Refine purl parsing and tests

__tests__/config.test.ts

@@ -57,13 +57,15 @@ test('it raises an error if an empty allow list is specified', async () => {
 test('it raises an error when an invalid package-url is used for deny-packages', async () => {
   setInput('deny-packages', 'not-a-purl')
 
-  await expect(readConfig()).rejects.toThrow(`Error parsing purl`)
+  await expect(readConfig()).rejects.toThrow(`Error parsing package-url`)
 })
 
 test('it raises an error when an argument to deny-groups is missing a namespace', async () => {
   setInput('deny-groups', 'pkg:npm/my-fun-org')
 
-  await expect(readConfig()).rejects.toThrow(`purl must have a namespace`)
+  await expect(readConfig()).rejects.toThrow(
+    `package-url must have a namespace`
+  )
 })
 
 test('it raises an error when given an unknown severity', async () => {

__tests__/purl.test.ts

@@ -4,20 +4,20 @@ import {parsePURL} from '../src/purl'
 test('parsePURL returns an error if the purl does not start with "pkg:"', () => {
   const purl = 'not-a-purl'
   const result = parsePURL(purl)
-  expect(result.error).toEqual('purl must start with "pkg:"')
+  expect(result.error).toEqual('package-url must start with "pkg:"')
 })
 
-test('parsePURL returns an error if the purl does not contain an ecosystem', () => {
+test('parsePURL returns an error if the purl does not contain a type', () => {
   const purl = 'pkg:/'
   const result = parsePURL(purl)
-  expect(result.error).toEqual('purl must contain an ecosystem')
+  expect(result.error).toEqual('package-url must contain a type')
 })
 
 test('parsePURL returns an error if the purl does not contain a namespace or name', () => {
   const purl = 'pkg:ecosystem/'
   const result = parsePURL(purl)
   expect(result.type).toEqual('ecosystem')
-  expect(result.error).toEqual('purl must contain a namespace or name')
+  expect(result.error).toEqual('package-url must contain a namespace or name')
 })
 
 test('parsePURL returns a PURL with the correct values in the happy case', () => {
@@ -88,6 +88,28 @@ test('parsePURL table test', () => {
         error: null
       }
     },
+    {
+      purl: 'pkg:/?',
+      expected: {
+        type: '',
+        namespace: null,
+        name: null,
+        version: null,
+        original: 'pkg:/?',
+        error: 'package-url must contain a type'
+      }
+    },
+    {
+      purl: 'pkg:ecosystem/#',
+      expected: {
+        type: 'ecosystem',
+        namespace: null,
+        name: null,
+        version: null,
+        original: 'pkg:ecosystem/#',
+        error: 'package-url must contain a namespace or name'
+      }
+    },
     {
       purl: 'pkg:ecosystem/name@version#subpath?attributes=123',
       expected: {