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// Copyright 2020 Google Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package classifier
import (
"fmt"
"testing"
)
func TestDictionary(t *testing.T) {
d := newDictionary()
if len(d.words) > 0 {
t.Errorf("new dictionary should not have words populated")
}
if len(d.indices) > 0 {
t.Errorf("new dictionary should not have indices populated")
}
// Add a word to the dictionary
d.add("hello")
// verify internal contents
if got := len(d.words); got != 1 {
t.Errorf("dictionary has %d words, expected 1", got)
}
if got := len(d.indices); got != 1 {
t.Errorf("dictionary has %d indices, expected 1", got)
}
if got := d.getIndex("hello"); got != 1 {
t.Errorf("dictionary index: got %d, want 1", got)
}
if got := d.getWord(1); got != "hello" {
t.Errorf("dictionary word: got %q, want %q", got, "hello")
}
// Adding the same word to the dictionary doesn't change the dictionary
d.add("hello")
// verify internal contents
if got := len(d.words); got != 1 {
t.Errorf("dictionary has %d words, expected 1", got)
}
if got := len(d.indices); got != 1 {
t.Errorf("dictionary has %d indices, expected 1", got)
}
if got := d.getIndex("hello"); got != 1 {
t.Errorf("dictionary index: got %d, want 1", got)
}
if got := d.getWord(1); got != "hello" {
t.Errorf("dictionary word: got %q, want %q", got, "hello")
}
// Fetching an unknown index returns the special value
if got := d.getWord(2); got != unknownWord {
t.Errorf("dictionary word: got %q, want %q", got, unknownWord)
}
// Fetching an unknown word returns the special value
if got := d.getIndex("unknown"); got != unknownIndex {
t.Errorf("dictionary word: got %d, want %d", got, unknownIndex)
}
}
func TestComputeQ(t *testing.T) {
tests := []struct {
threshold float64
expected int
}{
{
threshold: .9,
expected: 9,
},
{
threshold: .8,
expected: 4,
},
{
threshold: .67,
expected: 2,
},
{
threshold: .5,
expected: 1,
},
{
threshold: 0.0,
expected: 1,
},
{
threshold: 1.0,
expected: 10,
},
}
for i, test := range tests {
t.Run(fmt.Sprintf("threshold test %d", i), func(t *testing.T) {
if actual := computeQ(test.threshold); actual != test.expected {
t.Errorf("got %v want %v", actual, test.expected)
}
})
}
}
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