Convert CI YAML variables keys into strings

So that this would be more consistent with the other variables,
which all of them are string based.

Closes #25554

4 files changed, 33 insertions, 14 deletions

diff --git a/spec/factories/ci/builds.rb b/spec/factories/ci/builds.rb
index 62466c06194..0397d5d4001 100644
--- a/spec/factories/ci/builds.rb
+++ b/spec/factories/ci/builds.rb
@@ -22,7 +22,7 @@ FactoryGirl.define do
 
     yaml_variables do
       [
-        { key: :DB_NAME, value: 'postgres', public: true }
+        { key: 'DB_NAME', value: 'postgres', public: true }
       ]
     end
 
diff --git a/spec/lib/ci/gitlab_ci_yaml_processor_spec.rb b/spec/lib/ci/gitlab_ci_yaml_processor_spec.rb
index ff5dcc06ab3..62d68721574 100644
--- a/spec/lib/ci/gitlab_ci_yaml_processor_spec.rb
+++ b/spec/lib/ci/gitlab_ci_yaml_processor_spec.rb
@@ -483,7 +483,7 @@ module Ci
 
       context 'when global variables are defined' do
         let(:variables) do
-          { VAR1: 'value1', VAR2: 'value2' }
+          { 'VAR1' => 'value1', 'VAR2' => 'value2' }
         end
         let(:config) do
           {
@@ -495,18 +495,18 @@ module Ci
 
         it 'returns global variables' do
           expect(subject).to contain_exactly(
-            { key: :VAR1, value: 'value1', public: true },
-            { key: :VAR2, value: 'value2', public: true }
+            { key: 'VAR1', value: 'value1', public: true },
+            { key: 'VAR2', value: 'value2', public: true }
           )
         end
       end
 
       context 'when job and global variables are defined' do
         let(:global_variables) do
-          { VAR1: 'global1', VAR3: 'global3' }
+          { 'VAR1' => 'global1', 'VAR3' => 'global3' }
         end
         let(:job_variables) do
-          { VAR1: 'value1', VAR2: 'value2' }
+          { 'VAR1' => 'value1', 'VAR2' => 'value2' }
         end
         let(:config) do
           {
@@ -518,9 +518,9 @@ module Ci
 
         it 'returns all unique variables' do
           expect(subject).to contain_exactly(
-            { key: :VAR3, value: 'global3', public: true },
-            { key: :VAR1, value: 'value1', public: true },
-            { key: :VAR2, value: 'value2', public: true }
+            { key: 'VAR3', value: 'global3', public: true },
+            { key: 'VAR1', value: 'value1', public: true },
+            { key: 'VAR2', value: 'value2', public: true }
           )
         end
       end
@@ -535,13 +535,13 @@ module Ci
 
         context 'when syntax is correct' do
           let(:variables) do
-            { VAR1: 'value1', VAR2: 'value2' }
+            { 'VAR1' => 'value1', 'VAR2' => 'value2' }
           end
 
           it 'returns job variables' do
             expect(subject).to contain_exactly(
-              { key: :VAR1, value: 'value1', public: true },
-              { key: :VAR2, value: 'value2', public: true }
+              { key: 'VAR1', value: 'value1', public: true },
+              { key: 'VAR2', value: 'value2', public: true }
             )
           end
         end
@@ -549,7 +549,7 @@ module Ci
         context 'when syntax is incorrect' do
           context 'when variables defined but invalid' do
             let(:variables) do
-              [ :VAR1, 'value1', :VAR2, 'value2' ]
+              [ 'VAR1', 'value1', 'VAR2', 'value2' ]
             end
 
             it 'raises error' do
diff --git a/spec/lib/gitlab/serialize/yaml_variables_spec.rb b/spec/lib/gitlab/serialize/yaml_variables_spec.rb
new file mode 100644
index 00000000000..6d74f8c44d6
--- /dev/null
+++ b/spec/lib/gitlab/serialize/yaml_variables_spec.rb
@@ -0,0 +1,19 @@
+require 'spec_helper'
+
+describe Gitlab::Serialize::YamlVariables do
+  subject do
+    Gitlab::Serialize::YamlVariables.load(
+      Gitlab::Serialize::YamlVariables.dump(object))
+  end
+
+  let(:object) do
+    [{ key: :key, value: 'value', public: true },
+     { key: 'wee', value: 1, public: false }]
+  end
+
+  it 'converts key and values into strings' do
+    is_expected.to eq([
+      { key: 'key', value: 'value', public: true },
+      { key: 'wee', value: '1', public: false }])
+  end
+end
diff --git a/spec/models/build_spec.rb b/spec/models/build_spec.rb
index 7f39aff7639..13928695ccb 100644
--- a/spec/models/build_spec.rb
+++ b/spec/models/build_spec.rb
@@ -403,7 +403,7 @@ describe Ci::Build, models: true do
             })
           end
           let(:variables) do
-            [{ key: :KEY, value: 'value', public: true }]
+            [{ key: 'KEY', value: 'value', public: true }]
           end
 
           it { is_expected.to eq(predefined_variables + variables) }