fix linux tests formatting (#13)

motivation: use consistent formatting

changes: update generate_linux_tests to match the formatting rules we use: `swiftformat --self insert --patternlet inline --stripunusedargs unnamed-only --comments ignore`

.swiftformat

@@ -0,0 +1,10 @@
+# file options
+
+# format options
+
+--self insert 
+--patternlet inline 
+--stripunusedargs unnamed-only 
+--comments ignore
+
+# rules

Tests/MetricsTests/CoreMetricsTests+XCTest.swift

@@ -23,7 +23,6 @@ import XCTest
 ///
 
 extension MetricsTests {
-
     static var allTests: [(String, (MetricsTests) -> () throws -> Void)] {
         return [
             ("testCounters", testCounters),
@@ -42,4 +41,3 @@ extension MetricsTests {
         ]
     }
 }
-

Tests/MetricsTests/MetricsTests+XCTest.swift

@@ -23,7 +23,6 @@ import XCTest
 ///
 
 extension MetricsExtensionsTests {
-
     static var allTests: [(String, (MetricsExtensionsTests) -> () throws -> Void)] {
         return [
             ("testTimerBlock", testTimerBlock),
@@ -32,4 +31,3 @@ extension MetricsExtensionsTests {
         ]
     }
 }
-

scripts/generate_linux_tests.rb

@@ -71,7 +71,7 @@ def createExtensionFile(fileName, classes)
     file.write "\n"
 
     for classArray in classes
-      file.write 'extension ' + classArray[0] + " {\n\n"
+      file.write 'extension ' + classArray[0] + " {\n"
       file.write '    static var allTests: [(String, (' + classArray[0] + ") -> () throws -> Void)] {\n"
       file.write "        return [\n"
 
@@ -81,7 +81,7 @@ def createExtensionFile(fileName, classes)
 
       file.write "        ]\n"
       file.write "    }\n"
-      file.write "}\n\n"
+      file.write "}\n"
     end
   end
 end