Add tests for mute rule use cases

spec/lib/use_case/mute_rule/create_spec.rb

@@ -0,0 +1,27 @@
+# frozen_string_literal: true
+
+require "rails_helper"
+
+describe UseCase::MuteRule::Create do
+  subject { UseCase::MuteRule::Create.call(user:, phrase:) }
+
+  context "user passed" do
+    let(:user) { FactoryBot.create(:user) }
+
+    context "phrase is empty" do
+      let(:phrase) { "" }
+
+      it "does not create the rule" do
+        expect { subject }.not_to(change { MuteRule.count })
+      end
+    end
+
+    context "phrase is non-empty" do
+      let(:phrase) { "test" }
+
+      it "creates the rule" do
+        expect { subject }.to change { MuteRule.count }.by(1)
+      end
+    end
+  end
+end

spec/lib/use_case/mute_rule/destroy_spec.rb

@@ -0,0 +1,16 @@
+# frozen_string_literal: true
+
+require "rails_helper"
+
+describe UseCase::MuteRule::Destroy do
+  subject { UseCase::MuteRule::Destroy.call(rule:) }
+
+  context "rule exists" do
+    let(:user) { FactoryBot.create(:user) }
+    let(:rule) { MuteRule.create(user:, muted_phrase: "test") }
+
+    it "deletes the mute rule" do
+      expect { subject }.to change { MuteRule.exists?(rule.id) }.from(true).to(false)
+    end
+  end
+end