1 files changed, 62 insertions, 0 deletions
diff --git a/spec/support_specs/graphql/field_selection_spec.rb b/spec/support_specs/graphql/field_selection_spec.rb
new file mode 100644
index 00000000000..8818e59e598
--- /dev/null
+++ b/spec/support_specs/graphql/field_selection_spec.rb
@@ -0,0 +1,62 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe Graphql::FieldSelection do
+  it 'can report on the paths that are selected' do
+    selection = described_class.new({
+      'foo' => nil,
+      'bar' => nil,
+      'quux' => {
+        'a' => nil,
+        'b' => { 'x' => nil, 'y' => nil }
+      },
+      'qoox' => {
+        'q' => nil,
+        'r' => { 's' => { 't' => nil } }
+      }
+    })
+
+    expect(selection.paths).to include(
+      %w[foo],
+      %w[quux a],
+      %w[quux b x],
+      %w[qoox r s t]
+    )
+  end
+
+  it 'can serialize a field selection nicely' do
+    selection = described_class.new({
+      'foo' => nil,
+      'bar' => nil,
+      'quux' => {
+        'a' => nil,
+        'b' => { 'x' => nil, 'y' => nil }
+      },
+      'qoox' => {
+        'q' => nil,
+        'r' => { 's' => { 't' => nil } }
+      }
+    })
+
+    expect(selection.to_s).to eq(<<~FRAG.strip)
+    foo
+    bar
+    quux {
+     a
+     b {
+      x
+      y
+     }
+    }
+    qoox {
+     q
+     r {
+      s {
+       t
+      }
+     }
+    }
+    FRAG
+  end
+end