test: cover RouterConstraintsTest

test/test_router_advanced.rb

@@ -0,0 +1,69 @@
+require 'minitest/autorun'
+require 'prism'
+
+class RouterConstraintsTest < Minitest::Test
+  def setup
+    @router = Prism::Router.new
+  end
+
+  def test_constraint_accepts_matching_segment
+    @router.add('GET', '/users/:id', constraints: { id: /\d+/ }) {}
+    _, params = @router.matches('GET', '/users/42').first
+    assert_equal '42', params['id']
+  end
+
+  def test_constraint_rejects_non_matching_segment
+    @router.add('GET', '/users/:id', constraints: { id: /\d+/ }) {}
+    assert_empty @router.matches('GET', '/users/not-a-number')
+  end
+
+  def test_constraint_only_applies_to_the_named_segment
+    @router.add('GET', '/users/:id/posts/:slug', constraints: { id: /\d+/ }) {}
+    _, params = @router.matches('GET', '/users/7/posts/hello-world').first
+    assert_equal '7', params['id']
+    assert_equal 'hello-world', params['slug']
+    assert_empty @router.matches('GET', '/users/seven/posts/hello-world')
+  end
+end
+
+class RouterFormatTest < Minitest::Test
+  def setup
+    @router = Prism::Router.new
+  end
+
+  def test_format_disabled_by_default_dynamic_segment_keeps_dots
+    @router.add('GET', '/files/:name') {}
+    _, params = @router.matches('GET', '/files/report.pdf').first
+    assert_equal 'report.pdf', params['name']
+    refute params.key?('format')
+  end
+
+  def test_format_enabled_extracts_extension_and_shrinks_segment
+    @router.add('GET', '/posts/:id', format: true) {}
+    _, params = @router.matches('GET', '/posts/7.json').first
+    assert_equal '7', params['id']
+    assert_equal 'json', params['format']
+  end
+
+  def test_format_enabled_still_matches_without_extension
+    @router.add('GET', '/posts/:id', format: true) {}
+    _, params = @router.matches('GET', '/posts/7').first
+    assert_equal '7', params['id']
+    refute params.key?('format')
+  end
+
+  def test_format_and_constraints_combine
+    @router.add('GET', '/posts/:id', format: true, constraints: { id: /\d+/ }) {}
+    _, params = @router.matches('GET', '/posts/7.xml').first
+    assert_equal '7', params['id']
+    assert_equal 'xml', params['format']
+    assert_empty @router.matches('GET', '/posts/seven.xml')
+  end
+
+  def test_format_is_ignored_for_wildcard_patterns
+    @router.add('GET', '/files/*', format: true) {}
+    _, params = @router.matches('GET', '/files/a/b/report.pdf').first
+    assert_equal ['a/b/report.pdf'], params['splat']
+    refute params.key?('format')
+  end
+end