Add integration tests

Makefile

@@ -1,4 +1,10 @@
-.PHONY: build rebuild test tag pull login push enter
+ifneq (,)
+.error This Makefile requires GNU Make.
+endif
+
+.PHONY: build rebuild test _test_version _test_run tag pull login push enter
+
+CURRENT_DIR = $(dir $(abspath $(lastword $(MAKEFILE_LIST))))
 
 DIR = .
 FILE = Dockerfile
@@ -12,6 +18,13 @@ rebuild: pull
 	docker build --no-cache --build-arg VERSION=$(TAG) -t $(IMAGE) -f $(DIR)/$(FILE) $(DIR)
 
 test:
+	@$(MAKE) --no-print-directory _test_version
+	@$(MAKE) --no-print-directory _test_run
+
+_test_version:
+	@echo "------------------------------------------------------------"
+	@echo "- Testing correct version"
+	@echo "------------------------------------------------------------"
 	@if [ "$(TAG)" = "latest" ]; then \
 		echo "Fetching latest version from GitHub"; \
 		LATEST="$$( \
@@ -22,11 +35,28 @@ test:
 				| sed 's/.*v//g' \
 		)"; \
 		echo "Testing for latest: $${LATEST}"; \
-		docker run --rm $(IMAGE) --version | grep -E "^v?$${LATEST}$$"; \
+		if ! docker run --rm $(IMAGE) --version | grep -E "^v?$${LATEST}$$"; then \
+			echo "Failed"; \
+			exit 1; \
+		fi; \
 	else \
 		echo "Testing for tag: $(TAG)"; \
-		docker run --rm $(IMAGE) --version | grep -E "^v?$(TAG)[.0-9]+$$"; \
-	fi
+		if ! docker run --rm $(IMAGE) --version | grep -E "^v?$(TAG)[.0-9]+$$"; then \
+			echo "Failed"; \
+			exit 1; \
+		fi; \
+	fi; \
+	echo "Success"; \
+
+_test_run:
+	@echo "------------------------------------------------------------"
+	@echo "- Testing javascript files "
+	@echo "------------------------------------------------------------"
+	@if ! docker run --rm -v $(CURRENT_DIR)/tests:/data $(IMAGE) . ; then \
+		echo "Failed"; \
+		exit 1; \
+	fi; \
+	echo "Success";
 
 tag:
 	docker tag $(IMAGE) $(IMAGE):$(TAG)

README.md

@@ -32,7 +32,7 @@ The image is built nightly against multiple stable versions and pushed to Docker
 
 | Docker tag | Build from |
 |------------|------------|
-| `latest`   | [Branch: master](https://github.com/eslint/eslint) |
+| `latest`   | Latest stable version |
 | `5`        | Tag: v5.x.x |
 | `4`        | Tag: v4.x.x |
 | `3`        | Tag: v3.x.x |

tests/.eslintrc

@@ -0,0 +1,9 @@
+{
+    "parserOptions": {
+        "ecmaVersion": 2017
+    },
+
+    "env": {
+        "es6": true
+    }
+}

tests/node.js

@@ -0,0 +1,6 @@
+var http = require('http');
+
+http.createServer(function (req, res) {
+  res.writeHead(200, {'Content-Type': 'text/plain'});
+  res.end('Hello World!');
+}).listen(8080);