skip testsuite tests if env does not include TESTSUITE=MUST

Makefile

@@ -30,7 +30,7 @@ checklicense:
 	.txt
 
 test:
-	go test ./...
+	TESTSUITE=MUST go test ./...
 
 build:
 	go build ./...

validator/auto/suite_test.go

@@ -26,8 +26,12 @@ import (
 )
 
 func TestSuite(t *testing.T) {
-	if err := testsuite.TestSuiteExists(); err != nil {
-		t.Fatal(err)
+	exists, err := testsuite.TestSuiteExists()
+	if !exists {
+		if err != nil {
+			t.Fatal(err)
+		}
+		t.Skip()
 	}
 	tests, err := testsuite.ReadTestSuite()
 	if err != nil {

validator/intern/suite_test.go

@@ -25,8 +25,12 @@ import (
 )
 
 func TestSuite(t *testing.T) {
-	if err := testsuite.TestSuiteExists(); err != nil {
-		t.Fatal(err)
+	exists, err := testsuite.TestSuiteExists()
+	if !exists {
+		if err != nil {
+			t.Fatal(err)
+		}
+		t.Skip()
 	}
 	tests, err := testsuite.ReadTestSuite()
 	if err != nil {

validator/interp/suite_test.go

@@ -25,8 +25,12 @@ import (
 )
 
 func TestSuite(t *testing.T) {
-	if err := testsuite.TestSuiteExists(); err != nil {
-		t.Fatal(err)
+	exists, err := testsuite.TestSuiteExists()
+	if !exists {
+		if err != nil {
+			t.Fatal(err)
+		}
+		t.Skip()
 	}
 	tests, err := testsuite.ReadTestSuite()
 	if err != nil {

validator/mem/suite_test.go

@@ -25,8 +25,12 @@ import (
 )
 
 func TestSuite(t *testing.T) {
-	if err := testsuite.TestSuiteExists(); err != nil {
-		t.Fatal(err)
+	exists, err := testsuite.TestSuiteExists()
+	if !exists {
+		if err != nil {
+			t.Fatal(err)
+		}
+		t.Skip()
 	}
 	tests, err := testsuite.ReadTestSuite()
 	if err != nil {

validator/testsuite/files.go

@@ -21,9 +21,9 @@ import (
 	"path/filepath"
 	"strings"
 
-	"github.com/katydid/parser-go/parser"
 	"github.com/katydid/parser-go-json/json"
 	"github.com/katydid/parser-go-xml/xml"
+	"github.com/katydid/parser-go/parser"
 	"github.com/katydid/validator-go/validator"
 	"github.com/katydid/validator-go/validator/ast"
 )
@@ -45,11 +45,14 @@ func init() {
 	benchpath = filepath.Join(gopath, "src/github.com/katydid/testsuite/validator/benches")
 }
 
-func TestSuiteExists() error {
+func TestSuiteExists() (bool, error) {
 	if exists(testpath) {
-		return nil
+		return true, nil
+	}
+	if os.Getenv("TESTSUITE") == "MUST" {
+		return false, fmt.Errorf("testsuite does not exist at %v", testpath)
 	}
-	return fmt.Errorf("testsuite does not exist at %v", testpath)
+	return false, nil
 }
 
 func BenchSuiteExists() error {