test: write a case for TryParse (#45)

detector/parsers/parsers_test.go

@@ -0,0 +1,64 @@
+package parsers_test
+
+import (
+	"errors"
+	"io/ioutil"
+	"osv-detector/detector/parsers"
+	"strings"
+	"testing"
+)
+
+func expectNumberOfParsersCalled(t *testing.T, numberOfParsersCalled int) {
+	t.Helper()
+
+	directories, err := ioutil.ReadDir(".")
+
+	if err != nil {
+		t.Fatalf("unable to read current directory: ")
+	}
+
+	count := 0
+
+	for _, directory := range directories {
+		if strings.HasPrefix(directory.Name(), "parse-") &&
+			!strings.HasSuffix(directory.Name(), "_test.go") {
+			count++
+		}
+	}
+
+	if numberOfParsersCalled != count {
+		t.Errorf(
+			"Expected %d parsers to have been called, but had %d",
+			count,
+			numberOfParsersCalled,
+		)
+	}
+}
+
+func TestTryParse_FindsExpectedParsers(t *testing.T) {
+	t.Parallel()
+
+	lockfiles := []string{
+		"cargo.lock",
+		"package-lock.json",
+		"yarn.lock",
+		"pnpm-lock.yaml",
+		"composer.lock",
+		"Gemfile.lock",
+		"requirements.txt",
+	}
+
+	count := 0
+
+	for _, lockfile := range lockfiles {
+		_, err := parsers.TryParse("/path/to/my/"+lockfile, "")
+
+		if errors.Is(err, parsers.ErrParserNotFound) {
+			t.Errorf("No parser was found for %s", lockfile)
+		}
+
+		count++
+	}
+
+	expectNumberOfParsersCalled(t, count)
+}