1 files changed, 78 insertions, 0 deletions
diff --git a/spec/frontend/ci/ci_variable_list/utils_spec.js b/spec/frontend/ci/ci_variable_list/utils_spec.js
new file mode 100644
index 00000000000..beeae71376a
--- /dev/null
+++ b/spec/frontend/ci/ci_variable_list/utils_spec.js
@@ -0,0 +1,78 @@
+import {
+  createJoinedEnvironments,
+  convertEnvironmentScope,
+  mapEnvironmentNames,
+} from '~/ci/ci_variable_list/utils';
+import { allEnvironments } from '~/ci/ci_variable_list/constants';
+
+describe('utils', () => {
+  const environments = ['dev', 'prod'];
+  const newEnvironments = ['staging'];
+
+  describe('createJoinedEnvironments', () => {
+    it('returns only `environments` if `variables` argument is undefined', () => {
+      const variables = undefined;
+
+      expect(createJoinedEnvironments(variables, environments, [])).toEqual(environments);
+    });
+
+    it('returns a list of environments and environment scopes taken from variables in alphabetical order', () => {
+      const envScope1 = 'new1';
+      const envScope2 = 'new2';
+
+      const variables = [{ environmentScope: envScope1 }, { environmentScope: envScope2 }];
+
+      expect(createJoinedEnvironments(variables, environments, [])).toEqual([
+        environments[0],
+        envScope1,
+        envScope2,
+        environments[1],
+      ]);
+    });
+
+    it('returns combined list with new environments included', () => {
+      const variables = undefined;
+
+      expect(createJoinedEnvironments(variables, environments, newEnvironments)).toEqual([
+        ...environments,
+        ...newEnvironments,
+      ]);
+    });
+
+    it('removes duplicate environments', () => {
+      const envScope1 = environments[0];
+      const envScope2 = 'new2';
+
+      const variables = [{ environmentScope: envScope1 }, { environmentScope: envScope2 }];
+
+      expect(createJoinedEnvironments(variables, environments, [])).toEqual([
+        environments[0],
+        envScope2,
+        environments[1],
+      ]);
+    });
+  });
+
+  describe('convertEnvironmentScope', () => {
+    it('converts the * to the `All environments` text', () => {
+      expect(convertEnvironmentScope('*')).toBe(allEnvironments.text);
+    });
+
+    it('returns the environment as is if not the *', () => {
+      expect(convertEnvironmentScope('prod')).toBe('prod');
+    });
+  });
+
+  describe('mapEnvironmentNames', () => {
+    const envName = 'dev';
+    const envName2 = 'prod';
+
+    const nodes = [
+      { name: envName, otherProp: {} },
+      { name: envName2, otherProp: {} },
+    ];
+    it('flatten a nodes array with only their names', () => {
+      expect(mapEnvironmentNames(nodes)).toEqual([envName, envName2]);
+    });
+  });
+});