docker: cleanup tests

Signed-off-by: Solomon Hykes <solomon@dagger.io>

pkg/universe.dagger.io/docker/test/run.cue

@@ -0,0 +1,71 @@
+package docker
+
+import (
+	"dagger.io/dagger"
+	"dagger.io/dagger/engine"
+
+	"universe.dagger.io/docker"
+	"universe.dagger.io/alpine"
+)
+
+dagger.#Plan & {
+	actions: tests: run: {
+		_build: alpine.#Build
+		_image: _build.output
+
+		// Test: run a simple shell command
+		simpleShell: {
+			image: alpine.#Build
+
+			run: docker.#Run & {
+				image: _image
+				command: {
+					name: "/bin/sh"
+					args: ["-c", "echo -n hello world >> /output.txt"]
+				}
+			}
+
+			verify: engine.#ReadFile & {
+				input: run.output.rootfs
+				path:  "/output.txt"
+			}
+			verify: contents: "hello world"
+		}
+
+		// Test: export a file
+		exportFile: {
+			image: _image
+			command: {
+				name: "sh"
+				flags: "-c": #"""
+					echo -n hello world >> /output.txt
+					"""#
+			}
+			export: files: "/output.txt": _ & {
+				// Assert content
+				contents: "hello world"
+			}
+		}
+
+		// Test: export a directory
+		exportDirectory: {
+			run: docker.#Run & {
+				image: _image
+				command: {
+					name: "sh"
+					flags: "-c": #"""
+						mkdir -p /test
+						echo -n hello world >> /test/output.txt
+						"""#
+				}
+				export: directories: "/test": _
+			}
+
+			verify: engine.#ReadFile & {
+				input: run.export.directories."/test".contents
+				path:  "/output.txt"
+			}
+			verify: contents: "hello world"
+		}
+	}
+}