diff --git a/tests/test_history.py b/tests/test_history.py
new file mode 100644
index 0000000..a4139fe
--- /dev/null
+++ b/tests/test_history.py
@@ -0,0 +1,94 @@
+"""Tests for InputHistory."""
+
+from tuimble.app import InputHistory
+
+
+def test_empty_history_up_returns_none():
+    h = InputHistory()
+    assert h.up("current") is None
+
+
+def test_empty_history_down_returns_none():
+    h = InputHistory()
+    assert h.down() is None
+
+
+def test_push_then_up_returns_last():
+    h = InputHistory()
+    h.push("hello")
+    assert h.up("draft") == "hello"
+
+
+def test_up_twice_with_single_entry_stays():
+    h = InputHistory()
+    h.push("one")
+    assert h.up("draft") == "one"
+    assert h.up("draft") == "one"  # no older entry, stays put
+
+
+def test_up_navigates_backwards():
+    h = InputHistory()
+    h.push("first")
+    h.push("second")
+    h.push("third")
+    assert h.up("draft") == "third"
+    assert h.up("draft") == "second"
+    assert h.up("draft") == "first"
+    assert h.up("draft") == "first"  # clamped at oldest
+
+
+def test_down_navigates_forward():
+    h = InputHistory()
+    h.push("first")
+    h.push("second")
+    h.push("third")
+    h.up("draft")  # -> third
+    h.up("draft")  # -> second
+    assert h.down() == "third"
+
+
+def test_down_past_end_restores_draft():
+    h = InputHistory()
+    h.push("one")
+    h.up("my draft")  # -> one
+    result = h.down()  # -> back to draft
+    assert result == "my draft"
+
+
+def test_down_without_prior_up_returns_none():
+    h = InputHistory()
+    h.push("one")
+    assert h.down() is None
+
+
+def test_push_resets_navigation():
+    h = InputHistory()
+    h.push("first")
+    h.up("draft")  # -> first
+    h.push("second")
+    # After push, navigation resets -- up should go to newest
+    assert h.up("new draft") == "second"
+
+
+def test_up_preserves_current_as_draft():
+    """First up() saves current input; down past end restores it."""
+    h = InputHistory()
+    h.push("old")
+    h.up("typing in progress")
+    assert h.down() == "typing in progress"
+
+
+def test_full_cycle():
+    """Push several, navigate to oldest, then back to draft."""
+    h = InputHistory()
+    h.push("a")
+    h.push("b")
+    h.push("c")
+
+    assert h.up("draft") == "c"
+    assert h.up("draft") == "b"
+    assert h.up("draft") == "a"
+    assert h.down() == "b"
+    assert h.down() == "c"
+    assert h.down() == "draft"
+    assert h.down() is None  # already at draft