Merge pull request #414 from crystal-ameba/add-ascii-identifiers-rule

Add `Naming/AsciiIdentifiers` rule

spec/ameba/rule/naming/ascii_identifiers_spec.cr

@@ -0,0 +1,94 @@
+require "../../../spec_helper"
+
+module Ameba::Rule::Naming
+  subject = AsciiIdentifiers.new
+
+  describe AsciiIdentifiers do
+    it "reports classes with names containing non-ascii characters" do
+      expect_issue subject, <<-CRYSTAL
+        class BigAwesome🐺
+            # ^^^^^^^^^^^ error: Identifier contains non-ascii characters
+          @🐺_name : String
+        # ^^^^^^^ error: Identifier contains non-ascii characters
+        end
+        CRYSTAL
+    end
+
+    it "reports modules with names containing non-ascii characters" do
+      expect_issue subject, <<-CRYSTAL
+        module Bąk
+             # ^^^ error: Identifier contains non-ascii characters
+          @@bąk_name : String
+        # ^^^^^^^^^^ error: Identifier contains non-ascii characters
+        end
+        CRYSTAL
+    end
+
+    it "reports enums with names containing non-ascii characters" do
+      expect_issue subject, <<-CRYSTAL
+        enum TypeOf🔥
+           # ^^^^^^^ error: Identifier contains non-ascii characters
+        end
+        CRYSTAL
+    end
+
+    it "reports defs with names containing non-ascii characters" do
+      expect_issue subject, <<-CRYSTAL
+        def łódź
+          # ^^^^ error: Identifier contains non-ascii characters
+        end
+        CRYSTAL
+    end
+
+    it "reports defs with parameter names containing non-ascii characters" do
+      expect_issue subject, <<-CRYSTAL
+        def forest_adventure(include_🐺 = true, include_🐿 = true)
+                           # ^ error: Identifier contains non-ascii characters
+                                             # ^ error: Identifier contains non-ascii characters
+        end
+        CRYSTAL
+    end
+
+    it "reports argument names containing non-ascii characters" do
+      expect_issue subject, <<-CRYSTAL
+        %w[wensleydale cheddar brie].each { |🧀| nil }
+                                           # ^ error: Identifier contains non-ascii characters
+        CRYSTAL
+    end
+
+    it "reports aliases with names containing non-ascii characters" do
+      expect_issue subject, <<-CRYSTAL
+        alias JSON🧀 = JSON::Any
+            # ^^^^^ error: Identifier contains non-ascii characters
+        CRYSTAL
+    end
+
+    it "reports constants with names containing non-ascii characters" do
+      expect_issue subject, <<-CRYSTAL
+        I_LOVE_🍣 = true
+        # ^^^^^^ error: Identifier contains non-ascii characters
+        CRYSTAL
+    end
+
+    it "reports assignments with variable names containing non-ascii characters" do
+      expect_issue subject, <<-CRYSTAL
+        space_👾 = true
+        # ^^^^^ error: Identifier contains non-ascii characters
+        CRYSTAL
+    end
+
+    it "reports multiple assignments with variable names containing non-ascii characters" do
+      expect_issue subject, <<-CRYSTAL
+        foo, space_👾 = true, true
+           # ^^^^^^^ error: Identifier contains non-ascii characters
+        CRYSTAL
+    end
+
+    it "passes for strings with non-ascii characters" do
+      expect_no_issues subject, <<-CRYSTAL
+        space = "👾"
+        space = :invader # 👾
+        CRYSTAL
+    end
+  end
+end