Merge pull request opencontainers#2 from wking/auto-plan-header

tap: Teach Header to skip the plan when testCount < 1

Author: Michael Hendricks

util/tap/Makefile

@@ -1,5 +1,9 @@
-.PHONY: test
+TESTS = known auto
 
-test:
-	go build main/test.go
-	prove -v -e '' ./test
+.PHONY: $(TESTS)
+
+all: $(TESTS)
+
+$(TESTS): %: test/%/main.go
+	go build -o $@ test/$@/main.go
+	prove -v -e '' ./$@

util/tap/tap.go

@@ -15,10 +15,14 @@ func New() *T {
 }
 
 // Header displays a TAP header including version number and expected
-// number of tests to run.
+// number of tests to run.  For an unknown number of tests, set
+// testCount to zero (in which case the plan is not written); this is
+// useful with AutoPlan.
 func (t *T) Header(testCount int) {
 	fmt.Printf("TAP version 13\n")
-	fmt.Printf("1..%d\n", testCount)
+	if testCount > 0 {
+		fmt.Printf("1..%d\n", testCount)
+	}
 }
 
 // Ok generates TAP output indicating whether a test passed or failed.

util/tap/test/auto/main.go

@@ -0,0 +1,11 @@
+package main
+
+import "github.com/mndrix/tap.go"
+
+func main() {
+	t := tap.New()
+	t.Header(0)
+	t.Ok(true, "first test")
+	t.Ok(true, "second test")
+	t.AutoPlan()
+}

util/tap/test/known/main.go

@@ -0,0 +1,10 @@
+package main
+
+import "github.com/mndrix/tap.go"
+
+func main() {
+	t := tap.New()
+	t.Header(2)
+	t.Ok(true, "first test")
+	t.Ok(true, "second test")
+}