Seperate unit and integration tests.

This makes it easier to re-use the integration tests in a seperate gem that
optimizes parts of liquid with a native implementation.

test/unit/condition_unit_test.rb

@@ -0,0 +1,127 @@
+require 'test_helper'
+
+class ConditionUnitTest < Test::Unit::TestCase
+  include Liquid
+
+  def test_basic_condition
+    assert_equal false, Condition.new('1', '==', '2').evaluate
+    assert_equal true,  Condition.new('1', '==', '1').evaluate
+  end
+
+  def test_default_operators_evalute_true
+    assert_evalutes_true '1', '==', '1'
+    assert_evalutes_true '1', '!=', '2'
+    assert_evalutes_true '1', '<>', '2'
+    assert_evalutes_true '1', '<', '2'
+    assert_evalutes_true '2', '>', '1'
+    assert_evalutes_true '1', '>=', '1'
+    assert_evalutes_true '2', '>=', '1'
+    assert_evalutes_true '1', '<=', '2'
+    assert_evalutes_true '1', '<=', '1'
+    # negative numbers
+    assert_evalutes_true '1', '>', '-1'
+    assert_evalutes_true '-1', '<', '1'
+    assert_evalutes_true '1.0', '>', '-1.0'
+    assert_evalutes_true '-1.0', '<', '1.0'
+  end
+
+  def test_default_operators_evalute_false
+    assert_evalutes_false '1', '==', '2'
+    assert_evalutes_false '1', '!=', '1'
+    assert_evalutes_false '1', '<>', '1'
+    assert_evalutes_false '1', '<', '0'
+    assert_evalutes_false '2', '>', '4'
+    assert_evalutes_false '1', '>=', '3'
+    assert_evalutes_false '2', '>=', '4'
+    assert_evalutes_false '1', '<=', '0'
+    assert_evalutes_false '1', '<=', '0'
+  end
+
+  def test_contains_works_on_strings
+    assert_evalutes_true "'bob'", 'contains', "'o'"
+    assert_evalutes_true "'bob'", 'contains', "'b'"
+    assert_evalutes_true "'bob'", 'contains', "'bo'"
+    assert_evalutes_true "'bob'", 'contains', "'ob'"
+    assert_evalutes_true "'bob'", 'contains', "'bob'"
+
+    assert_evalutes_false "'bob'", 'contains', "'bob2'"
+    assert_evalutes_false "'bob'", 'contains', "'a'"
+    assert_evalutes_false "'bob'", 'contains', "'---'"
+  end
+
+  def test_contains_works_on_arrays
+    @context = Liquid::Context.new
+    @context['array'] = [1,2,3,4,5]
+
+    assert_evalutes_false "array",  'contains', '0'
+    assert_evalutes_true "array",   'contains', '1'
+    assert_evalutes_true "array",   'contains', '2'
+    assert_evalutes_true "array",   'contains', '3'
+    assert_evalutes_true "array",   'contains', '4'
+    assert_evalutes_true "array",   'contains', '5'
+    assert_evalutes_false "array",  'contains', '6'
+    assert_evalutes_false "array",  'contains', '"1"'
+  end
+
+  def test_contains_returns_false_for_nil_operands
+    @context = Liquid::Context.new
+    assert_evalutes_false "not_assigned", 'contains', '0'
+    assert_evalutes_false "0", 'contains', 'not_assigned'
+  end
+
+  def test_or_condition
+    condition = Condition.new('1', '==', '2')
+
+    assert_equal false, condition.evaluate
+
+    condition.or Condition.new('2', '==', '1')
+
+    assert_equal false, condition.evaluate
+
+    condition.or Condition.new('1', '==', '1')
+
+    assert_equal true, condition.evaluate
+  end
+
+  def test_and_condition
+    condition = Condition.new('1', '==', '1')
+
+    assert_equal true, condition.evaluate
+
+    condition.and Condition.new('2', '==', '2')
+
+    assert_equal true, condition.evaluate
+
+    condition.and Condition.new('2', '==', '1')
+
+    assert_equal false, condition.evaluate
+  end
+
+  def test_should_allow_custom_proc_operator
+    Condition.operators['starts_with'] = Proc.new { |cond, left, right| left =~ %r{^#{right}} }
+
+    assert_evalutes_true "'bob'",   'starts_with', "'b'"
+    assert_evalutes_false "'bob'",  'starts_with', "'o'"
+
+    ensure
+      Condition.operators.delete 'starts_with'
+  end
+
+  def test_left_or_right_may_contain_operators
+    @context = Liquid::Context.new
+    @context['one'] = @context['another'] = "gnomeslab-and-or-liquid"
+
+    assert_evalutes_true "one", '==', "another"
+  end
+
+  private
+    def assert_evalutes_true(left, op, right)
+      assert Condition.new(left, op, right).evaluate(@context || Liquid::Context.new),
+             "Evaluated false: #{left} #{op} #{right}"
+    end
+
+    def assert_evalutes_false(left, op, right)
+      assert !Condition.new(left, op, right).evaluate(@context || Liquid::Context.new),
+             "Evaluated true: #{left} #{op} #{right}"
+    end
+end # ConditionTest