Use Go 1.7 subtests so suites can properly nest

This removes dependencies on Go Testing Internals and
also enables test methods within a suite to have subtests.

Fixes #346

suite/suite.go

@@ -12,6 +12,7 @@ import (
 	"github.com/stretchr/testify/require"
 )
 
+var allTestsFilter = func(_, _ string) (bool, error) { return true, nil }
 var matchMethod = flag.String("testify.m", "", "regular expression to select tests of the testify suite to run")
 
 // Suite is a basic testing suite with methods for storing and
@@ -104,10 +105,20 @@ func Run(t *testing.T, suite TestingSuite) {
 			tests = append(tests, test)
 		}
 	}
+	runTests(t, tests)
+}
 
-	if !testing.RunTests(func(_, _ string) (bool, error) { return true, nil },
-		tests) {
-		t.Fail()
+func runTests(t testing.TB, tests []testing.InternalTest) {
+	r, ok := t.(runner)
+	if !ok { // backwards compatibility with Go 1.6 and below
+		if !testing.RunTests(allTestsFilter, tests) {
+			t.Fail()
+		}
+		return
+	}
+
+	for _, test := range tests {
+		r.Run(test.Name, test.F)
 	}
 }
 
@@ -119,3 +130,7 @@ func methodFilter(name string) (bool, error) {
 	}
 	return regexp.MatchString(*matchMethod, name)
 }
+
+type runner interface {
+	Run(name string, f func(t *testing.T)) bool
+}

suite/suite_test.go

@@ -8,6 +8,7 @@ import (
 	"time"
 
 	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
 )
 
 // SuiteRequireTwice is intended to test the usage of suite.Require in two
@@ -19,7 +20,7 @@ type SuiteRequireTwice struct{ Suite }
 // A regression would result on these tests panicking rather than failing.
 func TestSuiteRequireTwice(t *testing.T) {
 	ok := testing.RunTests(
-		func(_, _ string) (bool, error) { return true, nil },
+		allTestsFilter,
 		[]testing.InternalTest{{
 			Name: "TestSuiteRequireTwice",
 			F: func(t *testing.T) {
@@ -267,16 +268,19 @@ func (sc *StdoutCapture) StopCapture() (string, error) {
 }
 
 func TestSuiteLogging(t *testing.T) {
-	testT := testing.T{}
-
 	suiteLoggingTester := new(SuiteLoggingTester)
-
 	capture := StdoutCapture{}
+	internalTest := testing.InternalTest{
+		Name: "SomeTest",
+		F: func(subT *testing.T) {
+			Run(subT, suiteLoggingTester)
+		},
+	}
 	capture.StartCapture()
-	Run(&testT, suiteLoggingTester)
+	testing.RunTests(allTestsFilter, []testing.InternalTest{internalTest})
 	output, err := capture.StopCapture()
-
-	assert.Nil(t, err, "Got an error trying to capture stdout!")
+	require.NoError(t, err, "Got an error trying to capture stdout and stderr!")
+	require.NotEmpty(t, output, "output content must not be empty")
 
 	// Failed tests' output is always printed
 	assert.Contains(t, output, "TESTLOGFAIL")