diff --git a/spec/lib/mastodon/cli/accounts_spec.rb b/spec/lib/mastodon/cli/accounts_spec.rb
index c214d93ec..fe2b4ec35 100644
--- a/spec/lib/mastodon/cli/accounts_spec.rb
+++ b/spec/lib/mastodon/cli/accounts_spec.rb
@@ -164,4 +164,185 @@ describe Mastodon::CLI::Accounts do
       end
     end
   end
+
+  describe '#modify' do
+    context 'when the given username is not found' do
+      let(:arguments) { ['non_existent_username'] }
+
+      it 'exits with an error message indicating the user was not found' do
+        expect { cli.invoke(:modify, arguments) }.to output(
+          a_string_including('No user with such username')
+        ).to_stdout
+          .and raise_error(SystemExit)
+      end
+    end
+
+    context 'when the given username is found' do
+      let(:user) { Fabricate(:user) }
+      let(:arguments) { [user.account.username] }
+
+      context 'when no option is provided' do
+        it 'returns a successful message' do
+          expect { cli.invoke(:modify, arguments) }.to output(
+            a_string_including('OK')
+          ).to_stdout
+        end
+
+        it 'does not modify the user' do
+          cli.invoke(:modify, arguments)
+
+          expect(user).to eq(user.reload)
+        end
+      end
+
+      context 'with --role option' do
+        context 'when the given role is not found' do
+          let(:options) { { role: '404' } }
+
+          it 'exits with an error message indicating the role was not found' do
+            expect { cli.invoke(:modify, arguments, options) }.to output(
+              a_string_including('Cannot find user role with that name')
+            ).to_stdout
+              .and raise_error(SystemExit)
+          end
+        end
+
+        context 'when the given role is found' do
+          let(:default_role) { Fabricate(:user_role) }
+          let(:options) { { role: default_role.name } }
+
+          it "updates the user's role to the specified role" do
+            cli.invoke(:modify, arguments, options)
+
+            role = user.reload.role
+
+            expect(role.name).to eq(default_role.name)
+          end
+        end
+      end
+
+      context 'with --remove-role option' do
+        let(:options) { { remove_role: true } }
+        let(:role) { Fabricate(:user_role) }
+        let(:user) { Fabricate(:user, role: role) }
+
+        it "removes the user's role successfully" do
+          cli.invoke(:modify, arguments, options)
+
+          role = user.reload.role
+
+          expect(role.name).to be_empty
+        end
+      end
+
+      context 'with --email option' do
+        let(:user) { Fabricate(:user, email: 'old_email@email.com') }
+        let(:options) { { email: 'new_email@email.com' } }
+
+        it "sets the user's unconfirmed email to the provided email address" do
+          cli.invoke(:modify, arguments, options)
+
+          expect(user.reload.unconfirmed_email).to eq(options[:email])
+        end
+
+        it "does not update the user's original email address" do
+          cli.invoke(:modify, arguments, options)
+
+          expect(user.reload.email).to eq('old_email@email.com')
+        end
+
+        context 'with --confirm option' do
+          let(:user) { Fabricate(:user, email: 'old_email@email.com', confirmed_at: nil) }
+          let(:options) { { email: 'new_email@email.com', confirm: true } }
+
+          it "updates the user's email address to the provided email" do
+            cli.invoke(:modify, arguments, options)
+
+            expect(user.reload.email).to eq(options[:email])
+          end
+
+          it "sets the user's email address as confirmed" do
+            cli.invoke(:modify, arguments, options)
+
+            expect(user.reload.confirmed?).to be(true)
+          end
+        end
+      end
+
+      context 'with --confirm option' do
+        let(:user) { Fabricate(:user, confirmed_at: nil) }
+        let(:options) { { confirm: true } }
+
+        it "confirms the user's email address" do
+          cli.invoke(:modify, arguments, options)
+
+          expect(user.reload.confirmed?).to be(true)
+        end
+      end
+
+      context 'with --approve option' do
+        let(:user) { Fabricate(:user, approved: false) }
+        let(:options) { { approve: true } }
+
+        before do
+          Form::AdminSettings.new(registrations_mode: 'approved').save
+        end
+
+        it 'approves the user' do
+          expect { cli.invoke(:modify, arguments, options) }.to change { user.reload.approved }.from(false).to(true)
+        end
+      end
+
+      context 'with --disable option' do
+        let(:user) { Fabricate(:user, disabled: false) }
+        let(:options) { { disable: true } }
+
+        it 'disables the user' do
+          expect { cli.invoke(:modify, arguments, options) }.to change { user.reload.disabled }.from(false).to(true)
+        end
+      end
+
+      context 'with --enable option' do
+        let(:user) { Fabricate(:user, disabled: true) }
+        let(:options) { { enable: true } }
+
+        it 'enables the user' do
+          expect { cli.invoke(:modify, arguments, options) }.to change { user.reload.disabled }.from(true).to(false)
+        end
+      end
+
+      context 'with --reset-password option' do
+        let(:options) { { reset_password: true } }
+
+        it 'returns a new password for the user' do
+          allow(SecureRandom).to receive(:hex).and_return('new_password')
+
+          expect { cli.invoke(:modify, arguments, options) }.to output(
+            a_string_including('new_password')
+          ).to_stdout
+        end
+      end
+
+      context 'with --disable-2fa option' do
+        let(:user) { Fabricate(:user, otp_required_for_login: true) }
+        let(:options) { { disable_2fa: true } }
+
+        it 'disables the two-factor authentication for the user' do
+          expect { cli.invoke(:modify, arguments, options) }.to change { user.reload.otp_required_for_login }.from(true).to(false)
+        end
+      end
+
+      context 'when provided data is invalid' do
+        let(:user) { Fabricate(:user) }
+        let(:options) { { email: 'invalid' } }
+
+        it 'exits with an error message' do
+          expect { cli.invoke(:modify, arguments, options) }.to output(
+            a_string_including('Failure/Error: email')
+          ).to_stdout
+            .and raise_error(SystemExit)
+        end
+      end
+    end
+  end
 end