test: Add FlatESLint tests with missing config files (#17164)

mdjermanovic · web-flow · commit f67d2984c3c3 · 2023-05-29T14:48:12.000-04:00
* test: Add `FlatESLint` tests with missing config files

* assert ENOENT
diff --git a/tests/lib/eslint/flat-eslint.js b/tests/lib/eslint/flat-eslint.js
@@ -682,6 +682,37 @@ describe("FlatESLint", () => {
             );
         });
 
+        it("should throw if eslint.config.js file is not present", async () => {
+            eslint = new FlatESLint({
+                cwd: getFixturePath("..")
+            });
+            await assert.rejects(() => eslint.lintText("var foo = 'bar';"), /Could not find config file/u);
+        });
+
+        it("should not throw if eslint.config.js file is not present and overrideConfigFile is `true`", async () => {
+            eslint = new FlatESLint({
+                cwd: getFixturePath(".."),
+                overrideConfigFile: true
+            });
+            await eslint.lintText("var foo = 'bar';");
+        });
+
+        it("should not throw if eslint.config.js file is not present and overrideConfigFile is path to a config file", async () => {
+            eslint = new FlatESLint({
+                cwd: getFixturePath(".."),
+                overrideConfigFile: "fixtures/configurations/quotes-error.js"
+            });
+            await eslint.lintText("var foo = 'bar';");
+        });
+
+        it("should throw if overrideConfigFile is path to a file that doesn't exist", async () => {
+            eslint = new FlatESLint({
+                cwd: getFixturePath(""),
+                overrideConfigFile: "does-not-exist.js"
+            });
+            await assert.rejects(() => eslint.lintText("var foo = 'bar';"), { code: "ENOENT" });
+        });
+
         it("should throw if non-string value is given to 'code' parameter", async () => {
             eslint = new FlatESLint();
             await assert.rejects(() => eslint.lintText(100), /'code' must be a string/u);
@@ -797,6 +828,37 @@ describe("FlatESLint", () => {
             assert.strictEqual(results[0].suppressedMessages.length, 0);
         });
 
+        it("should throw if eslint.config.js file is not present", async () => {
+            eslint = new FlatESLint({
+                cwd: getFixturePath("..")
+            });
+            await assert.rejects(() => eslint.lintFiles("fixtures/undef*.js"), /Could not find config file/u);
+        });
+
+        it("should not throw if eslint.config.js file is not present and overrideConfigFile is `true`", async () => {
+            eslint = new FlatESLint({
+                cwd: getFixturePath(".."),
+                overrideConfigFile: true
+            });
+            await eslint.lintFiles("fixtures/undef*.js");
+        });
+
+        it("should not throw if eslint.config.js file is not present and overrideConfigFile is path to a config file", async () => {
+            eslint = new FlatESLint({
+                cwd: getFixturePath(".."),
+                overrideConfigFile: "fixtures/configurations/quotes-error.js"
+            });
+            await eslint.lintFiles("fixtures/undef*.js");
+        });
+
+        it("should throw if overrideConfigFile is path to a file that doesn't exist", async () => {
+            eslint = new FlatESLint({
+                cwd: getFixturePath(),
+                overrideConfigFile: "does-not-exist.js"
+            });
+            await assert.rejects(() => eslint.lintFiles("undef*.js"), { code: "ENOENT" });
+        });
+
         it("should throw an error when given a config file and a valid file and invalid parser", async () => {
             eslint = new FlatESLint({
                 overrideConfig: {
