test: Add rendering tests

cypress/integration/rendering/packet.spec.ts

@@ -0,0 +1,65 @@
+import { imgSnapshotTest, renderGraph } from '../../helpers/util';
+
+describe('packet structure', () => {
+  it('should render a simple packet diagram', () => {
+    imgSnapshotTest(
+      `packet-beta
+  0-10: "hello"
+`
+    );
+  });
+
+  it('should render a complex packet diagram', () => {
+    imgSnapshotTest(
+      `packet-beta
+        0-15: "Source Port"
+        16-31: "Destination Port"
+        32-63: "Sequence Number"
+        64-95: "Acknowledgment Number"
+        96-99: "Data Offset"
+        100-105: "Reserved"
+        106: "URG"
+        107: "ACK"
+        108: "PSH"
+        109: "RST"
+        110: "SYN"
+        111: "FIN"
+        112-127: "Window"
+        128-143: "Checksum"
+        144-159: "Urgent Pointer"
+        160-191: "(Options and Padding)"
+        192-223: "data"
+      `
+    );
+  });
+
+  it('should render a complex packet diagram with showBits false', () => {
+    imgSnapshotTest(
+      `
+      ---
+      config:
+        packet:
+          showBits: false
+      ---
+      packet-beta
+        0-15: "Source Port"
+        16-31: "Destination Port"
+        32-63: "Sequence Number"
+        64-95: "Acknowledgment Number"
+        96-99: "Data Offset"
+        100-105: "Reserved"
+        106: "URG"
+        107: "ACK"
+        108: "PSH"
+        109: "RST"
+        110: "SYN"
+        111: "FIN"
+        112-127: "Window"
+        128-143: "Checksum"
+        144-159: "Urgent Pointer"
+        160-191: "(Options and Padding)"
+        192-223: "data"
+      `
+    );
+  });
+});