test: Add unit tests

packages/mermaid/src/diagrams/packet/db.ts

@@ -67,7 +67,9 @@ export const populate = ({ blocks }: { blocks: Block[] }) => {
     }
     if (start != lastByte + 1) {
       throw new Error(
-        `Packet block ${start} - ${end} is not contiguous. It should start from ${lastByte + 1}.`
+        `Packet block ${start} - ${end ?? start} is not contiguous. It should start from ${
+          lastByte + 1
+        }.`
       );
     }
     lastByte = end ?? start;

packages/mermaid/src/diagrams/packet/packet.spec.ts

@@ -1,31 +1,183 @@
 import { parser } from './parser.js';
+import { clear, getPacket } from './db.js';
+describe('packet diagrams', () => {
+  beforeEach(() => {
+    clear();
+  });
+
+  it('should handle a packet-beta definition', () => {
+    const str = `packet-beta`;
+    expect(() => {
+      parser.parse(str);
+    }).not.toThrow();
+    expect(getPacket()).toMatchInlineSnapshot('[]');
+  });
+
+  it('should handle diagram with data', () => {
+    const str = `packet-beta
+    0-10: "test"
+    `;
+    expect(() => {
+      parser.parse(str);
+    }).not.toThrow();
+    expect(getPacket()).toMatchInlineSnapshot(`
+      [
+        [
+          {
+            "end": 10,
+            "label": "test",
+            "start": 0,
+          },
+        ],
+      ]
+    `);
+  });
+
+  it('should handle single bits', () => {
+    const str = `packet-beta
+    0-10: "test"
+    11: "single"
+    `;
+    expect(() => {
+      parser.parse(str);
+    }).not.toThrow();
+    expect(getPacket()).toMatchInlineSnapshot(`
+      [
+        [
+          {
+            "end": 10,
+            "label": "test",
+            "start": 0,
+          },
+          {
+            "end": 11,
+            "label": "single",
+            "start": 11,
+          },
+        ],
+      ]
+    `);
+  });
 
-describe('info', () => {
-  it('should handle an info definition', () => {
-    const str = `info`;
+  it('should split into multiple rows', () => {
+    const str = `packet-beta
+    0-10: "test"
+    11-90: "multiple"
+    `;
     expect(() => {
       parser.parse(str);
     }).not.toThrow();
+    expect(getPacket()).toMatchInlineSnapshot(`
+      [
+        [
+          {
+            "end": 10,
+            "label": "test",
+            "start": 0,
+          },
+          {
+            "end": 31,
+            "label": "multiple",
+            "start": 11,
+          },
+        ],
+        [
+          {
+            "end": 63,
+            "label": "multiple",
+            "start": 32,
+          },
+        ],
+        [
+          {
+            "end": 90,
+            "label": "multiple",
+            "start": 64,
+          },
+        ],
+      ]
+    `);
   });
 
-  it('should handle an info definition with showInfo', () => {
-    const str = `info showInfo`;
+  it('should split into multiple rows when cut at exact length', () => {
+    const str = `packet-beta
+    0-16: "test"
+    17-63: "multiple"
+    `;
     expect(() => {
       parser.parse(str);
     }).not.toThrow();
+    expect(getPacket()).toMatchInlineSnapshot(`
+      [
+        [
+          {
+            "end": 16,
+            "label": "test",
+            "start": 0,
+          },
+          {
+            "end": 31,
+            "label": "multiple",
+            "start": 17,
+          },
+        ],
+        [
+          {
+            "end": 63,
+            "label": "multiple",
+            "start": 32,
+          },
+        ],
+      ]
+    `);
+  });
+
+  it('should throw error if numbers are not continuous', () => {
+    const str = `packet-beta
+    0-16: "test"
+    18-20: "error"
+    `;
+    expect(() => {
+      parser.parse(str);
+    }).toThrowErrorMatchingInlineSnapshot(
+      '"Packet block 18 - 20 is not contiguous. It should start from 17."'
+    );
+  });
+
+  it('should throw error if numbers are not continuous for single packets', () => {
+    const str = `packet-beta
+    0-16: "test"
+    18: "error"
+    `;
+    expect(() => {
+      parser.parse(str);
+    }).toThrowErrorMatchingInlineSnapshot(
+      '"Packet block 18 - 18 is not contiguous. It should start from 17."'
+    );
   });
 
-  it('should throw because of unsupported info grammar', () => {
-    const str = `info unsupported`;
+  it('should throw error if numbers are not continuous for single packets - 2', () => {
+    const str = `packet-beta
+    0-16: "test"
+    17: "good"
+    19: "error"
+    `;
     expect(() => {
       parser.parse(str);
-    }).toThrow('Parsing failed: unexpected character: ->u<- at offset: 5, skipped 11 characters.');
+    }).toThrowErrorMatchingInlineSnapshot(
+      '"Packet block 19 - 19 is not contiguous. It should start from 18."'
+    );
   });
 
-  it('should throw because of unsupported info grammar', () => {
-    const str = `info unsupported`;
+  it('should throw error if end is less than start', () => {
+    const str = `packet-beta
+    0-16: "test"
+    25-20: "error"
+    `;
     expect(() => {
       parser.parse(str);
-    }).toThrow('Parsing failed: unexpected character: ->u<- at offset: 5, skipped 11 characters.');
+    }).toThrowErrorMatchingInlineSnapshot(
+      '"Packet block 25 - 20 is invalid. End must be greater than start."'
+    );
   });
 });