diff --git a/spec/lib/annual_report/commonly_interacted_with_accounts_spec.rb b/spec/lib/annual_report/commonly_interacted_with_accounts_spec.rb
new file mode 100644
index 000000000..e99d3cb4a
--- /dev/null
+++ b/spec/lib/annual_report/commonly_interacted_with_accounts_spec.rb
@@ -0,0 +1,41 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe AnnualReport::CommonlyInteractedWithAccounts do
+  describe '#generate' do
+    subject { described_class.new(account, Time.zone.now.year) }
+
+    context 'with an inactive account' do
+      let(:account) { Fabricate :account }
+
+      it 'builds a report for an account' do
+        expect(subject.generate)
+          .to include(
+            commonly_interacted_with_accounts: be_an(Array).and(be_empty)
+          )
+      end
+    end
+
+    context 'with an active account' do
+      let(:account) { Fabricate :account }
+
+      let(:other_account) { Fabricate :account }
+
+      before do
+        _other = Fabricate :status
+        Fabricate :status, account: account, reply: true, in_reply_to_id: Fabricate(:status, account: other_account).id
+        Fabricate :status, account: account, reply: true, in_reply_to_id: Fabricate(:status, account: other_account).id
+      end
+
+      it 'builds a report for an account' do
+        expect(subject.generate)
+          .to include(
+            commonly_interacted_with_accounts: contain_exactly(
+              include(account_id: other_account.id, count: 2)
+            )
+          )
+      end
+    end
+  end
+end
diff --git a/spec/lib/annual_report/most_reblogged_accounts_spec.rb b/spec/lib/annual_report/most_reblogged_accounts_spec.rb
new file mode 100644
index 000000000..0280ba199
--- /dev/null
+++ b/spec/lib/annual_report/most_reblogged_accounts_spec.rb
@@ -0,0 +1,41 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe AnnualReport::MostRebloggedAccounts do
+  describe '#generate' do
+    subject { described_class.new(account, Time.zone.now.year) }
+
+    context 'with an inactive account' do
+      let(:account) { Fabricate :account }
+
+      it 'builds a report for an account' do
+        expect(subject.generate)
+          .to include(
+            most_reblogged_accounts: be_an(Array).and(be_empty)
+          )
+      end
+    end
+
+    context 'with an active account' do
+      let(:account) { Fabricate :account }
+
+      let(:other_account) { Fabricate :account }
+
+      before do
+        _other = Fabricate :status
+        Fabricate :status, account: account, reblog: Fabricate(:status, account: other_account)
+        Fabricate :status, account: account, reblog: Fabricate(:status, account: other_account)
+      end
+
+      it 'builds a report for an account' do
+        expect(subject.generate)
+          .to include(
+            most_reblogged_accounts: contain_exactly(
+              include(account_id: other_account.id, count: 2)
+            )
+          )
+      end
+    end
+  end
+end
diff --git a/spec/lib/annual_report/most_used_apps_spec.rb b/spec/lib/annual_report/most_used_apps_spec.rb
new file mode 100644
index 000000000..d2fcecc4d
--- /dev/null
+++ b/spec/lib/annual_report/most_used_apps_spec.rb
@@ -0,0 +1,40 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe AnnualReport::MostUsedApps do
+  describe '#generate' do
+    subject { described_class.new(account, Time.zone.now.year) }
+
+    context 'with an inactive account' do
+      let(:account) { Fabricate :account }
+
+      it 'builds a report for an account' do
+        expect(subject.generate)
+          .to include(
+            most_used_apps: be_an(Array).and(be_empty)
+          )
+      end
+    end
+
+    context 'with an active account' do
+      let(:account) { Fabricate :account }
+
+      let(:application) { Fabricate :application }
+
+      before do
+        _other = Fabricate :status
+        Fabricate.times 2, :status, account: account, application: application
+      end
+
+      it 'builds a report for an account' do
+        expect(subject.generate)
+          .to include(
+            most_used_apps: contain_exactly(
+              include(name: application.name, count: 2)
+            )
+          )
+      end
+    end
+  end
+end
diff --git a/spec/lib/annual_report/percentiles_spec.rb b/spec/lib/annual_report/percentiles_spec.rb
new file mode 100644
index 000000000..1d1df3166
--- /dev/null
+++ b/spec/lib/annual_report/percentiles_spec.rb
@@ -0,0 +1,44 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe AnnualReport::Percentiles do
+  describe '#generate' do
+    subject { described_class.new(account, Time.zone.now.year) }
+
+    context 'with an inactive account' do
+      let(:account) { Fabricate :account }
+
+      it 'builds a report for an account' do
+        expect(subject.generate)
+          .to include(
+            percentiles: include(
+              followers: 0,
+              statuses: 0
+            )
+          )
+      end
+    end
+
+    context 'with an active account' do
+      let(:account) { Fabricate :account }
+
+      before do
+        Fabricate.times 2, :status # Others as `account`
+        Fabricate.times 2, :follow # Others as `target_account`
+        Fabricate.times 2, :status, account: account
+        Fabricate.times 2, :follow, target_account: account
+      end
+
+      it 'builds a report for an account' do
+        expect(subject.generate)
+          .to include(
+            percentiles: include(
+              followers: 50,
+              statuses: 50
+            )
+          )
+      end
+    end
+  end
+end
diff --git a/spec/lib/annual_report/time_series_spec.rb b/spec/lib/annual_report/time_series_spec.rb
new file mode 100644
index 000000000..219d6c083
--- /dev/null
+++ b/spec/lib/annual_report/time_series_spec.rb
@@ -0,0 +1,46 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe AnnualReport::TimeSeries do
+  describe '#generate' do
+    subject { described_class.new(account, Time.zone.now.year) }
+
+    context 'with an inactive account' do
+      let(:account) { Fabricate :account }
+
+      it 'builds a report for an account' do
+        expect(subject.generate)
+          .to include(
+            time_series: match(
+              include(followers: 0, following: 0, month: 1, statuses: 0)
+            )
+          )
+      end
+    end
+
+    context 'with an active account' do
+      let(:account) { Fabricate :account }
+
+      let(:month_one_date) { DateTime.new(Time.zone.now.year, 1, 1, 12, 12, 12) }
+
+      let(:tag) { Fabricate :tag }
+
+      before do
+        _other = Fabricate :status
+        Fabricate :status, account: account, created_at: month_one_date
+        Fabricate :follow, account: account, created_at: month_one_date
+        Fabricate :follow, target_account: account, created_at: month_one_date
+      end
+
+      it 'builds a report for an account' do
+        expect(subject.generate)
+          .to include(
+            time_series: match(
+              include(followers: 1, following: 1, month: 1, statuses: 1)
+            )
+          )
+      end
+    end
+  end
+end
diff --git a/spec/lib/annual_report/top_hashtags_spec.rb b/spec/lib/annual_report/top_hashtags_spec.rb
new file mode 100644
index 000000000..58a915218
--- /dev/null
+++ b/spec/lib/annual_report/top_hashtags_spec.rb
@@ -0,0 +1,43 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe AnnualReport::TopHashtags do
+  describe '#generate' do
+    subject { described_class.new(account, Time.zone.now.year) }
+
+    context 'with an inactive account' do
+      let(:account) { Fabricate :account }
+
+      it 'builds a report for an account' do
+        expect(subject.generate)
+          .to include(
+            top_hashtags: be_an(Array).and(be_empty)
+          )
+      end
+    end
+
+    context 'with an active account' do
+      let(:account) { Fabricate :account }
+
+      let(:tag) { Fabricate :tag }
+
+      before do
+        _other = Fabricate :status
+        first = Fabricate :status, account: account
+        first.tags << tag
+        last = Fabricate :status, account: account
+        last.tags << tag
+      end
+
+      it 'builds a report for an account' do
+        expect(subject.generate)
+          .to include(
+            top_hashtags: contain_exactly(
+              include(name: tag.name, count: 2)
+            )
+          )
+      end
+    end
+  end
+end
diff --git a/spec/lib/annual_report/top_statuses_spec.rb b/spec/lib/annual_report/top_statuses_spec.rb
new file mode 100644
index 000000000..b956b0397
--- /dev/null
+++ b/spec/lib/annual_report/top_statuses_spec.rb
@@ -0,0 +1,50 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe AnnualReport::TopStatuses do
+  describe '#generate' do
+    subject { described_class.new(account, Time.zone.now.year) }
+
+    context 'with an inactive account' do
+      let(:account) { Fabricate :account }
+
+      it 'builds a report for an account' do
+        expect(subject.generate)
+          .to include(
+            top_statuses: include(
+              by_reblogs: be_nil,
+              by_favourites: be_nil,
+              by_replies: be_nil
+            )
+          )
+      end
+    end
+
+    context 'with an active account' do
+      let(:account) { Fabricate :account }
+
+      let(:reblogged_status) { Fabricate :status, account: account }
+      let(:favourited_status) { Fabricate :status, account: account }
+      let(:replied_status) { Fabricate :status, account: account }
+
+      before do
+        _other = Fabricate :status
+        reblogged_status.status_stat.update(reblogs_count: 123)
+        favourited_status.status_stat.update(favourites_count: 123)
+        replied_status.status_stat.update(replies_count: 123)
+      end
+
+      it 'builds a report for an account' do
+        expect(subject.generate)
+          .to include(
+            top_statuses: include(
+              by_reblogs: reblogged_status.id,
+              by_favourites: favourited_status.id,
+              by_replies: replied_status.id
+            )
+          )
+      end
+    end
+  end
+end
diff --git a/spec/lib/annual_report/type_distribution_spec.rb b/spec/lib/annual_report/type_distribution_spec.rb
new file mode 100644
index 000000000..89a31fb20
--- /dev/null
+++ b/spec/lib/annual_report/type_distribution_spec.rb
@@ -0,0 +1,48 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe AnnualReport::TypeDistribution do
+  describe '#generate' do
+    subject { described_class.new(account, Time.zone.now.year) }
+
+    context 'with an inactive account' do
+      let(:account) { Fabricate :account }
+
+      it 'builds a report for an account' do
+        expect(subject.generate)
+          .to include(
+            type_distribution: include(
+              total: 0,
+              reblogs: 0,
+              replies: 0,
+              standalone: 0
+            )
+          )
+      end
+    end
+
+    context 'with an active account' do
+      let(:account) { Fabricate :account }
+
+      before do
+        _other = Fabricate :status
+        Fabricate :status, reblog: Fabricate(:status), account: account
+        Fabricate :status, in_reply_to_id: Fabricate(:status).id, account: account, reply: true
+        Fabricate :status, account: account
+      end
+
+      it 'builds a report for an account' do
+        expect(subject.generate)
+          .to include(
+            type_distribution: include(
+              total: 3,
+              reblogs: 1,
+              replies: 1,
+              standalone: 1
+            )
+          )
+      end
+    end
+  end
+end