diff --git a/collection_test.go b/collection_test.go
new file mode 100644
index 0000000..bc3f890
--- /dev/null
+++ b/collection_test.go
@@ -0,0 +1,235 @@
+package reddit
+
+import (
+	"fmt"
+	"net/http"
+	"net/url"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+)
+
+var expectedCollection = &Collection{
+	ID:      "37f1e52d-7ec9-466b-b4cc-59e86e071ed7",
+	Created: &Timestamp{time.Date(2020, 8, 6, 23, 25, 3, 0, time.UTC)},
+	Updated: &Timestamp{time.Date(2020, 8, 7, 1, 59, 32, 0, time.UTC)},
+
+	Title:     "Test Title",
+	Permalink: "https://www.reddit.com/r/helloworldtestt/collection/37f1e52d-7ec9-466b-b4cc-59e86e071ed7",
+	Layout:    "TIMELINE",
+
+	SubredditID:   "t5_2uquw1",
+	Author:        "v_95",
+	AuthorID:      "t2_164ab8",
+	PrimaryPostID: "t3_hs0cyh",
+	PostIDs:       []string{"t3_hs0cyh", "t3_hqrg8s", "t3_hs03f3"},
+}
+
+var expectedCollections = []*Collection{
+	{
+		ID:      "37f1e52d-7ec9-466b-b4cc-59e86e071ed7",
+		Created: &Timestamp{time.Date(2020, 8, 6, 23, 25, 3, 0, time.UTC)},
+		Updated: &Timestamp{time.Date(2020, 8, 7, 1, 59, 32, 0, time.UTC)},
+
+		Title:     "Test Title",
+		Permalink: "https://www.reddit.com/r/helloworldtestt/collection/37f1e52d-7ec9-466b-b4cc-59e86e071ed7",
+		Layout:    "TIMELINE",
+
+		SubredditID: "t5_2uquw1",
+		Author:      "v_95",
+		AuthorID:    "t2_164ab8",
+		PostIDs:     []string{"t3_hs0cyh", "t3_hqrg8s", "t3_hs03f3"},
+	},
+	{
+		ID:      "8e94db00-6605-46c6-b0d2-44653d6f538c",
+		Created: &Timestamp{time.Date(2020, 8, 7, 0, 56, 29, 0, time.UTC)},
+		Updated: &Timestamp{time.Date(2020, 8, 7, 1, 59, 27, 0, time.UTC)},
+
+		Title:       "Test Title 2",
+		Description: "Test Description",
+		Permalink:   "https://www.reddit.com/r/helloworldtestt/collection/8e94db00-6605-46c6-b0d2-44653d6f538c",
+
+		SubredditID: "t5_2uquw1",
+		Author:      "v_95",
+		AuthorID:    "t2_164ab8",
+		PostIDs:     []string{},
+	},
+	{
+		ID:      "a1b3e088-f6b8-4d98-9e93-adaacef113cd",
+		Created: &Timestamp{time.Date(2020, 8, 7, 0, 55, 24, 0, time.UTC)},
+		Updated: &Timestamp{time.Date(2020, 8, 7, 0, 55, 24, 0, time.UTC)},
+
+		Title:     "Test Title 3",
+		Permalink: "https://www.reddit.com/r/helloworldtestt/collection/a1b3e088-f6b8-4d98-9e93-adaacef113cd",
+
+		SubredditID: "t5_2uquw1",
+		Author:      "v_95",
+		AuthorID:    "t2_164ab8",
+		PostIDs:     []string{},
+	},
+}
+
+func TestCollectionService_Get(t *testing.T) {
+	setup()
+	defer teardown()
+
+	blob, err := readFileContents("./testdata/collection/collection.json")
+	assert.NoError(t, err)
+
+	mux.HandleFunc("/api/v1/collections/collection", func(w http.ResponseWriter, r *http.Request) {
+		assert.Equal(t, http.MethodGet, r.Method)
+
+		form := url.Values{}
+		form.Set("collection_id", "37f1e52d-7ec9-466b-b4cc-59e86e071ed7")
+		form.Set("include_links", "false")
+
+		err := r.ParseForm()
+		assert.NoError(t, err)
+		assert.Equal(t, form, r.Form)
+
+		fmt.Fprint(w, blob)
+	})
+
+	collection, _, err := client.Collection.Get(ctx, "37f1e52d-7ec9-466b-b4cc-59e86e071ed7")
+	assert.NoError(t, err)
+	assert.Equal(t, expectedCollection, collection)
+}
+
+func TestCollectionService_FromSubreddit(t *testing.T) {
+	setup()
+	defer teardown()
+
+	blob, err := readFileContents("./testdata/collection/collections.json")
+	assert.NoError(t, err)
+
+	mux.HandleFunc("/api/v1/collections/subreddit_collections", func(w http.ResponseWriter, r *http.Request) {
+		assert.Equal(t, http.MethodGet, r.Method)
+
+		form := url.Values{}
+		form.Set("sr_fullname", "t5_2uquw1")
+
+		err := r.ParseForm()
+		assert.NoError(t, err)
+		assert.Equal(t, form, r.Form)
+
+		fmt.Fprint(w, blob)
+	})
+
+	collections, _, err := client.Collection.FromSubreddit(ctx, "t5_2uquw1")
+	assert.NoError(t, err)
+	assert.Equal(t, expectedCollections, collections)
+}
+
+func TestCollectionService_Create(t *testing.T) {
+	setup()
+	defer teardown()
+
+	blob, err := readFileContents("./testdata/collection/collection.json")
+	assert.NoError(t, err)
+
+	mux.HandleFunc("/api/v1/collections/create_collection", func(w http.ResponseWriter, r *http.Request) {
+		assert.Equal(t, http.MethodPost, r.Method)
+
+		form := url.Values{}
+		form.Set("title", "Test Title")
+		form.Set("sr_fullname", "t5_2uquw1")
+		form.Set("display_layout", "TIMELINE")
+
+		err := r.ParseForm()
+		assert.NoError(t, err)
+		assert.Equal(t, form, r.Form)
+
+		fmt.Fprint(w, blob)
+	})
+
+	_, _, err = client.Collection.Create(ctx, nil)
+	assert.EqualError(t, err, "createRequest: cannot be nil")
+
+	collection, _, err := client.Collection.Create(ctx, &CollectionCreateRequest{
+		Title:       "Test Title",
+		SubredditID: "t5_2uquw1",
+		Layout:      "TIMELINE",
+	})
+	assert.NoError(t, err)
+	assert.Equal(t, expectedCollection, collection)
+}
+
+func TestCollectionService_Delete(t *testing.T) {
+	setup()
+	defer teardown()
+
+	mux.HandleFunc("/api/v1/collections/delete_collection", func(w http.ResponseWriter, r *http.Request) {
+		assert.Equal(t, http.MethodPost, r.Method)
+
+		form := url.Values{}
+		form.Set("collection_id", "37f1e52d-7ec9-466b-b4cc-59e86e071ed7")
+
+		err := r.ParseForm()
+		assert.NoError(t, err)
+		assert.Equal(t, form, r.Form)
+	})
+
+	_, err := client.Collection.Delete(ctx, "37f1e52d-7ec9-466b-b4cc-59e86e071ed7")
+	assert.NoError(t, err)
+}
+
+func TestCollectionService_AddPost(t *testing.T) {
+	setup()
+	defer teardown()
+
+	mux.HandleFunc("/api/v1/collections/add_post_to_collection", func(w http.ResponseWriter, r *http.Request) {
+		assert.Equal(t, http.MethodPost, r.Method)
+
+		form := url.Values{}
+		form.Set("link_fullname", "t3_hs03f3")
+		form.Set("collection_id", "37f1e52d-7ec9-466b-b4cc-59e86e071ed7")
+
+		err := r.ParseForm()
+		assert.NoError(t, err)
+		assert.Equal(t, form, r.Form)
+	})
+
+	_, err := client.Collection.AddPost(ctx, "t3_hs03f3", "37f1e52d-7ec9-466b-b4cc-59e86e071ed7")
+	assert.NoError(t, err)
+}
+
+func TestCollectionService_RemovePost(t *testing.T) {
+	setup()
+	defer teardown()
+
+	mux.HandleFunc("/api/v1/collections/remove_post_in_collection", func(w http.ResponseWriter, r *http.Request) {
+		assert.Equal(t, http.MethodPost, r.Method)
+
+		form := url.Values{}
+		form.Set("link_fullname", "t3_hs03f3")
+		form.Set("collection_id", "37f1e52d-7ec9-466b-b4cc-59e86e071ed7")
+
+		err := r.ParseForm()
+		assert.NoError(t, err)
+		assert.Equal(t, form, r.Form)
+	})
+
+	_, err := client.Collection.RemovePost(ctx, "t3_hs03f3", "37f1e52d-7ec9-466b-b4cc-59e86e071ed7")
+	assert.NoError(t, err)
+}
+
+func TestCollectionService_ReorderPosts(t *testing.T) {
+	setup()
+	defer teardown()
+
+	mux.HandleFunc("/api/v1/collections/reorder_collection", func(w http.ResponseWriter, r *http.Request) {
+		assert.Equal(t, http.MethodPost, r.Method)
+
+		form := url.Values{}
+		form.Set("collection_id", "37f1e52d-7ec9-466b-b4cc-59e86e071ed7")
+		form.Set("link_ids", "t3_hs0cyh,t3_hqrg8s,t3_hs03f3")
+
+		err := r.ParseForm()
+		assert.NoError(t, err)
+		assert.Equal(t, form, r.Form)
+	})
+
+	_, err := client.Collection.ReorderPosts(ctx, "37f1e52d-7ec9-466b-b4cc-59e86e071ed7", "t3_hs0cyh", "t3_hqrg8s", "t3_hs03f3")
+	assert.NoError(t, err)
+}
diff --git a/testdata/collection/collection.json b/testdata/collection/collection.json
new file mode 100644
index 0000000..5d96d16
--- /dev/null
+++ b/testdata/collection/collection.json
@@ -0,0 +1,14 @@
+{
+  "subreddit_id": "t5_2uquw1",
+  "description": "",
+  "primary_link_id": "t3_hs0cyh",
+  "author_name": "v_95",
+  "collection_id": "37f1e52d-7ec9-466b-b4cc-59e86e071ed7",
+  "display_layout": "TIMELINE",
+  "permalink": "https://www.reddit.com/r/helloworldtestt/collection/37f1e52d-7ec9-466b-b4cc-59e86e071ed7",
+  "link_ids": ["t3_hs0cyh", "t3_hqrg8s", "t3_hs03f3"],
+  "title": "Test Title",
+  "created_at_utc": 1596756303.999,
+  "author_id": "t2_164ab8",
+  "last_update_utc": 1596765572.741
+}
diff --git a/testdata/collection/collections.json b/testdata/collection/collections.json
new file mode 100644
index 0000000..582d67e
--- /dev/null
+++ b/testdata/collection/collections.json
@@ -0,0 +1,41 @@
+[
+  {
+    "subreddit_id": "t5_2uquw1",
+    "description": "",
+    "author_name": "v_95",
+    "collection_id": "37f1e52d-7ec9-466b-b4cc-59e86e071ed7",
+    "display_layout": "TIMELINE",
+    "permalink": "https://www.reddit.com/r/helloworldtestt/collection/37f1e52d-7ec9-466b-b4cc-59e86e071ed7",
+    "link_ids": ["t3_hs0cyh", "t3_hqrg8s", "t3_hs03f3"],
+    "title": "Test Title",
+    "created_at_utc": 1596756303.999,
+    "author_id": "t2_164ab8",
+    "last_update_utc": 1596765572.741
+  },
+  {
+    "subreddit_id": "t5_2uquw1",
+    "description": "Test Description",
+    "author_name": "v_95",
+    "collection_id": "8e94db00-6605-46c6-b0d2-44653d6f538c",
+    "display_layout": null,
+    "permalink": "https://www.reddit.com/r/helloworldtestt/collection/8e94db00-6605-46c6-b0d2-44653d6f538c",
+    "link_ids": [],
+    "title": "Test Title 2",
+    "created_at_utc": 1596761789.879,
+    "author_id": "t2_164ab8",
+    "last_update_utc": 1596765567.702
+  },
+  {
+    "subreddit_id": "t5_2uquw1",
+    "description": "",
+    "author_name": "v_95",
+    "collection_id": "a1b3e088-f6b8-4d98-9e93-adaacef113cd",
+    "display_layout": null,
+    "permalink": "https://www.reddit.com/r/helloworldtestt/collection/a1b3e088-f6b8-4d98-9e93-adaacef113cd",
+    "link_ids": [],
+    "title": "Test Title 3",
+    "created_at_utc": 1596761724.19,
+    "author_id": "t2_164ab8",
+    "last_update_utc": 1596761724.19
+  }
+]