test: Add unit tests for formatSize function in channelMap

Author: gajeshbhat

static/js/public/snap-details/channelMap.test.ts

@@ -0,0 +1,66 @@
+import ChannelMap from "./channelMap";
+
+describe("ChannelMap", () => {
+  describe("formatSize", () => {
+    let channelMap: ChannelMap;
+
+    beforeEach(() => {
+      // Create a minimal DOM structure for ChannelMap initialization
+      document.body.innerHTML = `
+        <div data-js="channel-map"></div>
+        <div class="p-channel-map-overlay" data-js="close-channel-map"></div>
+        <script type="text/template" id="channel-map-row-template"></script>
+        <script type="text/template" id="channel-map-security-table-row-template"></script>
+      `;
+      channelMap = new ChannelMap(
+        '[data-js="channel-map"]',
+        "test-snap",
+        "test-snap-id",
+        {},
+        "latest",
+        false,
+      );
+    });
+
+    afterEach(() => {
+      document.body.innerHTML = "";
+    });
+
+    it("should format 0 bytes correctly", () => {
+      expect(channelMap.formatSize(0)).toBe("0 B");
+    });
+
+    it("should format bytes correctly", () => {
+      expect(channelMap.formatSize(500)).toBe("500 B");
+      expect(channelMap.formatSize(999)).toBe("999 B");
+    });
+
+    it("should format kilobytes correctly", () => {
+      expect(channelMap.formatSize(1000)).toBe("1 kB");
+      expect(channelMap.formatSize(1500)).toBe("1.5 kB");
+      expect(channelMap.formatSize(50000)).toBe("50 kB");
+    });
+
+    it("should format megabytes correctly", () => {
+      expect(channelMap.formatSize(1000000)).toBe("1 MB");
+      expect(channelMap.formatSize(1500000)).toBe("1.5 MB");
+      expect(channelMap.formatSize(52428800)).toBe("52.4 MB");
+    });
+
+    it("should format gigabytes correctly", () => {
+      expect(channelMap.formatSize(1000000000)).toBe("1 GB");
+      expect(channelMap.formatSize(1500000000)).toBe("1.5 GB");
+      expect(channelMap.formatSize(5000000000)).toBe("5 GB");
+    });
+
+    it("should format terabytes correctly", () => {
+      expect(channelMap.formatSize(1000000000000)).toBe("1 TB");
+      expect(channelMap.formatSize(1500000000000)).toBe("1.5 TB");
+    });
+
+    it("should round to 1 decimal place", () => {
+      expect(channelMap.formatSize(1234567)).toBe("1.2 MB");
+      expect(channelMap.formatSize(1567890)).toBe("1.6 MB");
+    });
+  });
+});