Implement begining of migration

Move Function/Query definition

src/test/kotlin/fr/postgresjson/MigrationTest.kt

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+package fr.postgresjson
+
+import fr.postgresjson.migration.Migrations
+import org.amshove.kluent.`should be equal to`
+import org.amshove.kluent.invoking
+import org.amshove.kluent.shouldThrow
+import org.junit.jupiter.api.Test
+import org.junit.jupiter.api.TestInstance
+import java.io.File
+
+@TestInstance(TestInstance.Lifecycle.PER_CLASS)
+class MigrationTest(): TestAbstract() {
+    @Test
+    fun upQuery() {
+        val resources = File(this::class.java.getResource("/sql/migrations").toURI())
+        val m = Migrations(resources, getConnextion())
+        m.up() `should be equal to` 1
+    }
+
+    @Test
+    fun `migration up Query should throw error if no down`() {
+        val resources = File(this::class.java.getResource("/sql/migration_without_down").toURI())
+        invoking {
+            Migrations(resources, getConnextion())
+        } shouldThrow Migrations.DownMigrationNotDefined::class
+    }
+
+    @Test
+    fun downQuery() {
+        val resources = File(this::class.java.getResource("/sql/migrations").toURI())
+        val m = Migrations(resources, getConnextion())
+        m.down() `should be equal to` 1
+    }
+
+    @Test
+    fun `test up and down migrations`() {
+        val resources = File(this::class.java.getResource("/sql/real_migrations").toURI())
+        val m = Migrations(resources, getConnextion())
+        m.test() `should be equal to` 2
+        m.test() `should be equal to` 2
+    }
+}

src/test/resources/sql/migration_without_down/1.up.sql

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+SELECT 1;

src/test/resources/sql/migrations/1.down.sql

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+SELECT 1;

src/test/resources/sql/migrations/1.up.sql

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+SELECT 1;

src/test/resources/sql/real_migrations/1.down.sql

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+DROP TABLE migration1;

src/test/resources/sql/real_migrations/1.up.sql

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+CREATE TABLE migration1 (
+    id INT
+);