Don't setup suite if no methods satisfy filter

When suite setup is long, the necessity to wait for all suite setups for testing one single method bothers a lot. Here's a little fix of that behavior.

suite/suite.go

@@ -82,15 +82,8 @@ func Run(t *testing.T, suite TestingSuite) {
 	suite.SetT(t)
 	defer failOnPanic(t)
 
-	if setupAllSuite, ok := suite.(SetupAllSuite); ok {
-		setupAllSuite.SetupSuite()
-	}
-	defer func() {
-		if tearDownAllSuite, ok := suite.(TearDownAllSuite); ok {
-			tearDownAllSuite.TearDownSuite()
-		}
-	}()
-
+	setupDone := false
+	
 	methodFinder := reflect.TypeOf(suite)
 	tests := []testing.InternalTest{}
 	for index := 0; index < methodFinder.NumMethod(); index++ {
@@ -100,34 +93,46 @@ func Run(t *testing.T, suite TestingSuite) {
 			fmt.Fprintf(os.Stderr, "testify: invalid regexp for -m: %s\n", err)
 			os.Exit(1)
 		}
-		if ok {
-			test := testing.InternalTest{
-				Name: method.Name,
-				F: func(t *testing.T) {
-					parentT := suite.T()
-					suite.SetT(t)
-					defer failOnPanic(t)
-
-					if setupTestSuite, ok := suite.(SetupTestSuite); ok {
-						setupTestSuite.SetupTest()
-					}
-					if beforeTestSuite, ok := suite.(BeforeTest); ok {
-						beforeTestSuite.BeforeTest(methodFinder.Elem().Name(), method.Name)
-					}
-					defer func() {
-						if afterTestSuite, ok := suite.(AfterTest); ok {
-							afterTestSuite.AfterTest(methodFinder.Elem().Name(), method.Name)
-						}
-						if tearDownTestSuite, ok := suite.(TearDownTestSuite); ok {
-							tearDownTestSuite.TearDownTest()
-						}
-						suite.SetT(parentT)
-					}()
-					method.Func.Call([]reflect.Value{reflect.ValueOf(suite)})
-				},
-			}
-			tests = append(tests, test)
+		if !ok {
+			continue
 		}
+		if !setupDone {
+			if setupAllSuite, ok := suite.(SetupAllSuite); ok {
+				setupAllSuite.SetupSuite()
+			}
+			defer func() {
+				if tearDownAllSuite, ok := suite.(TearDownAllSuite); ok {
+					tearDownAllSuite.TearDownSuite()
+				}
+			}()
+			setupDone = true
+		}
+		test := testing.InternalTest{
+			Name: method.Name,
+			F: func(t *testing.T) {
+				parentT := suite.T()
+				suite.SetT(t)
+				defer failOnPanic(t)
+
+				if setupTestSuite, ok := suite.(SetupTestSuite); ok {
+					setupTestSuite.SetupTest()
+				}
+				if beforeTestSuite, ok := suite.(BeforeTest); ok {
+					beforeTestSuite.BeforeTest(methodFinder.Elem().Name(), method.Name)
+				}
+				defer func() {
+					if afterTestSuite, ok := suite.(AfterTest); ok {
+						afterTestSuite.AfterTest(methodFinder.Elem().Name(), method.Name)
+					}
+					if tearDownTestSuite, ok := suite.(TearDownTestSuite); ok {
+						tearDownTestSuite.TearDownTest()
+					}
+					suite.SetT(parentT)
+				}()
+				method.Func.Call([]reflect.Value{reflect.ValueOf(suite)})
+			},
+		}
+		tests = append(tests, test)
 	}
 	runTests(t, tests)
 }