1 files changed, 65 insertions, 0 deletions
diff --git a/cmd/vartan/test.go b/cmd/vartan/test.go
new file mode 100644
index 0000000..50ba8ca
--- /dev/null
+++ b/cmd/vartan/test.go
@@ -0,0 +1,65 @@
+package main
+
+import (
+	"errors"
+	"fmt"
+	"os"
+
+	"github.com/nihei9/vartan/grammar"
+	"github.com/nihei9/vartan/tester"
+	"github.com/spf13/cobra"
+)
+
+func init() {
+	cmd := &cobra.Command{
+		Use:     "test <grammar file path> <test file path>|<test directory path>",
+		Short:   "Test a grammar",
+		Example: `  vartan test grammar.vartan test`,
+		Args:    cobra.ExactArgs(2),
+		RunE:    runTest,
+	}
+	rootCmd.AddCommand(cmd)
+}
+
+func runTest(cmd *cobra.Command, args []string) error {
+	g, err := readGrammar(args[0])
+	if err != nil {
+		return fmt.Errorf("Cannot read a grammar: %w", err)
+	}
+	cg, _, err := grammar.Compile(g)
+	if err != nil {
+		return fmt.Errorf("Cannot read a compiled grammar: %w", err)
+	}
+
+	var cs []*tester.TestCaseWithMetadata
+	{
+		cs = tester.ListTestCases(args[1])
+		errOccurred := false
+		for _, c := range cs {
+			if c.Error != nil {
+				fmt.Fprintf(os.Stderr, "Failed to read a test case or a directory: %v\n%v\n", c.FilePath, c.Error)
+				errOccurred = true
+			}
+		}
+		if errOccurred {
+			return errors.New("Cannot run test")
+		}
+	}
+
+	t := &tester.Tester{
+		Grammar: cg,
+		Cases:   cs,
+	}
+	rs := t.Run()
+	testFailed := false
+	for _, r := range rs {
+		fmt.Fprintln(os.Stdout, r)
+		if r.Error != nil {
+			testFailed = true
+		}
+	}
+	if testFailed {
+		return errors.New("Test failed")
+	}
+	return nil
+}