diff --git a/cmd/browse/node_test.go b/cmd/browse/node_test.go
new file mode 100644
index 0000000..34e5fde
--- /dev/null
+++ b/cmd/browse/node_test.go
@@ -0,0 +1,72 @@
+package browse
+
+import (
+	"testing"
+)
+
+func TestCanAddAndRetrieveChild(t *testing.T) {
+	n := node{}
+	c1 := node{name: "C1", size: 100, isDir: false}
+	c2 := node{name: "C2", size: 200, isDir: false}
+	c3 := node{name: "C3", isDir: true}
+
+	n.addChild(&c1)
+	n.addChild(&c2)
+	n.addChild(&c3)
+
+	if len(n.children) != 3 {
+		t.Fatalf("Expected node to have 2 children, found %d", len(n.children))
+	}
+	if n.size != 300 {
+		t.Fatalf("Expected node to have size of %d, found %d", 300, n.size)
+	}
+	if !n.hasChild("C1") || !n.hasChild("C2") {
+		t.Fatalf("Expected node to have children C1 and C2")
+	}
+	if n.hasChild("C4") {
+		t.Fatalf("Expected node to not have child C4")
+	}
+	if c, ok := n.getChild("C1"); &c1 != c || !ok {
+		t.Fatalf("Expected node to have child C1")
+	}
+	if c, ok := n.getChild("C4"); c != nil || ok {
+		t.Fatalf("Expected node to not have child C4")
+	}
+}
+
+func TestCalculateSizeCorrectly(t *testing.T) {
+	n := node{name: "R"}
+	c1 := node{name: "C1", size: 100, isDir: false}
+	c2 := node{name: "C2", size: 200, isDir: false}
+	c3 := node{name: "C3", isDir: true}
+	c31 := node{name: "C31", size: 300, isDir: false}
+	c32 := node{name: "C32", size: 400, isDir: false}
+	c33 := node{name: "C33", isDir: true}
+	c331 := node{name: "C331", size: 500, isDir: false}
+	c332 := node{name: "C332", size: 600, isDir: false}
+	c333 := node{name: "C333", isDir: true}
+
+	n.addChild(&c1)
+	n.addChild(&c2)
+	n.addChild(&c3)
+	c3.addChild(&c31)
+	c3.addChild(&c32)
+	c3.addChild(&c33)
+	c33.addChild(&c331)
+	c33.addChild(&c332)
+	c33.addChild(&c333)
+
+	c33.recalculateSize()
+	c3.recalculateSize()
+	n.recalculateSize()
+
+	if c33.size != 1100 {
+		t.Fatalf("Expected child node c33 to have size of %d, found %d", 1100, c33.size)
+	}
+	if c3.size != 1800 {
+		t.Fatalf("Expected child node c3 to have size of %d, found %d", 1800, c33.size)
+	}
+	if n.size != 2100 {
+		t.Fatalf("Expected root node to have size of %d, found %d", 2100, c33.size)
+	}
+}