Basic implementation of UnreachableCode rule

spec/ameba/ast/visitors/flow_expression_visitor_spec.cr

@@ -0,0 +1,66 @@
+require "../../../spec_helper"
+
+module Ameba::AST
+  source = Source.new ""
+
+  describe FlowExpressionVisitor do
+    it "creates an expression for return" do
+      rule = FlowExpressionRule.new
+      FlowExpressionVisitor.new rule, Source.new %(
+        def foo
+          return :bar
+        end
+      )
+      rule.expressions.size.should eq 1
+    end
+
+    it "can create multiple expressions" do
+      rule = FlowExpressionRule.new
+      FlowExpressionVisitor.new rule, Source.new %(
+        def foo
+          if bar
+            return :baz
+          else
+            return :foobar
+          end
+        end
+      )
+      rule.expressions.size.should eq 2
+    end
+
+    it "properly creates nested flow expressions" do
+      rule = FlowExpressionRule.new
+      FlowExpressionVisitor.new rule, Source.new %(
+        def foo
+          return(
+            loop do
+              break if a > 1
+              return a
+            end
+          )
+        end
+      )
+      rule.expressions.size.should eq 3
+    end
+
+    it "creates an expression for break" do
+      rule = FlowExpressionRule.new
+      FlowExpressionVisitor.new rule, Source.new %(
+        while true
+          break
+        end
+      )
+      rule.expressions.size.should eq 1
+    end
+
+    it "creates an expression for next" do
+      rule = FlowExpressionRule.new
+      FlowExpressionVisitor.new rule, Source.new %(
+        while true
+          next if something
+        end
+      )
+      rule.expressions.size.should eq 1
+    end
+  end
+end