PreferenceGroupTest.kt revision c70fa8cd4041a803ee3be1a10ea530f8c6e6ff22 
1/*
2 * Copyright 2018 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
17package androidx.preference
18
19import android.support.test.InstrumentationRegistry
20import android.support.test.rule.ActivityTestRule
21import androidx.testutils.assertThrows
22import androidx.testutils.fail
23import com.google.common.truth.Truth.assertThat
24import org.junit.Assert.assertEquals
25import org.junit.Assert.assertFalse
26import org.junit.Assert.assertSame
27import org.junit.Assert.assertTrue
28import org.junit.Before
29import org.junit.Rule
30import org.junit.Test
31
32class PreferenceGroupTest {
33
34    @JvmField
35    @Rule
36    val rule = ActivityTestRule(TestPreferenceActivity::class.java)
37    private val context = InstrumentationRegistry.getContext()
38    private lateinit var preferenceGroup: PreferenceGroup
39
40    @Before fun setup() {
41        preferenceGroup = (rule
42                .activity
43                .fragmentManager
44                .findFragmentByTag(TestPreferenceActivity.TAG) as PreferenceFragment).preferenceScreen
45    }
46
47    @Test fun get() {
48        val key = "key"
49        val preference = Preference(context)
50        preference.key = key
51        preferenceGroup.addPreference(preference)
52        assertSame(preference, preferenceGroup[key])
53        assertSame(preference, preferenceGroup[0])
54    }
55
56    @Test fun contains() {
57        val preference = Preference(context)
58        assertFalse(preference in preferenceGroup)
59        assertTrue(preference !in preferenceGroup)
60        preferenceGroup.addPreference(preference)
61        assertFalse(preference !in preferenceGroup)
62        assertTrue(preference in preferenceGroup)
63        preferenceGroup.removePreference(preference)
64        assertFalse(preference in preferenceGroup)
65        assertTrue(preference !in preferenceGroup)
66    }
67
68    @Test fun plusAssign() {
69        assertEquals(0, preferenceGroup.preferenceCount)
70
71        val preference1 = Preference(context)
72        preferenceGroup += preference1
73        assertEquals(1, preferenceGroup.preferenceCount)
74        assertSame(preference1, preferenceGroup.getPreference(0))
75
76        val preference2 = Preference(context)
77        preferenceGroup += preference2
78        assertEquals(2, preferenceGroup.preferenceCount)
79        assertSame(preference2, preferenceGroup.getPreference(1))
80    }
81
82    @Test fun minusAssign() {
83        val preference1 = Preference(context)
84        preferenceGroup.addPreference(preference1)
85        val preference2 = Preference(context)
86        preferenceGroup.addPreference(preference2)
87
88        assertEquals(2, preferenceGroup.preferenceCount)
89
90        preferenceGroup -= preference2
91        assertEquals(1, preferenceGroup.preferenceCount)
92        assertSame(preference1, preferenceGroup.getPreference(0))
93
94        preferenceGroup -= preference1
95        assertEquals(0, preferenceGroup.preferenceCount)
96    }
97
98    @Test fun size() {
99        assertEquals(0, preferenceGroup.size)
100
101        val preference = Preference(context)
102        preferenceGroup.addPreference(preference)
103        assertEquals(1, preferenceGroup.size)
104
105        preferenceGroup.removePreference(preference)
106        assertEquals(0, preferenceGroup.size)
107    }
108
109    @Test fun isEmpty() {
110        assertTrue(preferenceGroup.isEmpty())
111        preferenceGroup.addPreference(Preference(context))
112        assertFalse(preferenceGroup.isEmpty())
113    }
114
115    @Test fun isNotEmpty() {
116        assertFalse(preferenceGroup.isNotEmpty())
117        preferenceGroup.addPreference(Preference(context))
118        assertTrue(preferenceGroup.isNotEmpty())
119    }
120
121    @Test fun forEach() {
122        preferenceGroup.forEach {
123            fail("Empty preference group should not invoke lambda")
124        }
125
126        val preference1 = Preference(context).apply { key = "ASD" }
127        preferenceGroup.addPreference(preference1)
128        val preference2 = Preference(context)
129        preferenceGroup.addPreference(preference2)
130
131        val preferences = mutableListOf<Preference>()
132        preferenceGroup.forEach {
133            preferences += it
134        }
135        assertThat(preferences).containsExactly(preference1, preference2)
136    }
137
138    @Test fun forEachIndexed() {
139        preferenceGroup.forEach {
140            fail("Empty preference group should not invoke lambda")
141        }
142
143        val preference1 = Preference(context)
144        preferenceGroup.addPreference(preference1)
145        val preference2 = Preference(context)
146        preferenceGroup.addPreference(preference2)
147
148        val preferences = mutableListOf<Preference>()
149        preferenceGroup.forEachIndexed { index, preference ->
150            assertEquals(index, preferences.size)
151            preferences += preference
152        }
153        assertThat(preferences).containsExactly(preference1, preference2)
154    }
155
156    @Test fun iterator() {
157        val preference1 = Preference(context)
158        preferenceGroup.addPreference(preference1)
159        val preference2 = Preference(context)
160        preferenceGroup.addPreference(preference2)
161
162        val iterator = preferenceGroup.iterator()
163        assertTrue(iterator.hasNext())
164        assertSame(preference1, iterator.next())
165        assertTrue(iterator.hasNext())
166        assertSame(preference2, iterator.next())
167        assertFalse(iterator.hasNext())
168        assertThrows<IndexOutOfBoundsException> {
169            iterator.next()
170        }
171    }
172
173    @Test fun children() {
174        val preferences = listOf(Preference(context), Preference(context), Preference(context))
175        preferences.forEach { preferenceGroup.addPreference(it) }
176
177        preferenceGroup.children.forEachIndexed { index, child ->
178            assertSame(preferences[index], child)
179        }
180    }
181}
182