Improve test names to accurately reflect what is being tested

Co-authored-by: taylortom <1059083+taylortom@users.noreply.github.com>

Author: Copilot

tests/AbstractMailTransport.spec.js

@@ -15,7 +15,7 @@ describe('AbstractMailTransport', () => {
   })
 
   describe('module structure', () => {
-    it('should have valid JavaScript syntax', () => {
+    it('should contain AbstractMailTransport class definition', () => {
       assert.ok(content.length > 0)
       assert.ok(content.includes('class AbstractMailTransport'))
     })

tests/FilesystemTransport.spec.js

@@ -15,7 +15,7 @@ describe('FilesystemTransport', () => {
   })
 
   describe('module structure', () => {
-    it('should have valid JavaScript syntax', () => {
+    it('should contain FilesystemTransport class definition', () => {
       assert.ok(content.length > 0)
       assert.ok(content.includes('class FilesystemTransport'))
     })

tests/MailerModule.spec.js

@@ -15,7 +15,7 @@ describe('MailerModule', () => {
   })
 
   describe('module structure', () => {
-    it('should have valid JavaScript syntax', () => {
+    it('should contain MailerModule class definition', () => {
       assert.ok(content.length > 0)
       assert.ok(content.includes('class MailerModule'))
     })

tests/SmtpTransport.spec.js

@@ -15,7 +15,7 @@ describe('SmtpTransport', () => {
   })
 
   describe('module structure', () => {
-    it('should have valid JavaScript syntax', () => {
+    it('should contain SmtpTransport class definition', () => {
       assert.ok(content.length > 0)
       assert.ok(content.includes('class SmtpTransport'))
     })