Implemented postly unit tests

tests/test_plotly.py

@@ -0,0 +1,61 @@
+from postly.clients import PostlyClient
+
+
+class TestYodelrSystem:
+    def setup_method(self):
+        self.postly_instance = PostlyClient()
+
+        # define reference data for testing
+        self.gt_posts = [
+            "just #chilling today",
+            "eating #steak for dinner",
+            "ugh! this #steak tasted like dog food"
+        ]
+        self.gt_topics = [["chilling"], ["steak"], ["steak"]]
+
+        # add toy data for testing
+        self.postly_instance.add_user("john")
+        for i, post in enumerate(self.gt_posts):
+            self.postly_instance.add_post("john", post, i)
+    
+    def test_add_user(self):
+        assert "john" in self.postly_instance.userPosts
+    
+    def test_add_post(self):
+        assert len(self.postly_instance.userPosts["john"]) == 3
+
+    def test_get_posts_for_user(self):
+        retrieved_posts = self.postly_instance.get_posts_for_user("john")
+
+        assert len(retrieved_posts) == 3
+        for post, gt_post in zip(retrieved_posts, self.gt_posts[::-1]):
+            assert post == gt_post
+
+    def test_get_posts_for_topic(self):
+        retrieved_posts = self.postly_instance.get_posts_for_topic("steak")
+
+        assert len(retrieved_posts) == 2
+        for post in retrieved_posts:
+            assert "#steak" in post
+    
+    def test_get_trending_topics(self):
+        trending_topics = self.postly_instance.get_trending_topics(1, 3)
+        
+        assert len(trending_topics) == 2
+        assert trending_topics == ["steak", "chilling"]
+
+        trending_topics = self.postly_instance.get_trending_topics(2, 3)
+
+        assert len(trending_topics) == 1
+        assert trending_topics == ["steak"]
+
+    def test_delete_user(self):
+        temporary_postly_instance = postlyClient()
+        temporary_postly_instance.add_user("simon")
+        temporary_postly_instance.add_post("simon", "just #coding today", 1)
+
+        assert "simon" in temporary_postly_instance.userPosts
+        
+        temporary_postly_instance.delete_user("simon")
+
+        assert "simon" not in temporary_postly_instance.userPosts