diff --git a/functions/databases/postgres/verify.js b/functions/databases/postgres/verify.js
index 8dc374a..e73e038 100644
--- a/functions/databases/postgres/verify.js
+++ b/functions/databases/postgres/verify.js
@@ -1,15 +1,40 @@
-module.exports = function(userID, phone) {
+module.exports = function(userID, code) {
+  const { client, pgConnect } = this;
   return new Promise((resolve, reject) => {
-    this.pgConnect()
+    pgConnect()
       .then(({ database, done }) => {
-        // pgClient.query... blah blah logic
-        //invoke done before your resolve this promise
-        done();
+        //Query to just check if the user was created
+        const query = "SELECT userid FROM twoauthusers WHERE userid=$1";
+        const values = [String(userID)];
+
+        database.query(query, values).then(res => {
+          const { sid, phone } = res.rows[0];
+
+          if (!sid)
+            reject(new Error("SID Error: No SID exists for this user."));
+          if (!phone)
+            reject(
+              new Error(
+                "Phone Number Error: No phone number exists for this user."
+              )
+            );
+
+          return this.client.verify
+            .services(sid)
+            .verificationChecks.create({
+              to: phone,
+              code
+            })
+            .then(verification => {
+              if (verification.status === "approved") resolve(true);
+              resolve(false);
+            });
+        });
       })
-      .catch((err, done) => {
-        //invoke done before you reject
+      .catch(err => {
         done();
-        reject(err);
+        reject(new Error("Could not find Database at Connection URI."));
       });
   });
+  //invoke done before you reject
 };
diff --git a/tests/tests-list.js b/tests/tests-list.js
new file mode 100644
index 0000000..67bd4e3
--- /dev/null
+++ b/tests/tests-list.js
@@ -0,0 +1,113 @@
+// Here we will be unit testing the 3 main database functions from server/db/markets.js
+const fs = require('fs');
+const path = require('path');
+const db = require('../server/db/markets.js');
+
+const testJsonFile = path.resolve(__dirname, '../server/db/markets.test.json');
+
+/**
+ * Like many testing frameworks, in Jest we use the "describe" function to
+ * separate our tests into sections. They make your test outputs readable.
+ *
+ * You can place "beforeAll", "beforeEach", "afterAll", and "afterEach"
+ * functions inside of "describe" blocks and they will only run for tests
+ * inside that describe block. You can even nest describes within describes!
+ */
+describe('db unit tests', () => {
+  /**
+   * Jest runs the "beforeAll" function once, before any tests are executed.
+   * Here, we write to the file and then reset our database model. Then, we
+   * invoke the "done" callback to tell Jest our async operations have
+   * completed. This way, the tests won't start until the "database" has been
+   * reset to an empty Array!
+   */
+  beforeAll((done) => {
+    fs.writeFile(testJsonFile, JSON.stringify([]), () => {
+      db.reset();
+      done();
+    });
+  });
+
+  afterAll((done) => {
+    fs.writeFile(testJsonFile, JSON.stringify([]), done);
+  });
+
+  describe('#sync', () => {
+    it('writes a valid marketList to the JSON file', () => {
+      const marketList = [{ location: 'here', cards: 11 }, { location: 'there', cards: 0 }];
+      const result = db.sync(marketList);
+      expect(result).not.toBeInstanceOf(Error);
+      const table = JSON.parse(fs.readFileSync(testJsonFile));
+      expect(table).toEqual(marketList);
+    });
+
+    // TODO: Finish unit testing the sync function
+
+    it('overwrites previously existing markets', () => {
+      // if we pass an empty array than we expect length 0
+      const result = db.sync([
+        { location: 'Australia',
+          cards: 32
+        }
+      ]);
+ 
+      expect(result.length).toBe(1);
+    });
+
+    it('returns an error when location and/or cards fields are not provided', () => {
+
+      const result = db.sync([
+        { location: 'Australia',
+          cards: 32
+        }
+      ]);
+      // // expect(result[0].location).toBeDefined()
+        expect(result[0].location).toBeDefined()
+        expect(result[0].cards).toBeDefined()
+    });
+
+    /**
+     *  TODO: Type validation is not yet correctly implemented! Follow the TDD
+     *  (test driven development) approach:
+     *    1. Write a tes[t describing the desired feature (db.sync returns a
+     *      TypeError when the types are wrong)
+     *    2. Confirm that your tests fail
+     *    3. Follow the errors to implement your new functionality
+     */
+    it('returns an error when location value is not a string', () => {
+
+      const result = db.sync([
+        { location: 'Australia',
+          cards: 32
+        }
+      ]);
+
+      expect(typeof result[0].location).toBe('string')
+    });
+
+    it('returns an error when cards value is not a number', () => {
+
+      const result = db.sync([
+        { location: 'Australia',
+          cards: 32
+        }
+      ]);
+
+      expect(typeof result[0].cards).toBe('number')
+    });
+  });
+
+  // Extension TODO: Unit test the #find and #drop functions
+  describe('#find', () => {
+    xit('returns list of all markets from the json file', () => {
+    });
+
+    xit('works if the list of markets is empty', () => {
+    });
+  });
+
+  describe('#drop', () => {
+    xit('writes an empty array to the json file', () => {
+    });
+  });
+});