Print test summary including failed test's result

h2spec prints out the progress of tests beautifully, but most of the
times we are interested in failed tests.  Currently, we have to look
carefully the terminal while tests are running or scroll back the
terminal to see whether failed tests exist or not.

To solve the above problem, this commit adds summary output after all
tests are performed.  It prints out the failed test cases including
expected and failed pair in a same format shown during testing.  It
also prints out the number of tests, passed, skipped and failed test
cases so that we can see what happened easily.

h2spec.go

@@ -61,36 +61,70 @@ type Test interface {
 type TestGroup struct {
 	Section      string
 	Name         string
-	testGroups []TestGroup
-	testCases  []TestCase
+	testGroups   []*TestGroup
+	testCases    []*TestCase
+	numTestCases int // the number of test cases under this group
+	numSkipped   int // the number of skipped test cases under this group
+	numFailed    int // the number of failed test cases under this group
 }
 
 func (tg *TestGroup) Run(ctx *Context, level int) {
 	runMode := ctx.GetRunMode(tg.Section)
 
 	if runMode == ModeSkip {
+		tg.numSkipped += tg.numTestCases
 		return
 	}
 
 	tg.PrintHeader(level)
 	if runMode == ModeAll {
 		for _, testCase := range tg.testCases {
-			testCase.Run(ctx, level+1)
+			switch testCase.Run(ctx, level+1) {
+			case Failed:
+				tg.numFailed += 1
+			case Skipped:
+				tg.numSkipped += 1
+			}
 		}
 		tg.PrintFooter(level)
 	}
 
 	for _, testGroup := range tg.testGroups {
 		testGroup.Run(ctx, level+1)
+		tg.numSkipped += testGroup.numSkipped
+		tg.numFailed += testGroup.numFailed
+	}
+}
+
+// PrintFailedTestCase prints failed TestCase results under this
+// TestGroup.
+func (tg *TestGroup) PrintFailedTestCase(level int) {
+	if tg.numFailed == 0 {
+		return
+	}
+
+	tg.PrintHeader(level)
+
+	for _, tc := range tg.testCases {
+		if tc.verdict {
+			continue
+		}
+		tc.PrintError(tc.expected, tc.actual, level+1)
+	}
+
+	for _, testGroup := range tg.testGroups {
+		testGroup.PrintFailedTestCase(level + 1)
 	}
 }
 
 func (tg *TestGroup) AddTestCase(testCase *TestCase) {
-	tg.testCases = append(tg.testCases, *testCase)
+	tg.testCases = append(tg.testCases, testCase)
+	tg.numTestCases += 1
 }
 
 func (tg *TestGroup) AddTestGroup(testGroup *TestGroup) {
-	tg.testGroups = append(tg.testGroups, *testGroup)
+	tg.testGroups = append(tg.testGroups, testGroup)
+	tg.numTestCases += testGroup.numTestCases
 }
 
 func (tg *TestGroup) PrintHeader(level int) {
@@ -109,21 +143,41 @@ type TestCase struct {
 	Desc     string
 	Spec     string
 	handler  func(*Context) ([]Result, Result)
+	verdict  bool     // true if test passed
+	expected []Result // expected result
+	actual   Result   // actual result
 }
 
-func (tc *TestCase) Run(ctx *Context, level int) {
+type TestResult int
+
+// TestResult indicates the result of test case
+const (
+	Failed TestResult = iota
+	Skipped
+	Passed
+)
+
+func (tc *TestCase) Run(ctx *Context, level int) TestResult {
 	expected, actual := tc.handler(ctx)
 
 	_, ok := actual.(*ResultSkipped)
 	if ok {
 		tc.PrintSkipped(actual, level)
-		return
+		return Skipped
 	}
 
+	// keep expected and actual so that we can report the failed
+	// test cases in summary.
+	tc.expected = expected
+	tc.actual = actual
+
 	if tc.evaluateResult(expected, actual) {
+		tc.verdict = true
 		tc.PrintResult(level)
+		return Passed
 	} else {
 		tc.PrintError(expected, actual, level)
+		return Failed
 	}
 }
 
@@ -181,11 +235,18 @@ func (tc *TestCase) PrintSkipped(actual Result, level int) {
 }
 
 func NewTestGroup(section, name string) *TestGroup {
-	return &TestGroup{section, name, nil, nil}
+	return &TestGroup{
+		Section: section,
+		Name:    name,
+	}
 }
 
 func NewTestCase(desc, spec string, handler func(*Context) ([]Result, Result)) *TestCase {
-	return &TestCase{desc, spec, handler}
+	return &TestCase{
+		Desc:    desc,
+		Spec:    spec,
+		handler: handler,
+	}
 }
 
 var FlagDefault http2.Flags = 0x0
@@ -551,6 +612,33 @@ func pair(name, value string) hpack.HeaderField {
 	return hpack.HeaderField{Name: name, Value: value}
 }
 
+// printSummary prints out the test summary of all tests performed.
+func printSummary(groups []*TestGroup, numTestCases, numSkipped, numFailed int) {
+	fmt.Printf("\x1b[35m")
+	fmt.Println(`
+*******************************************************************************
+*                                                                             *
+*			     Test Summary                                     *
+*                                                                             *
+*******************************************************************************`)
+	fmt.Println("\x1b[0m")
+	if numFailed > 0 {
+		fmt.Println("Failed tests:")
+		for _, tg := range groups {
+			tg.PrintFailedTestCase(1)
+		}
+	}
+
+	numPassed := numTestCases - numSkipped - numFailed
+
+	fmt.Printf("\n%v tests, %v passed, %v skipped, %v failed\n", numTestCases, numPassed, numSkipped, numFailed)
+	if numFailed == 0 {
+		fmt.Printf("\x1b[32m")
+		fmt.Printf("All tests passed\n")
+		fmt.Printf("\x1b[0m")
+	}
+}
+
 func Run(ctx *Context) {
 	groups := []*TestGroup{
 		Http2ConnectionPrefaceTestGroup(),
@@ -572,7 +660,16 @@ func Run(ctx *Context) {
 		ServerPushTestGroup(),
 	}
 
+	numTestCases := 0
+	numSkipped := 0
+	numFailed := 0
+
 	for _, group := range groups {
 		group.Run(ctx, 1)
+		numTestCases += group.numTestCases
+		numSkipped += group.numSkipped
+		numFailed += group.numFailed
 	}
+
+	printSummary(groups, numTestCases, numSkipped, numFailed)
 }