✨ Add Set method to Metas and tests

models/meta_test.go

@@ -142,6 +142,66 @@ func TestMetasAppendTo(t *testing.T) {
 	assert.Equal(t, Meta{"foo", 42}, (*ms)[0])
 }
 
+func TestMetasSet(t *testing.T) {
+	tests := []struct {
+		name     string
+		initial  Metas
+		key      string
+		value    any
+		expected Metas
+	}{
+		{
+			name:     "Set new key",
+			initial:  Metas{},
+			key:      "foo",
+			value:    42,
+			expected: Metas{{"foo", 42}},
+		},
+		{
+			name:     "Update existing key",
+			initial:  Metas{{"foo", 1}},
+			key:      "foo",
+			value:    42,
+			expected: Metas{{"foo", 42}},
+		},
+		{
+			name:     "Update existing key with different type",
+			initial:  Metas{{"foo", "hello"}},
+			key:      "foo",
+			value:    42,
+			expected: Metas{{"foo", 42}},
+		},
+		{
+			name:     "Set multiple new keys",
+			initial:  Metas{},
+			key:      "bar",
+			value:    true,
+			expected: Metas{{"bar", true}},
+		},
+		{
+			name:     "Update one of multiple existing keys",
+			initial:  Metas{{"foo", 1}, {"bar", "hello"}},
+			key:      "foo",
+			value:    42,
+			expected: Metas{{"foo", 42}, {"bar", "hello"}},
+		},
+		{
+			name:     "Set new key when others exist",
+			initial:  Metas{{"foo", 1}, {"bar", "hello"}},
+			key:      "baz",
+			value:    false,
+			expected: Metas{{"foo", 1}, {"bar", "hello"}, {"baz", false}},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			result := tt.initial.Set(tt.key, tt.value)
+			assert.ElementsMatch(t, tt.expected, result)
+		})
+	}
+}
+
 func TestMetasGet(t *testing.T) {
 	ms := Metas{{"foo", 42}, {"bar", "hello"}}