creating migration tests

android/uhabits-core/build.gradle

@@ -1,5 +1,6 @@
 apply plugin: 'idea'
 apply plugin: 'java'
+apply plugin: 'kotlin'
 
 dependencies {
     annotationProcessor "com.google.auto.factory:auto-factory:$AUTO_FACTORY_VERSION"
@@ -26,6 +27,7 @@ dependencies {
     implementation('com.opencsv:opencsv:3.10') {
         exclude group: 'commons-logging', module: 'commons-logging'
     }
+    implementation "org.jetbrains.kotlin:kotlin-stdlib:$KOTLIN_VERSION"
 }
 
 sourceCompatibility = "1.8"

android/uhabits-core/src/main/resources/migrations/23.sql

@@ -1,5 +1,5 @@
 alter table Habits add column question text;
 
-update Habits set question = description
+update Habits set question = description;
 
-update Habits set description = null
+update Habits set description = null;

android/uhabits-core/src/test/java/org/isoron/uhabits/core/database/migrations/Version23Test.kt

@@ -0,0 +1,63 @@
+package org.isoron.uhabits.core.database.migrations
+
+import org.hamcrest.MatcherAssert
+import org.hamcrest.Matchers
+import org.isoron.uhabits.core.BaseUnitTest
+import org.isoron.uhabits.core.database.Database
+import org.isoron.uhabits.core.database.MigrationHelper
+import org.isoron.uhabits.core.models.sqlite.SQLModelFactory
+import org.isoron.uhabits.core.test.HabitFixtures
+import org.junit.Test
+
+class Version23Test: BaseUnitTest() {
+
+    private lateinit var db: Database
+
+    private lateinit var helper: MigrationHelper
+
+    override fun setUp() {
+        super.setUp()
+        db = openDatabaseResource("/databases/022.db")
+        helper = MigrationHelper(db)
+        modelFactory = SQLModelFactory(db)
+        habitList = modelFactory.buildHabitList()
+        fixtures = HabitFixtures(modelFactory, habitList)
+    }
+
+    private fun migrateTo23() = helper.migrateTo(23)
+
+    @Test
+    fun `test migrate to 23 creates question column`() {
+        migrateTo23()
+        val cursor = db.query("select question from Habits")
+        cursor.moveToNext()
+    }
+
+    @Test
+    fun `test migrate to 23 moves description to question column`() {
+        var cursor = db.query("select description from Habits")
+
+        val descriptions = mutableListOf<String?>()
+        while(cursor.moveToNext()){
+            descriptions.add(cursor.getString(0))
+        }
+
+        migrateTo23()
+        cursor = db.query("select question from Habits")
+
+        for(i in 0 until descriptions.size){
+            cursor.moveToNext()
+            MatcherAssert.assertThat(cursor.getString(0), Matchers.equalTo(descriptions[i]))
+        }
+    }
+
+    @Test
+    fun `test migrate to 23 sets description to null`() {
+        migrateTo23()
+        val cursor = db.query("select description from Habits")
+
+        while(cursor.moveToNext()){
+            MatcherAssert.assertThat(cursor.getString(0), Matchers.nullValue())
+        }
+    }
+}