chore: Added shared tests and templates for plugins

tests/plugins/shared.mjs

@@ -0,0 +1,42 @@
+import freesewing from '@freesewing/core'
+import chai from 'chai'
+/*
+ * This runs unit tests for the plugin configuration
+ * It expects the following:
+ *
+ * @param object plugin: The plugin object
+ * @param object freesewing: Imported @freesewing/core
+ * @param object expect: Imported chai.expect
+ */
+export const sharedPluginTests = plugin => {
+
+  describe('Shared Plugin Tests', () => {
+    it('Should have a name property', () => {
+      chai.expect(typeof plugin.name).to.equal('string')
+      chai.expect(plugin.name.length).to.be.greaterThan(2)
+    })
+    it('Should have a version property', () => {
+      chai.expect(typeof plugin.version).to.equal('string')
+      chai.expect(plugin.version.length).to.be.greaterThan(2)
+    })
+    it('Version should be a proper semantic version', () => {
+      chai.expect(plugin.version.split('.').length).to.equal(3)
+    })
+
+    if ([
+      // These don't set their version
+      '@freesewing/plugin-versionfree-svg',
+      '@freesewing/plugin-bundle',
+    ].indexOf(plugin.name) === -1) {
+      const pattern = new freesewing.Pattern().use(plugin)
+      pattern.draft().render()
+      const version = plugin.name.split('@').pop().split('/').join(':')
+
+      it('Should set the plugin name:version attribute', () => {
+        chai.expect(pattern.svg.attributes.get(version)).to.equal(plugin.version)
+      })
+    }
+  })
+
+}
+