1/*
2 * Copyright (C) 2017 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#include <memory>
18
19#include "tests/functions.h"
20#include "gtest/gtest.h"
21
22namespace libtextclassifier {
23namespace nlp_core {
24namespace functions {
25
26TEST(RegistryTest, InstantiateFunctionsByName) {
27  // First, we need to register the functions we are interested in:
28  Exp::RegisterClass();
29  Inc::RegisterClass();
30  Cos::RegisterClass();
31
32  // RegisterClass methods can be called in any order, even multiple times :)
33  Cos::RegisterClass();
34  Inc::RegisterClass();
35  Inc::RegisterClass();
36  Cos::RegisterClass();
37  Inc::RegisterClass();
38
39  // NOTE: we intentionally do not register Dec.  Attempts to create an instance
40  // of that function by name should fail.
41
42  // Instantiate a few functions and check that the created functions produce
43  // the expected results for a few sample values.
44  std::unique_ptr<Function> f1(Function::Create("cos"));
45  ASSERT_NE(f1, nullptr);
46  std::unique_ptr<Function> f2(Function::Create("exp"));
47  ASSERT_NE(f2, nullptr);
48  EXPECT_NEAR(f1->Evaluate(-3), -0.9899, 0.0001);
49  EXPECT_NEAR(f2->Evaluate(2.3), 9.9741, 0.0001);
50
51  std::unique_ptr<IntFunction> f3(IntFunction::Create("inc"));
52  ASSERT_NE(f3, nullptr);
53  EXPECT_EQ(f3->Evaluate(7), 8);
54
55  // Instantiating unknown functions should return nullptr, but not crash
56  // anything.
57  EXPECT_EQ(Function::Create("mambo"), nullptr);
58
59  // Functions that are defined in the code, but are not registered are unknown.
60  EXPECT_EQ(IntFunction::Create("dec"), nullptr);
61
62  // Function and IntFunction use different registries.
63  EXPECT_EQ(IntFunction::Create("exp"), nullptr);
64}
65
66}  // namespace functions
67}  // namespace nlp_core
68}  // namespace libtextclassifier
69