add error-path tests for command execution

Author: lstreckeisen

test/commands/CommandExecution.test.ts

@@ -18,7 +18,10 @@ beforeAll(() => {
 
 afterEach(async () => {
   await clearDocuments(services.shared, services.shared.workspace.LangiumDocuments.all.toArray())
-  fs.rmSync(outDir, { recursive: true })
+  fs.rmSync(outDir, {
+    recursive: true,
+    force: true
+  })
 })
 
 describe('Command execution tests', () => {
@@ -31,4 +34,34 @@ describe('Command execution tests', () => {
     const outContent = fs.readdirSync(outDir)
     expect(outContent).toHaveLength(1)
   })
+
+  test('test plantUML command with invalid file extension', async () => {
+    const file = path.join(__dirname, '..', 'invalid-files', 'test.txt')
+
+    const result = await commandHandler.executeCommand('org.contextmapper.GeneratePlantUML', [file, outDir])
+    expect(result).toBeUndefined()
+
+    const outContentExists = fs.existsSync(outDir)
+    expect(outContentExists).toEqual(false)
+  })
+
+  test('test plantUML command with invalid file', async () => {
+    const file = path.join(__dirname, '..', 'invalid-files', 'invalid.cml')
+
+    const result = await commandHandler.executeCommand('org.contextmapper.GeneratePlantUML', [file, outDir])
+    expect(result).toBeUndefined()
+
+    const outContentExists = fs.existsSync(outDir)
+    expect(outContentExists).toEqual(false)
+  })
+
+  test('test plantUML command with non-existing file', async () => {
+    const file = path.join(__dirname, '..', 'invalid-files', 'non-existing.cml')
+
+    const result = await commandHandler.executeCommand('org.contextmapper.GeneratePlantUML', [file, outDir])
+    expect(result).toBeUndefined()
+
+    const outContentExists = fs.existsSync(outDir)
+    expect(outContentExists).toEqual(false)
+  })
 })

test/invalid-files/invalid.cml

@@ -0,0 +1,5 @@
+ContextMap {
+    contains TestContext
+}
+
+BoundedContext TestContext {

test/invalid-files/test.txt

@@ -0,0 +1 @@
+Invalid file extension