diff --git a/src/utils.test.js b/src/utils.test.js
new file mode 100644
index 0000000..2b33e2e
--- /dev/null
+++ b/src/utils.test.js
@@ -0,0 +1,71 @@
+import { getBandInformation } from './utils'
+
+describe('utils', () => {
+  describe('getBandInformation()', () => {
+    it('returns no bands for empty selectors', () => {
+      expect(getBandInformation({})).toEqual({})
+    })
+
+    it('returns no bands for non-array selector values', () => {
+      expect(getBandInformation({ time: 0 })).toEqual({})
+      expect(getBandInformation({ time: 0, variable: 'pr' })).toEqual({})
+    })
+
+    it('handles array selector values', () => {
+      expect(getBandInformation({ time: ['jan', 'feb'] })).toEqual({
+        jan: { time: 'jan' },
+        feb: { time: 'feb' },
+      })
+    })
+
+    it('handles array selector values with number entries', () => {
+      expect(getBandInformation({ time: [1, 2] })).toEqual({
+        time_1: { time: 1 },
+        time_2: { time: 2 },
+      })
+    })
+
+    it('handles multiple array selector values', () => {
+      expect(
+        getBandInformation({ time: ['jan', 'feb'], variable: ['pr', 'tavg'] })
+      ).toEqual({
+        jan_pr: { time: 'jan', variable: 'pr' },
+        feb_pr: { time: 'feb', variable: 'pr' },
+        jan_tavg: { time: 'jan', variable: 'tavg' },
+        feb_tavg: { time: 'feb', variable: 'tavg' },
+      })
+    })
+
+    it('handles multiple array selector values with number entries', () => {
+      expect(
+        getBandInformation({ time: [1, 2], variable: ['pr', 'tavg'] })
+      ).toEqual({
+        time_1_pr: { time: 1, variable: 'pr' },
+        time_2_pr: { time: 2, variable: 'pr' },
+        time_1_tavg: { time: 1, variable: 'tavg' },
+        time_2_tavg: { time: 2, variable: 'tavg' },
+      })
+      expect(getBandInformation({ time: [1, 2], variable: [3, 4] })).toEqual({
+        time_1_variable_3: { time: 1, variable: 3 },
+        time_2_variable_3: { time: 2, variable: 3 },
+        time_1_variable_4: { time: 1, variable: 4 },
+        time_2_variable_4: { time: 2, variable: 4 },
+      })
+    })
+
+    it('handles mix of array selector values with non-array selector values', () => {
+      expect(
+        getBandInformation({ time: ['jan', 'feb'], variable: 'pr' })
+      ).toEqual({
+        jan: { time: 'jan', variable: 'pr' },
+        feb: { time: 'feb', variable: 'pr' },
+      })
+      expect(getBandInformation({ time: ['jan', 'feb'], variable: 3 })).toEqual(
+        {
+          jan: { time: 'jan', variable: 3 },
+          feb: { time: 'feb', variable: 3 },
+        }
+      )
+    })
+  })
+})