diff --git a/Taskfile.yml b/Taskfile.yml
index 9401a29c..70c45244 100644
--- a/Taskfile.yml
+++ b/Taskfile.yml
@@ -9,8 +9,8 @@ lint:
     - golint .
     - golint ./cmd/task
 
-# TODO: have tests
 test:
+  deps: [install]
   cmds:
     - go test -v
 
diff --git a/task_test.go b/task_test.go
new file mode 100644
index 00000000..0c6e5cba
--- /dev/null
+++ b/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)
+		}
+	}
+}
diff --git a/testdata/deps/.gitignore b/testdata/deps/.gitignore
new file mode 100644
index 00000000..2211df63
--- /dev/null
+++ b/testdata/deps/.gitignore
@@ -0,0 +1 @@
+*.txt
diff --git a/testdata/deps/Taskfile.yml b/testdata/deps/Taskfile.yml
new file mode 100644
index 00000000..dd82345c
--- /dev/null
+++ b/testdata/deps/Taskfile.yml
@@ -0,0 +1,53 @@
+default:
+  deps: [d1, d2, d3]
+
+d1:
+  deps: [d11, d12, d13]
+  cmds:
+    - echo 'Text' > d1.txt
+
+d2:
+  deps: [d21, d22, d23]
+  cmds:
+    - echo 'Text' > d2.txt
+
+d3:
+  deps: [d31, d32, d33]
+  cmds:
+    - echo 'Text' > d3.txt
+
+d11:
+  cmds:
+    - echo 'Text' > d11.txt
+
+d12:
+  cmds:
+    - echo 'Text' > d12.txt
+
+d13:
+  cmds:
+    - echo 'Text' > d13.txt
+
+d21:
+  cmds:
+    - echo 'Text' > d21.txt
+
+d22:
+  cmds:
+    - echo 'Text' > d22.txt
+
+d23:
+  cmds:
+    - echo 'Text' > d23.txt
+
+d31:
+  cmds:
+    - echo 'Text' > d31.txt
+
+d32:
+  cmds:
+    - echo 'Text' > d32.txt
+
+d33:
+  cmds:
+    - echo 'Text' > d33.txt