1 files changed, 73 insertions, 0 deletions
diff --git a/spec/lib/gitlab/ci/pipeline/expression/lexeme/not_equals_spec.rb b/spec/lib/gitlab/ci/pipeline/expression/lexeme/not_equals_spec.rb
new file mode 100644
index 00000000000..38d30c9035a
--- /dev/null
+++ b/spec/lib/gitlab/ci/pipeline/expression/lexeme/not_equals_spec.rb
@@ -0,0 +1,73 @@
+require 'spec_helper'
+
+describe Gitlab::Ci::Pipeline::Expression::Lexeme::NotEquals do
+  let(:left) { double('left') }
+  let(:right) { double('right') }
+
+  describe '.build' do
+    context 'with non-evaluable operands' do
+      it 'creates a new instance of the token' do
+        expect { described_class.build('!=', left, right) }
+          .to raise_error Gitlab::Ci::Pipeline::Expression::Lexeme::Operator::OperatorError
+      end
+    end
+
+    context 'with evaluable operands' do
+      it 'creates a new instance of the token' do
+        allow(left).to receive(:evaluate).and_return('my-string')
+        allow(right).to receive(:evaluate).and_return('my-string')
+
+        expect(described_class.build('!=', left, right))
+          .to be_a(described_class)
+      end
+    end
+  end
+
+  describe '.type' do
+    it 'is an operator' do
+      expect(described_class.type).to eq :operator
+    end
+  end
+
+  describe '.precedence' do
+    it 'has a precedence' do
+      expect(described_class.precedence).to be_an Integer
+    end
+  end
+
+  describe '#evaluate' do
+    let(:operator) { described_class.new(left, right) }
+
+    subject { operator.evaluate }
+
+    before do
+      allow(left).to receive(:evaluate).and_return(left_value)
+      allow(right).to receive(:evaluate).and_return(right_value)
+    end
+
+    context 'when left and right are equal' do
+      using RSpec::Parameterized::TableSyntax
+
+      where(:left_value, :right_value) do
+        'string' | 'string'
+        1        | 1
+        ''       | ''
+        nil      | nil
+      end
+
+      with_them do
+        it { is_expected.to eq(false) }
+      end
+    end
+
+    context 'when left and right are not equal' do
+      where(:left_value, :right_value) do
+        ['one string', 'two string', 1, 2, '', nil, false, true].permutation(2).to_a
+      end
+
+      with_them do
+        it { is_expected.to eq(true) }
+      end
+    end
+  end
+end