("EXPECTED", good, "\nGOT", ours);
+      console.error("FAIL EXPECTED", good, "\nGOT", ours);
       process.exit(1);
     }
   }

01-parse-a-csv-file/step4.js

@@ -13,25 +13,21 @@ const simple_parse = (raw_csv) => {
   return result;
 }
 
-test('spectrum samples match', async t => {
-  const samples = await new Promise((res, rej) => {
-    spectrum((err, samples) => res(samples));
-  });
-
-  for(let sample of samples) {
-    const raw_csv = sample.csv.toString();
-    const good = [];
+test('failing spectrum samples match', async t => {
+  spectrum(async (err, samples) => {
+    for(let sample of samples) {
+      const raw_csv = sample.csv.toString();
+      const ours = simple_parse(raw_csv);
 
-    const count = await new Promise((res, rej) => {
       parseString(raw_csv)
-        .on('error', rej())
+        .on('error', t.fail())
         .on('data', row => good.push(row))
-        .on('end', rowCount => res(rowCount));
-    });
-
-    const ours = simple_parse(raw_csv);
-
-    t.is(ours.length, count);
-    t.is(ours, good);
-  }
+        .on('end', rowCount => {
+          if(!equal(ours, good)) {
+            console.error("FAIL EXPECTED", good, "\nGOT", ours);
+            process.exit(1);
+          }
+      });
+    }
+  });
 })

01-parse-a-csv-file/step5.js

@@ -0,0 +1,36 @@
+import spectrum from "csv-spectrum";
+import { parseString } from "fast-csv";
+import test from "ava";
+
+const simple_parse = (raw_csv) => {
+  const rows = raw_csv.split("\n");
+  const result = [];
+
+  for(let row of rows) {
+    result.push(row.split(','));
+  }
+
+  return result;
+}
+
+test('spectrum samples match', async t => {
+  const samples = await new Promise((res, rej) => {
+    spectrum((err, samples) => res(samples));
+  });
+
+  for(let sample of samples) {
+    const raw_csv = sample.csv.toString();
+    const good = [];
+
+    const count = await new Promise((res, rej) => {
+      parseString(raw_csv)
+        .on('error', err => rej(err))
+        .on('data', row => good.push(row))
+        .on('end', rowCount => res(rowCount));
+    });
+
+    const ours = simple_parse(raw_csv);
+
+    t.is(ours, good);
+  }
+})