chore: add GUT test framework

addons/gut/test/unit/test_one_to_many.gd

@@ -0,0 +1,60 @@
+extends "res://addons/gut/test.gd"
+
+var OneToMany = GutUtils.OneToMany
+
+func test_can_make_one():
+	assert_not_null(OneToMany.new())
+
+func test_size():
+	var otm  = OneToMany.new()
+	assert_eq(otm.size(), 0)
+
+func test_can_add_one():
+	var otm = OneToMany.new()
+	otm.add('one', 'many1')
+	assert_eq(otm.size(), 1)
+
+func test_size_with_name():
+	var otm = OneToMany.new()
+	otm.add('one', 'many1')
+	otm.add('one', 'many2')
+	otm.add('one', 'many3')
+	otm.add('two', 'two-1')
+	assert_eq(otm.size('one'), 3, 'checking one')
+	assert_eq(otm.size('two'), 1, 'checking two')
+
+func test_size_when_name_does_not_exist_returns_0():
+	var otm = OneToMany.new()
+	assert_eq(otm.size('missing'), 0)
+
+func test_ignores_duplicate_many():
+	var otm = OneToMany.new()
+	otm.add('one', 'many1')
+	otm.add('one', 'many1')
+	otm.add('one', 'many2')
+	assert_eq(otm.size('one'), 2)
+
+func test_clear():
+	var otm = OneToMany.new()
+	otm.add('one', 'many1')
+	otm.add('two', 'many2')
+	otm.add('three', 'many3')
+	assert_eq(otm.size(), 3, 'check before clear')
+	otm.clear()
+	assert_eq(otm.size(), 0)
+
+func test_has():
+	var otm = OneToMany.new()
+	otm.add('one', 'one-1')
+	otm.add('two', 'two-1')
+	otm.add('two', 'two-2')
+	assert_true(otm.has('two', 'two-2'), 'has two/two-2')
+	assert_false(otm.has('not', 'in-there'), 'does not exist')
+
+func test_adding_an_existing_value_does_not_clear_out_all_values():
+	var otm = OneToMany.new()
+	otm.add('two', 'two-1')
+	otm.add('two', 'two-2')
+	otm.add('two', 'two-1')
+	assert_true(otm.has('two', 'two-2'), 'has two/two-2')
+	print(otm.to_s())