migrate json schema generation (#4270)

Signed-off-by: Alex Goodman <wagoodman@users.noreply.github.com>

internal/sourcemetadata/names_test.go

@@ -0,0 +1,30 @@
+package sourcemetadata
+
+import (
+	"reflect"
+	"testing"
+
+	"github.com/google/go-cmp/cmp"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestAllNames(t *testing.T) {
+	// note: this is a form of completion testing relative to the current code base.
+
+	expected, err := DiscoverTypeNames()
+	require.NoError(t, err)
+
+	actual := AllTypeNames()
+
+	// ensure that the codebase (from ast analysis) reflects the latest code generated state
+	if !assert.ElementsMatch(t, expected, actual) {
+		t.Errorf("metadata types not fully represented: \n%s", cmp.Diff(expected, actual))
+		t.Log("did you add a new source.*Metadata type without updating the JSON schema?")
+		t.Log("if so, you need to update the schema version and regenerate the JSON schema (make generate-json-schema)")
+	}
+
+	for _, ty := range AllTypes() {
+		assert.NotEmpty(t, JSONName(ty), "metadata type %q does not have a JSON name", reflect.TypeOf(ty).Name())
+	}
+}