diff --git a/_testdata/rootfind/manifest.json b/_testdata/rootfind/manifest.json
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/_testdata/rootfind/subdir/.gitkeep b/_testdata/rootfind/subdir/.gitkeep
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/main_test.go b/main_test.go
new file mode 100644
index 0000000000..fc65cb8a2e
--- /dev/null
+++ b/main_test.go
@@ -0,0 +1,42 @@
+package main
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+func TestFindRoot(t *testing.T) {
+	wd, err := os.Getwd()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	expect := filepath.Join(wd, "_testdata", "rootfind")
+
+	got1, err := findProjectRoot(expect)
+	if err != nil {
+		t.Errorf("Unexpected error while finding root: %s", err)
+	} else if expect != got1 {
+		t.Errorf("findProjectRoot directly on root dir should have found %s, got %s", expect, got1)
+	}
+
+	got2, err := findProjectRoot(filepath.Join(expect, "subdir"))
+	if err != nil {
+		t.Errorf("Unexpected error while finding root: %s", err)
+	} else if expect != got2 {
+		t.Errorf("findProjectRoot on subdir should have found %s, got %s", expect, got2)
+	}
+
+	got3, err := findProjectRoot(filepath.Join(expect, "nonexistent"))
+	if err != nil {
+		t.Errorf("Unexpected error while finding root: %s", err)
+	} else if expect != got3 {
+		t.Errorf("findProjectRoot on nonexistent subdir should still work and give %s, got %s", expect, got3)
+	}
+
+	got4, err := findProjectRoot(filepath.Join(expect, ManifestName))
+	if err == nil {
+		t.Errorf("Should have err'd when trying subdir of file, but returned %s", got4)
+	}
+}