Utilize Source#spec?

spec/ameba/source_spec.cr

@@ -23,6 +23,18 @@ module Ameba
       end
     end
 
+    describe "#spec?" do
+      it "returns true if the source is a spec file" do
+        s = Source.new "", "./source_spec.cr"
+        s.spec?.should be_true
+      end
+
+      it "returns false if the source is not a spec file" do
+        s = Source.new "", "./source.cr"
+        s.spec?.should be_false
+      end
+    end
+
     describe "#matches_path?" do
       it "returns true if source's path is matched" do
         s = Source.new "", "source.cr"

src/ameba/rule/lint/spec_focus.cr

@@ -53,7 +53,7 @@ module Ameba::Rule::Lint
     SPEC_ITEM_NAMES = %w(describe context it pending)
 
     def test(source)
-      return unless source.path.ends_with?("_spec.cr")
+      return unless source.spec?
 
       AST::NodeVisitor.new self, source
     end

src/ameba/source.cr

@@ -53,7 +53,12 @@ module Ameba
       File.expand_path(path)
     end
 
-    # Returns true if *filepath* matches the source's path, false if it does not.
+    # Returns `true` if the source is a spec file, `false` otherwise.
+    def spec?
+      path.ends_with?("_spec.cr")
+    end
+
+    # Returns `true` if *filepath* matches the source's path, `false` if it does not.
     def matches_path?(filepath)
       path == filepath || path == File.expand_path(filepath)
     end