[5.7] Support "geometry" type in Postgres schema grammar (#25323)

* [5.7] Support "geometry" type in Postgres schema grammar

* Fix issues that StyleCI identified

Author: Jesse Denardo

src/Illuminate/Database/Schema/Grammars/PostgresGrammar.php

@@ -2,7 +2,6 @@
 
 namespace Illuminate\Database\Schema\Grammars;
 
-use RuntimeException;
 use Illuminate\Support\Fluent;
 use Illuminate\Database\Schema\Blueprint;
 
@@ -725,11 +724,11 @@ protected function typeMacAddress(Fluent $column)
      * Create the column definition for a spatial Geometry type.
      *
      * @param  \Illuminate\Support\Fluent  $column
-     * @throws \RuntimeException
+     * @return string
      */
     protected function typeGeometry(Fluent $column)
     {
-        throw new RuntimeException('The database driver in use does not support the Geometry spatial column type.');
+        return $this->formatPostGisType('geometry');
     }
 
     /**

tests/Database/DatabasePostgresSchemaGrammarTest.php

@@ -702,15 +702,14 @@ public function testCompileForeign()
         $this->assertEquals('alter table "users" add constraint "users_parent_id_foreign" foreign key ("parent_id") references "parents" ("id") on delete cascade deferrable initially deferred', $statements[0]);
     }
 
-    /**
-     * @expectedException \RuntimeException
-     * @expectedExceptionMessage The database driver in use does not support the Geometry spatial column type.
-     */
     public function testAddingGeometry()
     {
         $blueprint = new Blueprint('geo');
         $blueprint->geometry('coordinates');
-        $blueprint->toSql($this->getConnection(), $this->getGrammar());
+        $statements = $blueprint->toSql($this->getConnection(), $this->getGrammar());
+
+        $this->assertCount(1, $statements);
+        $this->assertEquals('alter table "geo" add column "coordinates" geography(geometry, 4326) not null', $statements[0]);
     }
 
     public function testAddingPoint()