3 files changed, 167 insertions, 0 deletions
diff --git a/spec/support_specs/graphql/arguments_spec.rb b/spec/support_specs/graphql/arguments_spec.rb
new file mode 100644
index 00000000000..ffb58503a0e
--- /dev/null
+++ b/spec/support_specs/graphql/arguments_spec.rb
@@ -0,0 +1,71 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe Graphql::Arguments do
+  it 'returns a blank string if the arguments are blank' do
+    args = described_class.new({})
+
+    expect("#{args}").to be_blank
+  end
+
+  it 'returns a serialized arguments if the arguments are not blank' do
+    units = described_class.new({ temp: :CELSIUS, time: :MINUTES })
+    args = described_class.new({ temp: 180, time: 45, units: units })
+
+    expect("#{args}").to eq('temp: 180, time: 45, units: {temp: CELSIUS, time: MINUTES}')
+  end
+
+  it 'supports merge with +' do
+    lhs = described_class.new({ a: 1, b: 2 })
+    rhs = described_class.new({ b: 3, c: 4 })
+
+    expect(lhs + rhs).to eq({ a: 1, b: 3, c: 4 })
+  end
+
+  it 'supports merge with + and a string' do
+    lhs = described_class.new({ a: 1, b: 2 })
+    rhs = 'x: no'
+
+    expect(lhs + rhs).to eq('a: 1, b: 2, x: no')
+  end
+
+  it 'supports merge with + and a string when empty' do
+    lhs = described_class.new({})
+    rhs = 'x: no'
+
+    expect(lhs + rhs).to eq('x: no')
+  end
+
+  it 'supports merge with + and an empty string' do
+    lhs = described_class.new({ a: 1 })
+    rhs = ''
+
+    expect(lhs + rhs).to eq({ a: 1 })
+  end
+
+  it 'serializes all values correctly' do
+    args = described_class.new({
+      array: [1, 2.5, "foo", nil, true, false, :BAR, { power: :on }],
+      hash: { a: 1, b: 2, c: 3 },
+      int: 42,
+      float: 2.7,
+      string: %q[he said "no"],
+      enum: :OFF,
+      null: nil, # we expect this to be omitted - absence is the same as explicit nullness
+      bool_true: true,
+      bool_false: false,
+      var: ::Graphql::Var.new('x', 'Int')
+    })
+
+    expect(args.to_s).to eq([
+      %q(array: [1,2.5,"foo",null,true,false,BAR,{power: on}]),
+      %q(hash: {a: 1, b: 2, c: 3}),
+      'int: 42, float: 2.7',
+      %q(string: "he said \\"no\\""),
+      'enum: OFF',
+      'boolTrue: true, boolFalse: false',
+      'var: $x'
+    ].join(', '))
+  end
+end
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
diff --git a/spec/support_specs/graphql/var_spec.rb b/spec/support_specs/graphql/var_spec.rb
new file mode 100644
index 00000000000..f708f01a11e
--- /dev/null
+++ b/spec/support_specs/graphql/var_spec.rb
@@ -0,0 +1,34 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe ::Graphql::Var do
+  subject(:var) { described_class.new('foo', 'Int') }
+
+  it 'associates a name with a type and an initially empty value' do
+    expect(var).to have_attributes(
+      name: 'foo',
+      type: 'Int',
+      value: be_nil
+    )
+  end
+
+  it 'has a correct signature' do
+    expect(var).to have_attributes(sig: '$foo: Int')
+  end
+
+  it 'implements to_graphql_value as $name' do
+    expect(var.to_graphql_value).to eq('$foo')
+  end
+
+  it 'can set a value using with, returning a new object' do
+    with_value = var.with(42)
+
+    expect(with_value).to have_attributes(name: 'foo', type: 'Int', value: 42)
+    expect(var).to have_attributes(value: be_nil)
+  end
+
+  it 'returns an object suitable for passing to post_graphql(variables:)' do
+    expect(var.with(17).to_h).to eq('foo' => 17)
+  end
+end