Write first test for deps

task_test.go

@@ -0,0 +1,45 @@
+package task_test
+
+import (
+	"os"
+	"os/exec"
+	"path/filepath"
+	"testing"
+)
+
+func TestDeps(t *testing.T) {
+	const dir = "testdata/deps"
+
+	files := []string{
+		"d1.txt",
+		"d2.txt",
+		"d3.txt",
+		"d11.txt",
+		"d12.txt",
+		"d13.txt",
+		"d21.txt",
+		"d22.txt",
+		"d23.txt",
+		"d31.txt",
+		"d32.txt",
+		"d33.txt",
+	}
+
+	for _, f := range files {
+		_ = os.Remove(f)
+	}
+
+	c := exec.Command("task")
+	c.Dir = dir
+	if err := c.Run(); err != nil {
+		t.Error(err)
+		return
+	}
+
+	for _, f := range files {
+		f = filepath.Join(dir, f)
+		if _, err := os.Stat(f); err != nil {
+			t.Errorf("File %s should exists", f)
+		}
+	}
+}