1 files changed, 45 insertions, 0 deletions
diff --git a/spec/frontend/helpers/monitor_helper_spec.js b/spec/frontend/helpers/monitor_helper_spec.js
new file mode 100644
index 00000000000..2e8bff298c4
--- /dev/null
+++ b/spec/frontend/helpers/monitor_helper_spec.js
@@ -0,0 +1,45 @@
+import * as monitorHelper from '~/helpers/monitor_helper';
+
+describe('monitor helper', () => {
+  const defaultConfig = { default: true, name: 'default name' };
+  const name = 'data name';
+  const series = [[1, 1], [2, 2], [3, 3]];
+  const data = ({ metric = { default_name: name }, values = series } = {}) => [{ metric, values }];
+
+  describe('makeDataSeries', () => {
+    const expectedDataSeries = [
+      {
+        ...defaultConfig,
+        data: series,
+      },
+    ];
+
+    it('converts query results to data series', () => {
+      expect(monitorHelper.makeDataSeries(data({ metric: {} }), defaultConfig)).toEqual(
+        expectedDataSeries,
+      );
+    });
+
+    it('returns an empty array if no query results exist', () => {
+      expect(monitorHelper.makeDataSeries([], defaultConfig)).toEqual([]);
+    });
+
+    it('handles multi-series query results', () => {
+      const expectedData = { ...expectedDataSeries[0], name: 'default name: data name' };
+
+      expect(monitorHelper.makeDataSeries([...data(), ...data()], defaultConfig)).toEqual([
+        expectedData,
+        expectedData,
+      ]);
+    });
+
+    it('excludes NaN values', () => {
+      expect(
+        monitorHelper.makeDataSeries(
+          data({ metric: {}, values: [[1, 1], [2, NaN]] }),
+          defaultConfig,
+        ),
+      ).toEqual([{ ...expectedDataSeries[0], data: [[1, 1]] }]);
+    });
+  });
+});