mock API request in test

src/config-utils.test.ts

@@ -36,6 +36,19 @@ function mockGetContents(content: GetContentsResponse): sinon.SinonStub<any, any
   return spyGetContents;
 }
 
+function mockListLanguages(languages: string[]) {
+  // Passing an auth token is required, so we just use a dummy value
+  let client = new github.GitHub('123');
+  const response = {
+    data: {},
+  };
+  for (const language of languages) {
+    response.data[language] = 123;
+  }
+  sinon.stub(client.repos, "listLanguages").resolves(response as any);
+  sinon.stub(api, "getApiClient").value(() => client);
+}
+
 test("load empty config", async t => {
   return await util.withTmpDir(async tmpDir => {
     process.env['RUNNER_TEMP'] = tmpDir;
@@ -348,6 +361,8 @@ test("No detected languages", async t => {
     process.env['RUNNER_TEMP'] = tmpDir;
     process.env['GITHUB_WORKSPACE'] = tmpDir;
 
+    mockListLanguages([]);
+
     try {
       await configUtils.initConfig();
       throw new Error('initConfig did not throw error');

src/config-utils.ts

@@ -442,10 +442,10 @@ async function getLanguagesInRepo(): Promise<Language[]> {
     let repo = repo_nwo[1];
 
     core.debug(`GitHub repo ${owner} ${repo}`);
-    const response = await api.getApiClient(true).request("GET /repos/:owner/:repo/languages", ({
+    const response = await api.getApiClient(true).repos.listLanguages({
       owner,
       repo
-    }));
+    });
 
     core.debug("Languages API response: " + JSON.stringify(response));