stdlib/bats: implemented integration tests

Signed-off-by: Sam Alba <samalba@users.noreply.github.com>

stdlib/bats/tests/bats.cue

@@ -0,0 +1,7 @@
+package main
+
+import (
+    "alpha.dagger.io/bats"
+)
+
+TestBats: bats.#Bats

stdlib/bats/tests/testfile/package-lock.json

@@ -0,0 +1,37 @@
+{
+  "name": "npm",
+  "lockfileVersion": 2,
+  "requires": true,
+  "packages": {
+    "": {
+      "dependencies": {
+        "bats-assert": "^2.0.0",
+        "bats-support": "^0.2.0"
+      }
+    },
+    "node_modules/bats-assert": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/bats-assert/-/bats-assert-2.0.0.tgz",
+      "integrity": "sha512-qO3kNilWxW8iCONu9NDUfvsCiC6JzL6DPOc/DGq9z3bZ9/A7wURJ+FnFMxGbofOmWbCoy7pVhofn0o47A95qkQ==",
+      "peerDependencies": {
+        "bats-support": "git+https://github.com/ztombol/bats-support.git#v0.2.0"
+      }
+    },
+    "node_modules/bats-support": {
+      "version": "0.2.0",
+      "resolved": "git+ssh://git@github.com/ztombol/bats-support.git#d0a131831c487a1f1141e76d3ab386c89642cdff"
+    }
+  },
+  "dependencies": {
+    "bats-assert": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/bats-assert/-/bats-assert-2.0.0.tgz",
+      "integrity": "sha512-qO3kNilWxW8iCONu9NDUfvsCiC6JzL6DPOc/DGq9z3bZ9/A7wURJ+FnFMxGbofOmWbCoy7pVhofn0o47A95qkQ==",
+      "requires": {}
+    },
+    "bats-support": {
+      "version": "git+ssh://git@github.com/ztombol/bats-support.git#d0a131831c487a1f1141e76d3ab386c89642cdff",
+      "from": "bats-support@*"
+    }
+  }
+}

stdlib/bats/tests/testfile/package.json

@@ -0,0 +1,6 @@
+{
+  "dependencies": {
+    "bats-assert": "^2.0.0",
+    "bats-support": "^0.2.0"
+  }
+}

stdlib/bats/tests/testfile/test.bats

@@ -0,0 +1,12 @@
+setup() {
+    load 'node_modules/bats-support/load'
+    load 'node_modules/bats-assert/load'
+}
+
+@test "simple bats test" {
+    run echo "Hello world"
+    assert_success
+
+    run cat /do/not/exist
+    assert_failure
+}