Add test case for 'odo dev' when a project with no source code is use…

…d with no 'metadata.name' in the Devfile

The rationale behind this is to purposely make
the Alizer library unable to detect the project.
Per the requirements, this would force us to use the project
directory name as component name.

This highlights an interesting behavior if the project
directory name is all-numeric (as is the case in our tests);
our sanitization logic automatically prepends an "x" prefix
to the directory name, so it can be used as a valid name
for the component.

tests/examples/source/devfiles/nodejs/devfile-no-metadata-name.yaml

@@ -0,0 +1,49 @@
+schemaVersion: 2.0.0
+metadata:
+  projectType: nodejs
+  language: nodejs
+starterProjects:
+  - name: nodejs-starter
+    git:
+      remotes:
+        origin: "https://github.com/odo-devfiles/nodejs-ex.git"
+components:
+  - name: runtime
+    container:
+      image: registry.access.redhat.com/ubi8/nodejs-12:1-36
+      memoryLimit: 1024Mi
+      endpoints:
+        - name: "3000-tcp"
+          targetPort: 3000
+      mountSources: true
+commands:
+  - id: devbuild
+    exec:
+      component: runtime
+      commandLine: npm install
+      workingDir: ${PROJECTS_ROOT}
+      group:
+        kind: build
+        isDefault: true
+  - id: build
+    exec:
+      component: runtime
+      commandLine: npm install
+      workingDir: ${PROJECTS_ROOT}
+      group:
+        kind: build
+  - id: devrun
+    exec:
+      component: runtime
+      commandLine: npm start
+      workingDir: ${PROJECTS_ROOT}
+      group:
+        kind: run
+        isDefault: true
+  - id: run
+    exec:
+      component: runtime
+      commandLine: npm start
+      workingDir: ${PROJECTS_ROOT}
+      group:
+        kind: run

tests/integration/cmd_dev_test.go

@@ -2477,4 +2477,44 @@ CMD ["npm", "start"]
 			})
 		})
 	})
+
+	Describe("Devfile with no metadata.name", func() {
+
+		BeforeEach(func() {
+			helper.CopyExampleDevFile(filepath.Join("source", "devfiles", "nodejs", "devfile-no-metadata-name.yaml"),
+				filepath.Join(commonVar.Context, "devfile.yaml"))
+		})
+
+		When("running odo dev against a component with no source code", func() {
+			var devSession helper.DevSession
+			BeforeEach(func() {
+				var err error
+				devSession, _, _, _, err = helper.StartDevMode(nil)
+				Expect(err).ToNot(HaveOccurred())
+			})
+
+			AfterEach(func() {
+				devSession.Stop()
+			})
+
+			It("should use the directory as component name", func() {
+				// when no further source code is available, directory name is returned by alizer.DetectName as component name;
+				// and since it is all-numeric in our tests, an "x" prefix is added by util.GetDNS1123Name (called by alizer.DetectName)
+				cmpName := "x" + filepath.Base(commonVar.Context)
+				commonVar.CliRunner.CheckCmdOpInRemoteDevfilePod(
+					commonVar.CliRunner.GetRunningPodNameByComponent(cmpName, commonVar.Project),
+					"runtime",
+					commonVar.Project,
+					[]string{
+						remotecmd.ShellExecutable, "-c",
+						fmt.Sprintf("cat %s/.odo_cmd_devrun.pid", strings.TrimSuffix(storage.SharedDataMountPath, "/")),
+					},
+					func(stdout string, err error) bool {
+						Expect(err).ShouldNot(HaveOccurred())
+						Expect(stdout).NotTo(BeEmpty())
+						return err == nil
+					})
+			})
+		})
+	})
 })