Add test_list command, to enumerate unit and e2e tests.

This uses go/parser and go/ast to analyze all test files in ~1 second.
It only recognizes a few simple structures that the tests all have, and
modifies a few tests to fit expected structure better.

This is part of an effort to ensure all tests have owners, by having a
verify check to catch new tests being added without an owner.

test/e2e/density.go

@@ -450,15 +450,15 @@ var _ = framework.KubeDescribe("Density", func() {
 	}
 
 	for _, testArg := range densityTests {
-		name := fmt.Sprintf("should allow starting %d pods per node", testArg.podsPerNode)
+		feature := "ManualPerformance"
 		switch testArg.podsPerNode {
 		case 30:
-			name = "[Feature:Performance] " + name
+			feature = "Performance"
 		case 95:
-			name = "[Feature:HighDensityPerformance]" + name
+			feature = "HighDensityPerformance"
-		default:
-			name = "[Feature:ManualPerformance] " + name
 		}
+
+		name := fmt.Sprintf("[Feature:%s] should allow starting %d pods per node", feature, testArg.podsPerNode)
 		itArg := testArg
 		It(name, func() {
 			podsPerNode := itArg.podsPerNode

test/e2e/load.go

@@ -133,12 +133,11 @@ var _ = framework.KubeDescribe("Load capacity", func() {
 	}
 
 	for _, testArg := range loadTests {
-		name := fmt.Sprintf("should be able to handle %v pods per node", testArg.podsPerNode)
+		feature := "ManualPerformance"
 		if testArg.podsPerNode == 30 {
-			name = "[Feature:Performance] " + name
+			feature = "Performance"
-		} else {
-			name = "[Feature:ManualPerformance] " + name
 		}
+		name := fmt.Sprintf("[Feature:%s] should be able to handle %v pods per node", feature, testArg.podsPerNode)
 		itArg := testArg
 
 		It(name, func() {

test/e2e/networking_perf.go

@@ -43,12 +43,10 @@ var _ = framework.KubeDescribe("Networking IPerf [Experimental] [Slow] [Feature:
 
 	// A few simple bandwidth tests which are capped by nodes.
 	// TODO replace the 1 with the scale option implementation
-	runClientServerBandwidthMeasurement(f, 1, gceBandwidthBitsEstimate)
-})
-
-func runClientServerBandwidthMeasurement(f *framework.Framework, numClient int, maxBandwidthBits int64) {
 	// TODO: Make this a function parameter, once we distribute iperf endpoints, possibly via session affinity.
+	numClient := 1
 	numServer := 1
+	maxBandwidthBits := gceBandwidthBitsEstimate
 
 	It(fmt.Sprintf("should transfer ~ 1GB onto the service endpoint %v servers (maximum of %v clients)", numServer, numClient), func() {
 		nodes := framework.GetReadySchedulableNodesOrDie(f.Client)
@@ -153,4 +151,4 @@ func runClientServerBandwidthMeasurement(f *framework.Framework, numClient int,
 			framework.Logf("%v had bandwidth %v.  Ratio to expected (%v) was %f", ipClient, bandwidth, expectedBandwidth, float64(bandwidth)/float64(expectedBandwidth))
 		}
 	})
-}
+})

test/e2e/proxy.go

@@ -37,11 +37,6 @@ import (
 	. "github.com/onsi/gomega"
 )
 
-var _ = framework.KubeDescribe("Proxy", func() {
-	version := registered.GroupOrDie(api.GroupName).GroupVersion.Version
-	Context("version "+version, func() { proxyContext(version) })
-})
-
 const (
 	// Try all the proxy tests this many times (to catch even rare flakes).
 	proxyAttempts = 20
@@ -53,7 +48,9 @@ const (
 	proxyHTTPCallTimeout = 30 * time.Second
 )
 
-func proxyContext(version string) {
+var _ = framework.KubeDescribe("Proxy", func() {
+	version := registered.GroupOrDie(api.GroupName).GroupVersion.Version
+	Context("version "+version, func() {
 		options := framework.FrameworkOptions{
 			ClientQPS: -1.0,
 		}
@@ -273,7 +270,8 @@ func proxyContext(version string) {
 				Fail(strings.Join(errs, "\n"))
 			}
 		})
-}
+	})
+})
 
 func doProxy(f *framework.Framework, path string, i int) (body []byte, statusCode int, d time.Duration, err error) {
 	// About all of the proxy accesses in this file:

test/list/main.go

@@ -0,0 +1,275 @@
+/*
+Copyright 2016 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+// list all unit and ginkgo test names that will be run
+package main
+
+import (
+	"encoding/json"
+	"flag"
+	"fmt"
+	"go/ast"
+	"go/parser"
+	"go/token"
+	"log"
+	"os"
+	"path/filepath"
+	"strconv"
+	"strings"
+)
+
+var (
+	dumpTree = flag.Bool("dump", false, "print AST")
+	dumpJson = flag.Bool("json", false, "output test list as JSON")
+	warn     = flag.Bool("warn", false, "print warnings")
+)
+
+type Test struct {
+	Loc      string
+	Name     string
+	TestName string
+}
+
+// collect extracts test metadata from a file.
+// If src is nil, it reads filename for the code, otherwise it
+// uses src (which may be a string, byte[], or io.Reader).
+func collect(filename string, src interface{}) []Test {
+	// Create the AST by parsing src.
+	fset := token.NewFileSet() // positions are relative to fset
+	f, err := parser.ParseFile(fset, filename, src, parser.ParseComments)
+	if err != nil {
+		panic(err)
+	}
+
+	if *dumpTree {
+		ast.Print(fset, f)
+	}
+
+	tests := make([]Test, 0)
+
+	ast.Walk(makeWalker("[k8s.io]", fset, &tests), f)
+
+	// Unit tests are much simpler to enumerate!
+	if strings.HasSuffix(filename, "_test.go") {
+		packageName := f.Name.Name
+		dirName, _ := filepath.Split(filename)
+		if filepath.Base(dirName) != packageName && *warn {
+			log.Printf("Warning: strange path/package mismatch %s %s\n", filename, packageName)
+		}
+		testPath := "k8s.io/kubernetes/" + dirName[:len(dirName)-1]
+		for _, decl := range f.Decls {
+			funcdecl, ok := decl.(*ast.FuncDecl)
+			if !ok {
+				continue
+			}
+			name := funcdecl.Name.Name
+			if strings.HasPrefix(name, "Test") {
+				tests = append(tests, Test{fset.Position(funcdecl.Pos()).String(), testPath, name})
+			}
+		}
+	}
+
+	return tests
+}
+
+// funcName converts a selectorExpr with two idents into a string,
+// x.y -> "x.y"
+func funcName(n ast.Expr) string {
+	if sel, ok := n.(*ast.SelectorExpr); ok {
+		if x, ok := sel.X.(*ast.Ident); ok {
+			return x.String() + "." + sel.Sel.String()
+		}
+	}
+	return ""
+}
+
+// isSprintf returns whether the given node is a call to fmt.Sprintf
+func isSprintf(n ast.Expr) bool {
+	call, ok := n.(*ast.CallExpr)
+	return ok && funcName(call.Fun) == "fmt.Sprintf" && len(call.Args) != 0
+}
+
+type walker struct {
+	path  string
+	fset  *token.FileSet
+	tests *[]Test
+	vals  map[string]string
+}
+
+func makeWalker(path string, fset *token.FileSet, tests *[]Test) *walker {
+	return &walker{path, fset, tests, make(map[string]string)}
+}
+
+// clone creates a new walker with the given string extending the path.
+func (w *walker) clone(ext string) *walker {
+	return &walker{w.path + " " + ext, w.fset, w.tests, w.vals}
+}
+
+// firstArg attempts to statically determine the value of the first
+// argument. It only handles strings, and converts any unknown values
+// (fmt.Sprintf interpolations) into *.
+func (w *walker) firstArg(n *ast.CallExpr) string {
+	if len(n.Args) == 0 {
+		return ""
+	}
+	var lit *ast.BasicLit
+	if isSprintf(n.Args[0]) {
+		return w.firstArg(n.Args[0].(*ast.CallExpr))
+	}
+	lit, ok := n.Args[0].(*ast.BasicLit)
+	if ok && lit.Kind == token.STRING {
+		v, err := strconv.Unquote(lit.Value)
+		if err != nil {
+			panic(err)
+		}
+		if strings.Contains(v, "%") {
+			v = strings.Replace(v, "%d", "*", -1)
+			v = strings.Replace(v, "%v", "*", -1)
+			v = strings.Replace(v, "%s", "*", -1)
+		}
+		return v
+	}
+	if ident, ok := n.Args[0].(*ast.Ident); ok {
+		if val, ok := w.vals[ident.String()]; ok {
+			return val
+		}
+	}
+	if *warn {
+		log.Printf("Warning: dynamic arg value: %v\n", w.fset.Position(n.Args[0].Pos()))
+	}
+	return "*"
+}
+
+// describeName returns the first argument of a function if it's
+// a Ginkgo-relevant function (Describe/KubeDescribe/Context),
+// and the empty string otherwise.
+func (w *walker) describeName(n *ast.CallExpr) string {
+	switch x := n.Fun.(type) {
+	case *ast.SelectorExpr:
+		if x.Sel.Name != "KubeDescribe" {
+			return ""
+		}
+	case *ast.Ident:
+		if x.Name != "Describe" && x.Name != "Context" {
+			return ""
+		}
+	default:
+		return ""
+	}
+	return w.firstArg(n)
+}
+
+// itName returns the first argument if it's a call to It(), else "".
+func (w *walker) itName(n *ast.CallExpr) string {
+	if fun, ok := n.Fun.(*ast.Ident); ok && fun.Name == "It" {
+		return w.firstArg(n)
+	}
+	return ""
+}
+
+// Visit walks the AST, following Ginkgo context and collecting tests.
+// See the documentation for ast.Walk for more details.
+func (w *walker) Visit(n ast.Node) ast.Visitor {
+	switch x := n.(type) {
+	case *ast.CallExpr:
+		name := w.describeName(x)
+		if name != "" && len(x.Args) >= 2 {
+			// If calling (Kube)Describe/Context, make a new
+			// walker to recurse with the description added.
+			return w.clone(name)
+		}
+		name = w.itName(x)
+		if name != "" {
+			// We've found an It() call, the full test name
+			// can be determined now.
+			if w.path == "[k8s.io]" && *warn {
+				log.Printf("It without matching Describe: %s\n", w.fset.Position(n.Pos()))
+			}
+			*w.tests = append(*w.tests, Test{w.fset.Position(n.Pos()).String(), w.path, name})
+			return nil // Stop walking
+		}
+	case *ast.AssignStmt:
+		// Attempt to track literals that might be used as
+		// arguments. This analysis is very unsound, and ignores
+		// both scope and program flow, but is sufficient for
+		// our minor use case.
+		ident, ok := x.Lhs[0].(*ast.Ident)
+		if ok {
+			if isSprintf(x.Rhs[0]) {
+				// x := fmt.Sprintf("something", args)
+				w.vals[ident.String()] = w.firstArg(x.Rhs[0].(*ast.CallExpr))
+			}
+			if lit, ok := x.Rhs[0].(*ast.BasicLit); ok && lit.Kind == token.STRING {
+				// x := "a literal string"
+				v, err := strconv.Unquote(lit.Value)
+				if err != nil {
+					panic(err)
+				}
+				w.vals[ident.String()] = v
+			}
+		}
+	}
+	return w // Continue walking
+}
+
+type testList struct {
+	tests []Test
+}
+
+// handlePath walks the filesystem recursively, collecting tests
+// from files with paths *e2e*.go and *_test.go, ignoring third_party
+// and staging directories.
+func (t *testList) handlePath(path string, info os.FileInfo, err error) error {
+	if err != nil {
+		return err
+	}
+	if strings.Contains(path, "third_party") ||
+		strings.Contains(path, "staging") {
+		return filepath.SkipDir
+	}
+	if strings.HasSuffix(path, ".go") && strings.Contains(path, "e2e") ||
+		strings.HasSuffix(path, "_test.go") {
+		tests := collect(path, nil)
+		t.tests = append(t.tests, tests...)
+	}
+	return nil
+}
+
+func main() {
+	flag.Parse()
+	args := flag.Args()
+	if len(args) == 0 {
+		args = append(args, ".")
+	}
+	tests := testList{}
+	for _, arg := range args {
+		err := filepath.Walk(arg, tests.handlePath)
+		if err != nil {
+			log.Fatalf("Error walking: %v", err)
+		}
+	}
+	if *dumpJson {
+		json, err := json.Marshal(tests.tests)
+		if err != nil {
+			log.Fatal(err)
+		}
+		fmt.Println(string(json))
+	} else {
+		for _, t := range tests.tests {
+			fmt.Println(t)
+		}
+	}
+}

test/list/main_test.go

@@ -0,0 +1,111 @@
+/*
+Copyright 2016 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package main
+
+import (
+	"errors"
+	"path/filepath"
+	"reflect"
+	"testing"
+)
+
+var collectCases = []struct {
+	filename string
+	code     string
+	output   []Test
+}{
+	// Empty: no tests
+	{"e2e/util_test.go", "", []Test{}},
+	// Go unit test
+	{"test/list/main_test.go", `
+var num = 3
+func Helper(x int) { return x / 0 }
+func TestStuff(t *Testing.T) {
+}`, []Test{{"test/list/main_test.go:5:1", "k8s.io/kubernetes/test/list", "TestStuff"}},
+	},
+	// Describe + It
+	{"e2e/foo.go", `
+var _ = Describe("Feature", func() {
+	It("should work properly", func() {})
+})`, []Test{{"e2e/foo.go:4:2", "[k8s.io] Feature", "should work properly"}},
+	},
+	// KubeDescribe + It
+	{"e2e/foo.go", `
+var _ = framework.KubeDescribe("Feature", func() {
+	It("should work properly", func() {})
+})`, []Test{{"e2e/foo.go:4:2", "[k8s.io] Feature", "should work properly"}},
+	},
+	// KubeDescribe + Context + It
+	{"e2e/foo.go", `
+var _ = framework.KubeDescribe("Feature", func() {
+	Context("when offline", func() {
+		It("should work", func() {})
+	})
+})`, []Test{{"e2e/foo.go:5:3", "[k8s.io] Feature when offline", "should work"}},
+	},
+	// KubeDescribe + It(Sprintf)
+	{"e2e/foo.go", `
+var _ = framework.KubeDescribe("Feature", func() {
+	It(fmt.Sprintf("handles %d nodes", num), func() {})
+})`, []Test{{"e2e/foo.go:4:2", "[k8s.io] Feature", "handles * nodes"}},
+	},
+	// KubeDescribe + Sprintf + It(var)
+	{"e2e/foo.go", `
+var _ = framework.KubeDescribe("Feature", func() {
+	arg := fmt.Sprintf("does %s and %v at %d", task, desc, num)
+	It(arg, func() {})
+})`, []Test{{"e2e/foo.go:5:2", "[k8s.io] Feature", "does * and * at *"}},
+	},
+	// KubeDescribe + string + It(var)
+	{"e2e/foo.go", `
+var _ = framework.KubeDescribe("Feature", func() {
+	arg := "does stuff"
+	It(arg, func() {})
+})`, []Test{{"e2e/foo.go:5:2", "[k8s.io] Feature", "does stuff"}},
+	},
+	// KubeDescribe + It(unknown)
+	{"e2e/foo.go", `
+var _ = framework.KubeDescribe("Feature", func() {
+	It(mysteryFunc(), func() {})
+})`, []Test{{"e2e/foo.go:4:2", "[k8s.io] Feature", "*"}},
+	},
+}
+
+func TestCollect(t *testing.T) {
+	for _, test := range collectCases {
+		code := "package test\n" + test.code
+		tests := collect(test.filename, code)
+		if !reflect.DeepEqual(tests, test.output) {
+			t.Errorf("code:\n%s\ngot  %v\nwant %v",
+				code, tests, test.output)
+		}
+	}
+}
+
+func TestHandlePath(t *testing.T) {
+	tl := testList{}
+	e := errors.New("ex")
+	if tl.handlePath("foo", nil, e) != e {
+		t.Error("handlePath not returning errors")
+	}
+	if tl.handlePath("foo.txt", nil, nil) != nil {
+		t.Error("should skip random files")
+	}
+	if tl.handlePath("third_party/a_test.go", nil, nil) != filepath.SkipDir {
+		t.Error("should skip third_party")
+	}
+}