1 files changed, 43 insertions, 0 deletions
diff --git a/spec/frontend/ide/lib/editorconfig/rules_mapper_spec.js b/spec/frontend/ide/lib/editorconfig/rules_mapper_spec.js
new file mode 100644
index 00000000000..536b1409435
--- /dev/null
+++ b/spec/frontend/ide/lib/editorconfig/rules_mapper_spec.js
@@ -0,0 +1,43 @@
+import mapRulesToMonaco from '~/ide/lib/editorconfig/rules_mapper';
+
+describe('mapRulesToMonaco', () => {
+  const multipleEntries = {
+    input: { indent_style: 'tab', indent_size: '4', insert_final_newline: 'true' },
+    output: { insertSpaces: false, tabSize: 4, insertFinalNewline: true },
+  };
+
+  // tab width takes precedence
+  const tabWidthAndIndent = {
+    input: { indent_style: 'tab', indent_size: '4', tab_width: '3' },
+    output: { insertSpaces: false, tabSize: 3 },
+  };
+
+  it.each`
+    rule                                     | monacoOption
+    ${{ indent_style: 'tab' }}               | ${{ insertSpaces: false }}
+    ${{ indent_style: 'space' }}             | ${{ insertSpaces: true }}
+    ${{ indent_style: 'unset' }}             | ${{}}
+    ${{ indent_size: '4' }}                  | ${{ tabSize: 4 }}
+    ${{ indent_size: '4.4' }}                | ${{ tabSize: 4 }}
+    ${{ indent_size: '0' }}                  | ${{}}
+    ${{ indent_size: '-10' }}                | ${{}}
+    ${{ indent_size: 'NaN' }}                | ${{}}
+    ${{ tab_width: '4' }}                    | ${{ tabSize: 4 }}
+    ${{ tab_width: '5.4' }}                  | ${{ tabSize: 5 }}
+    ${{ tab_width: '-10' }}                  | ${{}}
+    ${{ trim_trailing_whitespace: 'true' }}  | ${{ trimTrailingWhitespace: true }}
+    ${{ trim_trailing_whitespace: 'false' }} | ${{ trimTrailingWhitespace: false }}
+    ${{ trim_trailing_whitespace: 'unset' }} | ${{}}
+    ${{ end_of_line: 'lf' }}                 | ${{ endOfLine: 0 }}
+    ${{ end_of_line: 'crlf' }}               | ${{ endOfLine: 1 }}
+    ${{ end_of_line: 'cr' }}                 | ${{}}
+    ${{ end_of_line: 'unset' }}              | ${{}}
+    ${{ insert_final_newline: 'true' }}      | ${{ insertFinalNewline: true }}
+    ${{ insert_final_newline: 'false' }}     | ${{ insertFinalNewline: false }}
+    ${{ insert_final_newline: 'unset' }}     | ${{}}
+    ${multipleEntries.input}                 | ${multipleEntries.output}
+    ${tabWidthAndIndent.input}               | ${tabWidthAndIndent.output}
+  `('correctly maps editorconfig rule to monaco option: $rule', ({ rule, monacoOption }) => {
+    expect(mapRulesToMonaco(rule)).toEqual(monacoOption);
+  });
+});