Add some specs related to ECR files

spec/ameba/rule/layout/trailing_blank_lines_spec.cr

@@ -52,5 +52,12 @@ module Ameba::Rule::Layout
         issue.message.should eq "Trailing newline missing"
       end
     end
+
+    {% if compare_versions(Crystal::VERSION, "1.15.0") >= 0 %}
+      it "fails if there more then one blank line at the end of an ECR source" do
+        source = expect_issue subject, "a = 1\n \n # error: Excessive trailing newline detected", "source.ecr"
+        expect_no_corrections source
+      end
+    {% end %}
   end
 end

spec/ameba/rule/layout/trailing_whitespace_spec.cr

@@ -15,5 +15,16 @@ module Ameba::Rule::Layout
 
       expect_correction source, "whitespace at the end"
     end
+
+    {% if compare_versions(Crystal::VERSION, "1.15.0") >= 0 %}
+      it "fails if there is a line with trailing whitespace in an ECR file" do
+        source = expect_issue subject,
+          "whitespace at the end  \n" \
+          "                   # ^^ error: Trailing whitespace detected",
+          path: "source.ecr"
+
+        expect_correction source, "whitespace at the end"
+      end
+    {% end %}
   end
 end

spec/ameba/rule/lint/formatting_spec.cr

@@ -53,5 +53,18 @@ module Ameba::Rule::Lint
         end
       end
     end
+
+    {% if compare_versions(Crystal::VERSION, "1.15.0") >= 0 %}
+      it "passes ECR files regardless of formatting" do
+        source = expect_no_issues subject, <<-CRYSTAL, "source.ecr"
+          <%
+            def method(a,b,c=0)
+              a+b+c
+            end
+          %>
+
+          CRYSTAL
+      end
+    {% end %}
   end
 end

spec/ameba/rule/lint/literal_in_condition_spec.cr

@@ -175,5 +175,17 @@ module Ameba::Rule::Lint
       issue.end_location.to_s.should eq "source.cr:1:20"
       issue.message.should eq "Literal value found in conditional"
     end
+
+    {% if compare_versions(Crystal::VERSION, "1.15.0") >= 0 %}
+      it "fails if there is a predicate in if conditional in an ECR file" do
+        s = Source.new %(
+          <% if "string" %>
+            :ok
+          <% end %>
+        ), "source.ecr"
+
+        subject.catch(s).should_not be_valid
+      end
+    {% end %}
   end
 end

spec/ameba/rule/lint/unused_literal_spec.cr

@@ -295,5 +295,20 @@ module Ameba::Rule::Lint
             CRYSTAL
       end
     {% end %}
+
+    {% if compare_versions(Crystal::VERSION, "1.15.0") >= 0 %}
+      it "passes if a string is used in an assign directive in an ECR file" do
+        expect_no_issues subject, <<-CRYSTAL, path: "source.ecr"
+          <%= "hello world" %>
+          CRYSTAL
+      end
+
+      it "fails if a string is unused in an ECR file" do
+        expect_issue subject, <<-CRYSTAL, path: "source.ecr"
+          <% "hello world" %>
+           # ^^^^^^^^^^^^^ error: Literal value is not used
+          CRYSTAL
+      end
+    {% end %}
   end
 end

spec/ameba/source_spec.cr

@@ -70,5 +70,31 @@ module Ameba
           CRYSTAL
       end
     end
+
+    {% if compare_versions(Crystal::VERSION, "1.15.0") >= 0 %}
+      describe "#ast" do
+        it "parses an ECR file" do
+          source = Source.new <<-ECR, "filename.ecr"
+            hello <%= "world" %>
+            ECR
+
+          source.ast.to_s.should eq(<<-CRYSTAL)
+            __str__ << "hello "
+            ("world").to_s(__str__)
+
+            CRYSTAL
+        end
+
+        it "raises an exception when ECR parsing fails" do
+          source = Source.new <<-ECR, "filename.ecr"
+            hello <%= "world" >
+            ECR
+
+          expect_raises(Crystal::SyntaxException) do
+            source.ast
+          end
+        end
+      end
+    {% end %}
   end
 end