revert cache test deletion

Author: bahrmichael

lib/batches/execution/cache/cache_test.go

@@ -0,0 +1,31 @@
+package cache
+
+import (
+	"encoding/json"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+
+	"github.com/sourcegraph/sourcegraph/lib/batches"
+	"github.com/sourcegraph/sourcegraph/lib/batches/env"
+)
+
+func TestKeyer_Key_PerRunEnvVarsIgnored(t *testing.T) {
+	var stepEnv env.Environment
+	require.NoError(t, json.Unmarshal(
+		[]byte(`["SRC_EXECUTOR_JOB_TOKEN", "SRC_EXECUTOR_JOB_ID", "SRC_EXECUTOR_NAME"]`),
+		&stepEnv,
+	))
+	step := batches.Step{Run: "foo", Env: stepEnv}
+	repo := batches.Repository{ID: "r", Name: "r"}
+
+	unset, err := (&CacheKey{Repository: repo, Steps: []batches.Step{step}, StepIndex: 0}).Key()
+	require.NoError(t, err)
+	resolved, err := (&CacheKey{Repository: repo, Steps: []batches.Step{step}, StepIndex: 0, GlobalEnv: []string{
+		"SRC_EXECUTOR_JOB_TOKEN=tok",
+		"SRC_EXECUTOR_JOB_ID=42",
+		"SRC_EXECUTOR_NAME=executor-abc",
+	}}).Key()
+	require.NoError(t, err)
+	require.Equal(t, unset, resolved)
+}