Fixes #1896: Thoroughly test ItemSelectionInputContainsAtLeastOneOfRuleClassifier

domain/src/main/java/org/oppia/android/domain/classify/rules/itemselectioninput/ItemSelectionInputContainsAtLeastOneOfRuleClassifierProvider.kt

@@ -25,7 +25,6 @@ internal class ItemSelectionInputContainsAtLeastOneOfRuleClassifierProvider @Inj
     )
   }
 
-  // TODO(#210): Add tests for this classifier.
   override fun matches(answer: StringList, input: StringList): Boolean {
     return answer.htmlList.toSet().intersect(input.htmlList).isNotEmpty()
   }

domain/src/test/java/org/oppia/android/domain/classify/rules/itemselectioninput/ItemSelectionInputContainsAtLeastOneOfRuleClassifierProviderTest.kt

@@ -0,0 +1,124 @@
+package org.oppia.android.domain.classify.rules.itemselectioninput
+
+import android.app.Application
+import androidx.test.core.app.ApplicationProvider
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import com.google.common.truth.Truth.assertThat
+import dagger.BindsInstance
+import dagger.Component
+import org.junit.Before
+import org.junit.Test
+import org.junit.runner.RunWith
+import org.oppia.android.app.model.InteractionObject
+import org.oppia.android.app.model.StringList
+import org.robolectric.annotation.Config
+import org.robolectric.annotation.LooperMode
+import javax.inject.Inject
+import javax.inject.Singleton
+
+/** Tests for [ItemSelectionInputContainsAtLeastOneOfRuleClassifierProvider]. */
+@RunWith(AndroidJUnit4::class)
+@LooperMode(LooperMode.Mode.PAUSED)
+@Config(manifest = Config.NONE)
+
+class ItemSelectionInputContainsAtLeastOneOfRuleClassifierProviderTest {
+  private val ITEM_SELECTION_SET_5 = createStringList(
+    StringList.newBuilder()
+      .addHtml("test1")
+      .addHtml("test2")
+      .addHtml("test3")
+      .addHtml("test4")
+      .addHtml("test5")
+      .build()
+  )
+
+  private val ITEM_SELECTION_SET_SUBSET = createStringList(
+    StringList.newBuilder().addHtml("test1")
+      .build()
+  )
+
+  private val ITEM_SELECTION_SET_ONE_ELEMENT_PRESENT = createStringList(
+    StringList.newBuilder().addHtml("test1").addHtml("test6")
+      .build()
+  )
+
+  private val ITEM_SELECTION_SET_EXCLUSIVE = createStringList(
+    StringList.newBuilder().addHtml("test6")
+      .build()
+  )
+
+  @Inject
+  internal lateinit var itemSelectionInputContainsAtLeastOneOfRuleClassifierProvider:
+    ItemSelectionInputContainsAtLeastOneOfRuleClassifierProvider
+
+  private val inputContainsAtLeastOneOfRuleClassifier by lazy {
+    itemSelectionInputContainsAtLeastOneOfRuleClassifierProvider.createRuleClassifier()
+  }
+
+  @Before
+  fun setUp() {
+    setUpTestApplicationComponent()
+  }
+
+  @Test
+  fun testItemSet_setAnswer_inputIsASubset_answerContainsInput() {
+    val inputs = mapOf("x" to ITEM_SELECTION_SET_SUBSET)
+
+    val matches = inputContainsAtLeastOneOfRuleClassifier.matches(
+      answer = ITEM_SELECTION_SET_5,
+      inputs = inputs
+    )
+
+    assertThat(matches).isTrue()
+  }
+
+  @Test
+  fun testItemSet_setAnswer_inputHasOneElementInSet_answerContainsInput() {
+    val inputs = mapOf("x" to ITEM_SELECTION_SET_ONE_ELEMENT_PRESENT)
+
+    val matches = inputContainsAtLeastOneOfRuleClassifier.matches(
+      answer = ITEM_SELECTION_SET_5,
+      inputs = inputs
+    )
+
+    assertThat(matches).isTrue()
+  }
+
+  @Test
+  fun testItemSet_setAnswer_inputIsExclusiveOfSet_answerDoesNotContainInput() {
+    val inputs = mapOf("x" to ITEM_SELECTION_SET_EXCLUSIVE)
+
+    val matches = inputContainsAtLeastOneOfRuleClassifier.matches(
+      answer = ITEM_SELECTION_SET_5,
+      inputs = inputs
+    )
+
+    assertThat(matches).isFalse()
+  }
+
+  private fun createStringList(value: StringList): InteractionObject {
+    return InteractionObject.newBuilder().setSetOfHtmlString(value).build()
+  }
+
+  private fun setUpTestApplicationComponent() {
+    DaggerItemSelectionInputContainsAtLeastOneOfRuleClassifierProviderTest_TestApplicationComponent
+      .builder()
+      .setApplication(ApplicationProvider.getApplicationContext())
+      .build()
+      .inject(this)
+  }
+
+  @Singleton
+  @Component(modules = [])
+  interface TestApplicationComponent {
+    @Component.Builder
+    interface Builder {
+      @BindsInstance
+      fun setApplication(application: Application): Builder
+
+      fun build(): TestApplicationComponent
+    }
+
+    fun inject(test: ItemSelectionInputContainsAtLeastOneOfRuleClassifierProviderTest)
+  }
+}