Add {% liquid %}, {% echo %}, and {% local %} tags

test/integration/tags/echo_test.rb

@@ -0,0 +1,11 @@
+require 'test_helper'
+
+class EchoTest < Minitest::Test
+  include Liquid
+
+  def test_echo_outputs_its_input
+    assert_template_result('BAR', <<~LIQUID, { 'variable-name' => 'bar' })
+      {%- echo variable-name | upcase -%}
+    LIQUID
+  end
+end

test/integration/tags/liquid_tag_test.rb

@@ -0,0 +1,98 @@
+require 'test_helper'
+
+class LiquidTagTest < Minitest::Test
+  include Liquid
+
+  def test_liquid_tag
+    assert_template_result('1 2 3', <<~LIQUID, 'array' => [1, 2, 3])
+    {%- liquid
+      echo array | join: " "
+    -%}
+    LIQUID
+
+    assert_template_result('1 2 3', <<~LIQUID, 'array' => [1, 2, 3])
+    {%- liquid
+      for value in array
+        echo value
+        unless forloop.last
+          echo " "
+        endunless
+      endfor
+    -%}
+    LIQUID
+
+    assert_template_result('4 8 12', <<~LIQUID, 'array' => [1, 2, 3])
+    {%- liquid
+      for value in array
+        local double_value = value | times: 2
+        echo double_value | times: 2
+        unless forloop.last
+          echo " "
+        endunless
+      endfor
+
+      echo double_value
+    -%}
+    LIQUID
+
+    assert_template_result('abc', <<~LIQUID)
+    {%- liquid echo "a" -%}
+    b
+    {%- liquid echo "c" -%}
+    LIQUID
+  end
+
+  def test_liquid_tag_errors
+    assert_match_syntax_error("syntax error (line 1): Unknown tag 'error'", <<~LIQUID)
+    {%- liquid error no such tag -%}
+    LIQUID
+
+    assert_match_syntax_error("syntax error (line 7): Unknown tag 'error'", <<~LIQUID)
+    {{ test }}
+
+    {%-
+    liquid
+      for value in array
+
+        error no such tag
+      endfor
+    -%}
+    LIQUID
+
+    assert_match_syntax_error("syntax error (line 2): Unknown tag '!!! the guards are vigilant'", <<~LIQUID)
+    {%- liquid
+      !!! the guards are vigilant
+    -%}
+    LIQUID
+
+    assert_match_syntax_error("syntax error (line 4): 'for' tag was never closed", <<~LIQUID)
+    {%- liquid
+      for value in array
+        echo 'forgot to close the for tag'
+    -%}
+    LIQUID
+  end
+
+  def test_cannot_open_blocks_living_past_a_liquid_tag
+    assert_match_syntax_error("syntax error (line 3): 'if' tag was never closed", <<~LIQUID)
+    {%- liquid
+      if true
+    -%}
+    {%- endif -%}
+    LIQUID
+  end
+
+  def test_quirk_can_close_blocks_created_before_a_liquid_tag
+    assert_template_result("42", <<~LIQUID)
+    {%- if true -%}
+    42
+    {%- liquid endif -%}
+    LIQUID
+  end
+
+  def test_liquid_tag_in_raw
+    assert_template_result("{% liquid echo 'test' %}\n", <<~LIQUID)
+    {% raw %}{% liquid echo 'test' %}{% endraw %}
+    LIQUID
+  end
+end

test/integration/tags/local_test.rb

@@ -0,0 +1,15 @@
+require 'test_helper'
+
+class LocalTest < Minitest::Test
+  include Liquid
+
+  def test_local_is_scope_aware
+    assert_template_result('value', <<~LIQUID)
+      {%- if true -%}
+        {%- local variable-name = 'value' -%}
+        {{- variable-name -}}
+      {%- endif -%}
+      {{- variable-name -}}
+    LIQUID
+  end
+end