Add additional tests

src/test/container-features/configs/image-with-local-feature/.devcontainer/devcontainer.json

@@ -4,5 +4,6 @@
 	"features": {
 		"./test-feature": {}
 	},
-	"remoteUser": "vscode"
+	"remoteUser": "vscode",
+	"postCreateCommand": "echo ${remoteUser} > /tmp/container.variable-substitution.testMarker"
 }

src/test/container-features/configs/image-with-local-feature/.devcontainer/test-feature/devcontainer-feature.json

@@ -11,5 +11,5 @@
 			"type": "volume"
 		}
 	],
-	"postCreateCommand": "/usr/bin/whoami && echo ${remoteUser} > /tmp/variable-substitution.testMarker"
+	"postCreateCommand": "/usr/bin/whoami && echo ${remoteUser} > /tmp/feature.variable-substitution.testMarker"
 }

src/test/container-features/lifecycleHooks.test.ts

@@ -390,15 +390,34 @@ describe('Feature lifecycle hooks', function () {
 			});
 
 			it('executes lifecycle hooks with variable substitution', async () => {
-				const res = await shellExec(`${cli} exec --workspace-folder ${testFolder} cat /tmp/variable-substitution.testMarker`);
-				assert.strictEqual(res.error, null);
+				const res1 = await shellExec(`${cli} exec --workspace-folder ${testFolder} cat /tmp/feature.variable-substitution.testMarker`);
+				assert.strictEqual(res1.error, null);
 
-				const outputOfExecCommand = res.stdout;
-				console.log(outputOfExecCommand);
+				const outputOfExecCommand1 = res1.stdout;
+				console.log(outputOfExecCommand1);
 
 				// Executes the command that was installed by the local Feature's 'postCreateCommand'.
-				assert.match(outputOfExecCommand, /vscode/);
+				assert.strictEqual(outputOfExecCommand1, 'vscode\n');
 				assert.match(containerUpStandardError, /Running the postCreateCommand from Feature '.\/test-feature/);
+
+				// substitutuin in main devcontainer.json
+				const res2 = await shellExec(`${cli} exec --workspace-folder ${testFolder} cat /tmp/container.variable-substitution.testMarker`);
+				assert.strictEqual(res2.error, null);
+
+				const outputOfExecCommand2 = res2.stdout;
+				console.log(outputOfExecCommand2);
+
+				// Executes the command that was installed by the local Feature's 'postCreateCommand'.
+				assert.strictEqual(outputOfExecCommand2, 'vscode\n');
+				assert.match(containerUpStandardError, /Running the postCreateCommand from devcontainer.json/);
+
+				// Check if substituted mount path is in use
+				const res3 = await shellExec(`docker inspect ${containerId} --format '{{json .Mounts}}'`);
+				assert.strictEqual(res3.error, null);
+
+				// json parse res3
+				const mounts = JSON.parse(res3.stdout);
+				assert.exists(mounts.find((item: { Type: string; Destination: string }) => item.Type === 'volume' && item.Destination === '/home/vscode'));
 			});
 		});
 	});