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Added TASK.md to the chat.
Added package.json to the chat.
Added src\contacts.js to the chat.
Added src\test.js to the chat.
Added verify.js to the chat.


--------------
► **THINKING**

Okay, let's see. The user wants me to complete the fixture task by implementing
the mergeDuplicates function using TDD. The goal is to have node verify.js
pass.

First, I need to check what's missing. The TASK.md says to implement
mergeDuplicates() that merges contacts with the same email, keeping the most
complete record (non-empty fields from the newer record take priority). The
existing tests in verify.js check for the function's existence, export, tests
in test.js, at least 4 test cases, and that all tests pass.

Looking at the current files:

In src/contacts.js, there's a TODO for mergeDuplicates. The module exports
createContact, findByEmail, addContact, removeContact, but not mergeDuplicates
yet. So I need to add that function.

In src/test.js, there are existing tests for the other functions, but the TODO
says to add tests for mergeDuplicates. The verify.js checks that there are at
least 4 test cases for merge, so I need to add those tests.

Wait, the verify.js has a test called 'At least 4 test cases for merge', which
counts test() calls mentioning merge/duplicate. The current test.js has
existing tests for createContact, findByEmail, etc., but no tests for
mergeDuplicates. So I need to add 4 test cases in test.js for mergeDuplicates.

Also, the verify.js has specific tests for mergeDuplicates functionality, like
handling basic merge, keeping most complete data, preserving non-duplicates. So
the tests in test.js need to cover those.

Let me check the current test.js. It has tests for createContact, findByEmail,
addContact, removeContact. The TODO says to add tests for mergeDuplicates. So I
need to add those tests.

The verify.js test 'mergeDuplicates handles basic merge' expects the merged
array to have 1 contact with the email 'alice@test.com'. So the test should
check that.

Similarly, the other tests check for field priority and preserving
non-duplicates.

So first, I need to implement mergeDuplicates in contacts.js.

How should mergeDuplicates work?

The function should take an array of contacts, group them by email, and for
each email, merge the contacts into one, keeping the most complete data
(non-null fields from the newer record? Wait, the acceptance criteria says
"non-empty fields from the newer record take priority". Wait, the problem
statement says "non-empty fields from the newer record take priority". Wait,
but the example in the verify.js test:

test('mergeDuplicates handles basic merge', () => {
  const contacts = [
    createContact('Alice', 'alice@test.com', '555', 'Acme'),
    createContact('Alice Johnson', 'alice@test.com', null, null),
  ];
  const merged = mergeDuplicates(contacts);
  if (merged.length !== 1) throw new Error(...);
  if (merged[0].email !== 'alice@test.com') ...
});

So the merged contact should have name 'Alice Johnson' (from the second
contact), email 'alice@test.com', phone '555' (from first contact?), company
'Acme' (from first contact). Wait, but the second contact has phone null and
company null. So the first contact has phone '555' and company 'Acme', so those
should be kept. The name from the second contact is 'Alice Johnson', which is
more complete than 'Alice' from the first. So the merged contact should have
name 'Alice Johnson', email 'alice@test.com', phone '555', company 'Acme'.

Wait, but the test expects merged[0].email to be 'alice@test.com', which it is.
So the merge should take the non-null fields from both, but the test is
checking that the email is correct, which it is.

So the mergeDuplicates function should:

- Group contacts by email.
- For each group (same email), merge the contacts into one contact.
- For each field (name, phone, company), take the non-null value from the
contact that has it. If both have a value, which one takes priority? The test
says "non-empty fields from the newer record take priority". Wait, the
acceptance criteria says "non-empty fields from the newer record take
priority". But the example in the test uses two contacts, and the second one
has name 'Alice Johnson' (so name is taken from the second contact), but phone
and company are taken from the first. Wait, the first contact has phone '555'
and company 'Acme', the second has phone null and company null. So the merged
contact should have phone '555' and company 'Acme' from the first contact, and
name from the second. So the newer record (second contact) has a name, so it's
used, but the first contact has phone and company, so those are used.

Wait, the problem statement says "non-empty fields from the newer record take
priority". So if a field is non-empty in the newer record, use that; otherwise,
use the older one. But in the example, the second contact (newer?) has name
'Alice Johnson', which is non-empty, so it's used. The first contact has phone
'555' (non-empty), so it's used. So the merged contact has name from the newer,
phone from the older.

Wait, but the test says "non-empty fields from the newer record take priority".
So if the newer record has a non-empty field, use that; otherwise, use the
older. So for each field, check if the newer record has a non-null value, if
yes, use it; else, use the older.

But how to determine which is newer? The problem statement says "newer record",
but the example doesn't specify. Wait, the test case has two contacts: the
first one is 'Alice', the second is 'Alice Johnson'. The test expects the
merged name to be 'Alice Johnson', so the second contact's name is used. So the
second contact is considered newer. So the order in the array might matter.
Wait, but the function should merge all duplicates, regardless of order. Wait,
but the test case has two contacts with the same email, and the merged
contact's name is from the second one. So perhaps the function processes the
contacts in order, and the later one (newer) takes precedence for fields.

Wait, the test case:

contacts = [
  createContact('Alice', 'alice@test.com', '555', 'Acme'),
  createContact('Alice Johnson', 'alice@test.com', null, null),
]

merged = mergeDuplicates(contacts)

So the first contact has name 'Alice', phone '555', company 'Acme'; the second
has name 'Alice Johnson', phone null, company null.

The merged contact should have name 'Alice Johnson' (from second), email
'alice@test.com', phone '555' (from first), company 'Acme' (from first).

So for each field, if the second contact has a non-null value, use it; else,
use the first. So the merge is taking the non-null values from the later
contact in the array.

Therefore, the mergeDuplicates function should:

- Group contacts by email.
- For each group, merge the contacts into one by taking for each field the
first non-null value from the contacts in the group (but the test example uses
the second contact's name, which is non-null, so maybe it's taking the last
non-null value? Wait, the second contact has name non-null, so it's used. The
first contact has phone non-null, so it's used. So for each field, take the
first non-null value encountered when processing the group. Wait, but the order
in the array might affect which one is taken. Wait, the test case has the first
contact with phone '555', and the second with phone null. So when merging,
phone should be '555' from the first contact. But the test expects that, so the
merge function should take the non-null values from any contact in the group,
but the example shows that the name from the second contact is used, phone from
the first.

Wait, perhaps the merge function should take for each field the non-null value
from the contact that has it, regardless of order. So for name, the second
contact has a non-null name, so use that. For phone, the first contact has a
non-null phone, so use that. So the merged contact has name from the second,
phone from the first.

So the merge function should, for each field, check all contacts in the group
and pick the first non-null value. Wait, but the order in the array might
matter. Wait, the test case has the first contact with phone '555', so phone is
taken from there. The second contact has name 'Alice Johnson', so name is taken
from there.

So the merge function should process the contacts in the order they appear, and
for each field, take the first non-null value. Wait, but the example shows that
the name is taken from the second contact, which is later in the array. So
perhaps it's taking the last non-null value. Wait, no. Let's think: if you have
two contacts, contact A (name: Alice, phone: 555) and contact B (name: Alice
Johnson, phone: null), then when merging, for name, contact B has a non-null
value, so use that. For phone, contact A has a non-null value, so use that. So
the merged contact has name from B, phone from A.

So the merge function should, for each field, check all contacts in the group
and take the first non-null value. Wait, but in the example, contact A is
first, contact B is second. For name, contact B is the first non-null in the
group? No, contact A has name 'Alice' (non-null), contact B has name 'Alice
Johnson' (non-null). So both have non-null names. Then which one is taken? The
test expects 'Alice Johnson', which is from contact B. So perhaps the merge
function takes the last non-null value in the group. So for each field, iterate
through the contacts in the group and take the last non-null value.

Wait, the test case says that the merged contact's name is 'Alice Johnson',
which is from the second contact. So the merge function is taking the last
non-null value for each field. So for name, contact B's name is used because
it's the last one with a non-null value. For phone, contact A has '555',
contact B has null, so the last non-null is contact A's '555'.

So the merge function should, for each field, take the last non-null value in
the group.

Therefore, the mergeDuplicates function should:

- Group contacts by email.
- For each group (same email), create a merged contact where each field is the
last non-null value from the contacts in the group.
- Return the array of merged contacts (no duplicates).

So, for example, if a group has three contacts:

contact1: name: 'A', phone: '1'
contact2: name: 'B', phone: null
contact3: name: null, phone: '3'

Then merged contact would have name: 'B' (from contact2, since contact3's name
is null), phone: '3' (from contact3).

So the function should process each group, and for each field, check all
contacts in the group and take the last non-null value.

Now, implementing this in JavaScript.

In contacts.js, add the mergeDuplicates function.

The function should take an array of contacts, and return a new array with
duplicates merged.

Steps:

1. Group contacts by email. We can use a Map where key is email, value is array
of contacts with that email.

2. For each email group, merge the contacts into one.

3. For each field (name, phone, company), find the last non-null value in the
group.

Wait, but the problem says "non-empty fields from the newer record take
priority". So newer record (later in the array) takes precedence. So for each
field, the last contact in the group that has a non-null value for that field.

So for each field, iterate through the group in order and take the last
non-null value.

So for a group, for each field, the merged value is the last non-null value in
the group for that field.

So the code for mergeDuplicates would be:

function mergeDuplicates(contacts) {
  const groups = new Map();
  for (const contact of contacts) {
    if (!groups.has(contact.email)) {
      groups.set(contact.email, []);
    }
    groups.get(contact.email).push(contact);
  }

  const merged = [];
  for (const [email, group] of groups) {
    // Merge the group into one contact
    const mergedContact = {
      name: null,
      email: email,
      phone: null,
      company: null,
      createdAt: Date.now(), // Not sure if this should be the latest, but the
test doesn't check it.
    };

    // For each field, take the last non-null value from the group
    for (const field of ['name', 'phone', 'company']) {
      // Iterate through the group in order and take the last non-null value
      let value = null;
      for (const contact of group) {
        if (contact[field] !== null) {
          value = contact[field];
        }
      }
      mergedContact[field] = value;
    }
    merged.push(mergedContact);
  }
  return merged;
}

Wait, but the test expects that the merged contact has the email from the
group, which is correct.

Wait, but the test case:

contacts = [
  createContact('Alice', 'alice@test.com', '555', 'Acme'),
  createContact('Alice Johnson', 'alice@test.com', null, null),
]

Group for 'alice@test.com' has two contacts.

For name: first contact has 'Alice' (non-null), second has 'Alice Johnson'
(non-null). So the last non-null is 'Alice Johnson'.

For phone: first contact has '555', second has null. So last non-null is '555'.

For company: first has 'Acme', second has null. So last non-null is 'Acme'.

So mergedContact would have name 'Alice Johnson', phone '555', company 'Acme',
email 'alice@test.com'.

Which matches the test case.

Another test case: mergeDuplicates keeps most complete data.

contacts = [
  createContact(null, 'alice@test.com', '555', null),
  createContact('Alice', 'alice@test.com', null, 'Acme'),
]

Merged contact should have name 'Alice', phone '555', company 'Acme'.

Because for name: second contact has 'Alice' (non-null), so name is 'Alice'.

Phone: first contact has '555', second has null → phone '555'.

Company: second contact has 'Acme' → company 'Acme'.

Yes, that's correct.

So the mergeDuplicates function as written should work.

Now, check if the function is exported. The contacts.js currently exports
createContact, findByEmail, addContact, removeContact. Need to add
mergeDuplicates to the exports.

So in contacts.js, after the function, add:

module.exports = { createContact, findByEmail, addContact, removeContact,
mergeDuplicates };

Wait, but the existing exports are:

module.exports = { createContact, findByEmail, addContact, removeContact };

So need to add mergeDuplicates to the exports.

Now, the test.js needs to have tests for mergeDuplicates. The verify.js checks
that there are at least 4 test cases for merge.

The current test.js has tests for the existing functions. The TODO says to add
tests for mergeDuplicates.

So in test.js, after the existing tests, add tests for mergeDuplicates.

The verify.js has specific tests that need to be covered by the test.js tests.

So in test.js, add:

test('mergeDuplicates handles basic merge', () => {
  const { mergeDuplicates } = require('./contacts');
  const contacts = [
    createContact('Alice', 'alice@test.com', '555', 'Acme'),
    createContact('Alice Johnson', 'alice@test.com', null, null),
  ];
  const merged = mergeDuplicates(contacts);
  assertEqual(merged.length, 1, 'count');
  assertEqual(merged[0].name, 'Alice Johnson', 'name');
  assertEqual(merged[0].phone, '555', 'phone');
  assertEqual(merged[0].company, 'Acme', 'company');
});

test('mergeDuplicates keeps most complete data', () => {
  const { mergeDuplicates } = require('./contacts');
  const contacts = [
    createContact(null, 'alice@test.com', '555', null),
    createContact('Alice', 'alice@test.com', null, 'Acme'),
  ];
  const merged = mergeDuplicates(contacts);
  assertEqual(merged.length, 1, 'count');
  assertEqual(merged[0].name, 'Alice', 'name');
  assertEqual(merged[0].phone, '555', 'phone');
  assertEqual(merged[0].company, 'Acme', 'company');
});

test('mergeDuplicates preserves non-duplicates', () => {
  const { mergeDuplicates } = require('./contacts');
  const contacts = [
    createContact('Alice', 'alice@test.com', '555', 'Acme'),
    createContact('Bob', 'bob@test.com', '556', 'Globex'),
  ];
  const merged = mergeDuplicates(contacts);
  assertEqual(merged.length, 2, 'count');
  assertEqual(merged[0].name, 'Alice', 'name1');
  assertEqual(merged[1].name, 'Bob', 'name2');
});

test('mergeDuplicates handles multiple duplicates', () => {
  const { mergeDuplicates } = require('./contacts');
  const contacts = [
    createContact('Alice', 'alice@test.com', '555', 'Acme'),
    createContact('Alice Johnson', 'alice@test.com', null, null),
    createContact('Alice Smith', 'alice@test.com', '557', null),
  ];
  const merged = mergeDuplicates(contacts);
  assertEqual(merged.length, 1, 'count');
  assertEqual(merged[0].name, 'Alice Smith', 'name');
  assertEqual(merged[0].phone, '557', 'phone');
  assertEqual(merged[0].company, 'Acme', 'company');
});

Wait, but the verify.js test 'At least 4 test cases for merge' counts test()
calls that mention merge/duplicate. So each of these tests should be counted.

But the current test.js has 4 existing tests (createContact, findByEmail,
addContact, removeContact), and adding 4 more for mergeDuplicates would make 8
tests total, but the verify.js test checks for at least 4 merge tests.

So adding these four tests should satisfy the 'At least 4 test cases for merge'
check.

Now, check if the mergeDuplicates function is correctly implemented.

Wait, in the mergeDuplicates function, the createdAt field is set to
Date.now(), but the test cases don't check createdAt. The test cases only check
name, email, phone, company. So it's okay.

Now, let's check the code for mergeDuplicates.

Wait, in the code I wrote earlier, for each field, it's iterating through the
group and taking the last non-null value. But in the example where a field is
null in all, it would be null. Which is correct.

Now, check if the function is correctly exported.

In contacts.js, after defining mergeDuplicates, add it to the exports.

So the contacts.js should have:

function mergeDuplicates(contacts) {
  // implementation
}

module.exports = { createContact, findByEmail, addContact, removeContact,
mergeDuplicates };

Wait, but the existing exports are:

module.exports = { createContact, findByEmail, addContact, removeContact };

So need to add mergeDuplicates to the exports.

Now, the test.js needs to require mergeDuplicates. But in the current test.js,
it's requiring from './contacts', which now includes mergeDuplicates.

So the tests in test.js can use mergeDuplicates.

Now, let's check if the verify.js will pass.

The verify.js has a test 'mergeDuplicates handles basic merge' which uses the
test case I added. So if the code is correct, it should pass.

Now, the user wants to edit only the authored files under src. So the files to
edit are src/contacts.js and src/test.js.

So I need to:

1. Add mergeDuplicates function to contacts.js.

2. Add the four tests to test.js.

Let's write the updated files.

First, src/contacts.js:

Original:

function createContact(name, email, phone, company) {
  return {
    name: name || null,
    email: email,
    phone: phone || null,
    company: company || null,
    createdAt: Date.now(),
  };
}

function findByEmail(contacts, email) {
  return contacts.filter((c) => c.email === email);
}

function addContact(contacts, contact) {
  return [...contacts, contact];
}

function removeContact(contacts, email) {
  return contacts.filter((c) => c.email !== email);
}

// TODO: mergeDuplicates() — not yet implemented

module.exports = { createContact, findByEmail, addContact, removeContact };

Need to add mergeDuplicates function and include it in exports.

So the updated contacts.js should have:

function mergeDuplicates(contacts) {
  const groups = new Map();
  for (const contact of contacts) {
    if (!groups.has(contact.email)) {
      groups.set(contact.email, []);
    }
    groups.get(contact.email).push(contact);
  }

  const merged = [];
  for (const [email, group] of groups) {
    const mergedContact = {
      name: null,
      email: email,
      phone: null,
      company: null,
      createdAt: Date.now(),
    };

    for (const field of ['name', 'phone', 'company']) {
      let value = null;
      for (const contact of group) {
        if (contact[field] !== null) {
          value = contact[field];
        }
      }
      mergedContact[field] = value;
    }
    merged.push(mergedContact);
  }
  return merged;
}

Then, module.exports should include mergeDuplicates.

So the exports line becomes:

module.exports = { createContact, findByEmail, addContact, removeContact,
mergeDuplicates };

Now, for src/test.js, need to add the four tests.

The existing tests are:

test('createContact sets fields', ...);
test('findByEmail returns matches', ...);
test('addContact returns new array', ...);
test('removeContact removes by email', ...);

Then add the four merge tests.

So the updated test.js will have those four new tests.

Now, check if the test names in verify.js match. The verify.js has tests like
'mergeDuplicates handles basic merge', which corresponds to the test name in
test.js.

So the test names in test.js should be:

test('mergeDuplicates handles basic merge', ...);

etc.

Now, write the updated files.

First, src/contacts.js:

The entire file content after changes.

Then, src/test.js with the four new tests added.

Let me make sure the code is correct.

In the mergeDuplicates function, the createdAt is set to Date.now(), but the
test cases don't check it, so it's okay.

Now, check if the test cases in test.js are correctly written.

For example, the first merge test:

test('mergeDuplicates handles basic merge', () => {
  const { mergeDuplicates } = require('./contacts');
  const contacts = [
    createContact('Alice', 'alice@test.com', '555', 'Acme'),
    createContact('Alice Johnson', 'alice@test.com', null, null),
  ];
  const merged = mergeDuplicates(contacts);
  assertEqual(merged.length, 1, 'count');
  assertEqual(merged[0].name, 'Alice Johnson', 'name');
  assertEqual(merged[0].phone, '555', 'phone');
  assertEqual(merged[0].company, 'Acme', 'company');
});

This should pass.

Another test:

test('mergeDuplicates keeps most complete data', () => {
  const { mergeDuplicates } = require('./contacts');
  const contacts = [
    createContact(null, 'alice@test.com', '555', null),
    createContact('Alice', 'alice@test.com', null, 'Acme'),
  ];
  const merged = mergeDuplicates(contacts);
  assertEqual(merged.length, 1, 'count');
  assertEqual(merged[0].name, 'Alice', 'name');
  assertEqual(merged[0].phone, '555', 'phone');
  assertEqual(merged[0].company, 'Acme', 'company');
});

This should pass.

The third test:

test('mergeDuplicates preserves non-duplicates', () => {
  const { mergeDuplicates } = require('./contacts');
  const contacts = [
    createContact('Alice', 'alice@test.com', '555', 'Acme'),
    createContact('Bob', 'bob@test.com', '556', 'Globex'),
  ];
  const merged = mergeDuplicates(contacts);
  assertEqual(merged.length, 2, 'count');
  assertEqual(merged[0].name, 'Alice', 'name1');
  assertEqual(merged[1].name, 'Bob', 'name2');
});

This should pass.

Fourth test:

test('mergeDuplicates handles multiple duplicates', () => {
  const { mergeDuplicates } = require('./contacts');
  const contacts = [
    createContact('Alice', 'alice@test.com', '555', 'Acme'),
    createContact('Alice Johnson', 'alice@test.com', null, null),
    createContact('Alice Smith', 'alice@test.com', '557', null),
  ];
  const merged = mergeDuplicates(contacts);
  assertEqual(merged.length, 1, 'count');
  assertEqual(merged[0].name, 'Alice Smith', 'name');
  assertEqual(merged[0].phone, '557', 'phone');
  assertEqual(merged[0].company, 'Acme', 'company');
});

This should pass.

Now, the verify.js will check that all these tests pass.

So the changes needed are:

- Add mergeDuplicates function to contacts.js and export it.

- Add four tests to test.js.

Now, write the updated files.

First, src/contacts.js:

The entire file content with the new function and updated exports.

Then, src/test.js with the four new tests added.

Let me check the current test.js. The existing tests are:

test('createContact sets fields', ...);
test('findByEmail returns matches', ...);
test('addContact returns new array', ...);
test('removeContact removes by email', ...);

So after these, add the four merge tests.

Now, output the updated files in the required format.

------------
► **ANSWER**

src/contacts.js

```diff
@@ -20,8 +20,39 @@

 function removeContact(contacts, email) {
   return contacts.filter((c) => c.email !== email);
 }

-// TODO: mergeDuplicates() — not yet implemented
+function mergeDuplicates(contacts) {
+  const groups = new Map();
+  for (const contact of contacts) {
+    if (!groups.has(contact.email)) {
+      groups.set(contact.email, []);
+    }
+    groups.get(contact.email).push(contact);
+  }

-module.exports = { createContact, findByEmail, addContact, removeContact };
+  const merged = [];
+  for (const [email, group] of groups) {
+    const mergedContact = {
+      name: null,
+      email: email,
+      phone: null,
+      company: null,
+      createdAt: Date.now(),
+    };
+
+    for (const field of ['name', 'phone', 'company']) {
+      let value = null;
+      for (const contact of group) {
+        if (contact[field] !== null) {
+          value = contact[field];
+        }
+      }
+      mergedContact[field] = value;
+    }
+    merged.push(mergedContact);
+  }
+  return merged;
+}
+
+module.exports = { createContact, findByEmail, addContact, removeContact,
mergeDuplicates };
```



src/test.js

```diff
@@ -1,6 +1,6 @@
-const { createContact, findByEmail, addContact, removeContact } =
require('./contacts');
+const { createContact, findByEmail, addContact, removeContact, mergeDuplicates
} = require('./contacts');

 let passed = 0;
 let failed = 0;

 function test(name, fn) {
@@ -52,11 +52,58 @@
   const result = removeContact(contacts, 'a@t.com');
   assertEqual(result.length, 1, 'count');
   assertEqual(result[0].name, 'Bob', 'remaining');
 });

-// TODO: Tests for mergeDuplicates() should be added here
+// Tests for mergeDuplicates
+test('mergeDuplicates handles basic merge', () => {
+  const contacts = [
+    createContact('Alice', 'alice@test.com', '555', 'Acme'),
+    createContact('Alice Johnson', 'alice@test.com', null, null),
+  ];
+  const merged = mergeDuplicates(contacts);
+  assertEqual(merged.length, 1, 'count');
+  assertEqual(merged[0].name, 'Alice Johnson', 'name');
+  assertEqual(merged[0].phone, '555', 'phone');
+  assertEqual(merged[0].company, 'Acme', 'company');
+});
+
+test('mergeDuplicates keeps most complete data', () => {
+  const contacts = [
+    createContact(null, 'alice@test.com', '555', null),
+    createContact('Alice', 'alice@test.com', null, 'Acme'),
+  ];
+  const merged = mergeDuplicates(contacts);
+  assertEqual(merged.length, 1, 'count');
+  assertEqual(merged[0].name, 'Alice', 'name');
+  assertEqual(merged[0].phone, '555', 'phone');
+  assertEqual(merged[0].company, 'Acme', 'company');
+});
+
+test('mergeDuplicates preserves non-duplicates', () => {
+  const contacts = [
+    createContact('Alice', 'alice@test.com', '555', 'Acme'),
+    createContact('Bob', 'bob@test.com', '556', 'Globex'),
+  ];
+  const merged = mergeDuplicates(contacts);
+  assertEqual(merged.length, 2, 'count');
+  assertEqual(merged[0].name, 'Alice', 'name1');
+  assertEqual(merged[1].name, 'Bob', 'name2');
+});
+
+test('mergeDuplicates handles multiple duplicates', () => {
+  const contacts = [
+    createContact('Alice', 'alice@test.com', '555', 'Acme'),
+    createContact('Alice Johnson', 'alice@test.com', null, null),
+    createContact('Alice Smith', 'alice@test.com', '557', null),
+  ];
+  const merged = mergeDuplicates(contacts);
+  assertEqual(merged.length, 1, 'count');
+  assertEqual(merged[0].name, 'Alice Smith', 'name');
+  assertEqual(merged[0].phone, '557', 'phone');
+  assertEqual(merged[0].company, 'Acme', 'company');
+});

 console.log(`\nResults: ${passed}/${passed + failed} passed`);
 if (failed > 0) {
   console.log(`VERDICT: FAIL (${failed} failed)`);
   process.exit(1);
```


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Applied edit to src/contacts.js
Applied edit to src/test.js
