From 4d0139084596a18a2ba0af583bd2cc3bad164aab Mon Sep 17 00:00:00 2001
From: Nathan Shively-Sanders <293473+sandersn@users.noreply.github.com>
Date: Fri, 10 Nov 2017 15:55:29 -0800
Subject: [PATCH] Improve assert message

---
 src/harness/externalCompileRunner.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/harness/externalCompileRunner.ts b/src/harness/externalCompileRunner.ts
index 75ccecb047d..2a44badd813 100644
--- a/src/harness/externalCompileRunner.ts
+++ b/src/harness/externalCompileRunner.ts
@@ -46,7 +46,7 @@ abstract class ExternalCompileRunnerBase extends RunnerBase {
                     if (update.status !== 0) throw new Error(`git submodule update for ${directoryName} failed!`);
 
                     const config = JSON.parse(fs.readFileSync(path.join(cwd, "test.json"), { encoding: "utf8" })) as UserConfig;
-                    ts.Debug.assert(!!config.types, "Git is the only reason for using test.json right now");
+                    ts.Debug.assert(!!config.types, "Bad format from test.json: Types field must be present.");
                     types = config.types;
 
                     cwd = path.join(cwd, directoryName);