1 files changed, 35 insertions, 0 deletions
diff --git a/spec/javascripts/locale/ensure_single_line_spec.js b/spec/javascripts/locale/ensure_single_line_spec.js
new file mode 100644
index 00000000000..bbefa8f40f3
--- /dev/null
+++ b/spec/javascripts/locale/ensure_single_line_spec.js
@@ -0,0 +1,35 @@
+import ensureSingleLine from '~/locale/ensure_single_line';
+
+describe('locale', () => {
+  describe('ensureSingleLine', () => {
+    it('should remove newlines at the start of the string', () => {
+      const result = 'Test';
+      expect(ensureSingleLine(`\n${result}`)).toBe(result);
+      expect(ensureSingleLine(`\t\n\t${result}`)).toBe(result);
+      expect(ensureSingleLine(`\r\n${result}`)).toBe(result);
+      expect(ensureSingleLine(`\r\n ${result}`)).toBe(result);
+      expect(ensureSingleLine(`\r ${result}`)).toBe(result);
+      expect(ensureSingleLine(` \n ${result}`)).toBe(result);
+    });
+
+    it('should remove newlines at the end of the string', () => {
+      const result = 'Test';
+      expect(ensureSingleLine(`${result}\n`)).toBe(result);
+      expect(ensureSingleLine(`${result}\t\n\t`)).toBe(result);
+      expect(ensureSingleLine(`${result}\r\n`)).toBe(result);
+      expect(ensureSingleLine(`${result}\r`)).toBe(result);
+      expect(ensureSingleLine(`${result} \r`)).toBe(result);
+      expect(ensureSingleLine(`${result} \r\n `)).toBe(result);
+    });
+
+    it('should replace newlines in the middle of the string with a single space', () => {
+      const result = 'Test';
+      expect(ensureSingleLine(`${result}\n${result}`)).toBe(`${result} ${result}`);
+      expect(ensureSingleLine(`${result}\t\n\t${result}`)).toBe(`${result} ${result}`);
+      expect(ensureSingleLine(`${result}\r\n${result}`)).toBe(`${result} ${result}`);
+      expect(ensureSingleLine(`${result}\r${result}`)).toBe(`${result} ${result}`);
+      expect(ensureSingleLine(`${result} \r${result}`)).toBe(`${result} ${result}`);
+      expect(ensureSingleLine(`${result} \r\n ${result}`)).toBe(`${result} ${result}`);
+    });
+  });
+});