reformat, add swiftformat config

.swiftformat

@@ -0,0 +1,38 @@
+# file options
+
+--exclude Tests/XCTestManifests.swift,Tests/BadConfig,Snapshots
+
+# format options
+
+--allman false
+--binarygrouping 4,8
+--commas always
+--comments indent
+--decimalgrouping 3,6
+--elseposition same-line
+--empty void
+--exponentcase lowercase
+--exponentgrouping disabled
+--fractiongrouping disabled
+--header ignore
+--hexgrouping 4,8
+--hexliteralcase uppercase
+--ifdef indent
+--indent 4
+--linebreaks lf
+--maxwidth none
+--octalgrouping 4,8
+--operatorfunc spaced
+--patternlet hoist
+--ranges spaced
+--self remove
+--semicolons inline
+--stripunusedargs always
+--swiftversion 4.2
+--trimwhitespace always
+--wraparguments preserve
+--wrapcollections preserve
+
+# rules
+
+--enable isEmpty

Tests/SwiftGraphQLCodegenTests/Generator/IntrospectionTests.swift

@@ -10,6 +10,6 @@ final class IntrospectionTests: XCTestCase {
         /* Tests */
 
         XCTAssertNotNil(schema)
-        XCTAssertTrue(schema.objects.map { $0.name }.count > 0)
+        XCTAssertTrue(!schema.objects.map { $0.name }.isEmpty)
     }
 }