1 files changed, 150 insertions, 0 deletions
diff --git a/devtools/shared/tests/xpcshell/test_indentation.js b/devtools/shared/tests/xpcshell/test_indentation.js
new file mode 100644
index 0000000000..7ed84c6a87
--- /dev/null
+++ b/devtools/shared/tests/xpcshell/test_indentation.js
@@ -0,0 +1,150 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+const {
+  EXPAND_TAB,
+  TAB_SIZE,
+  DETECT_INDENT,
+  getTabPrefs,
+  getIndentationFromPrefs,
+  getIndentationFromIteration,
+  getIndentationFromString,
+} = require("resource://devtools/shared/indentation.js");
+
+function test_indent_from_prefs() {
+  Services.prefs.setBoolPref(DETECT_INDENT, true);
+  equal(
+    getIndentationFromPrefs(),
+    false,
+    "getIndentationFromPrefs returning false"
+  );
+
+  Services.prefs.setIntPref(TAB_SIZE, 73);
+  Services.prefs.setBoolPref(EXPAND_TAB, false);
+  Services.prefs.setBoolPref(DETECT_INDENT, false);
+  deepEqual(
+    getTabPrefs(),
+    { indentUnit: 73, indentWithTabs: true },
+    "getTabPrefs basic test"
+  );
+  deepEqual(
+    getIndentationFromPrefs(),
+    { indentUnit: 73, indentWithTabs: true },
+    "getIndentationFromPrefs basic test"
+  );
+}
+
+const TESTS = [
+  {
+    desc: "two spaces",
+    input: [
+      "/*",
+      " * tricky comment block",
+      " */",
+      "div {",
+      "  color: red;",
+      "  background: blue;",
+      "}",
+      "     ",
+      "span {",
+      "  padding-left: 10px;",
+      "}",
+    ],
+    expected: { indentUnit: 2, indentWithTabs: false },
+  },
+  {
+    desc: "four spaces",
+    input: [
+      "var obj = {",
+      "    addNumbers: function() {",
+      "        var x = 5;",
+      "        var y = 18;",
+      "        return x + y;",
+      "    },",
+      "   ",
+      "    /*",
+      "     * Do some stuff to two numbers",
+      "     * ",
+      "     * @param x",
+      "     * @param y",
+      "     * ",
+      "     * @return the result of doing stuff",
+      "     */",
+      "    subtractNumbers: function(x, y) {",
+      "        var x += 7;",
+      "        var y += 18;",
+      "        var result = x - y;",
+      "        result %= 2;",
+      "    }",
+      "}",
+    ],
+    expected: { indentUnit: 4, indentWithTabs: false },
+  },
+  {
+    desc: "tabs",
+    input: [
+      "/*",
+      " * tricky comment block",
+      " */",
+      "div {",
+      "\tcolor: red;",
+      "\tbackground: blue;",
+      "}",
+      "",
+      "span {",
+      "\tpadding-left: 10px;",
+      "}",
+    ],
+    expected: { indentUnit: 2, indentWithTabs: true },
+  },
+  {
+    desc: "no indent",
+    input: [
+      "var x = 0;",
+      "           // stray thing",
+      "var y = 9;",
+      "    ",
+      "",
+    ],
+    expected: { indentUnit: 2, indentWithTabs: false },
+  },
+];
+
+function test_indent_detection() {
+  Services.prefs.setIntPref(TAB_SIZE, 2);
+  Services.prefs.setBoolPref(EXPAND_TAB, true);
+  Services.prefs.setBoolPref(DETECT_INDENT, true);
+
+  for (const test of TESTS) {
+    const iterFn = function (start, end, callback) {
+      test.input.slice(start, end).forEach(callback);
+    };
+
+    deepEqual(
+      getIndentationFromIteration(iterFn),
+      test.expected,
+      "test getIndentationFromIteration " + test.desc
+    );
+  }
+
+  for (const test of TESTS) {
+    deepEqual(
+      getIndentationFromString(test.input.join("\n")),
+      test.expected,
+      "test getIndentationFromString " + test.desc
+    );
+  }
+}
+
+function run_test() {
+  try {
+    test_indent_from_prefs();
+    test_indent_detection();
+  } finally {
+    Services.prefs.clearUserPref(TAB_SIZE);
+    Services.prefs.clearUserPref(EXPAND_TAB);
+    Services.prefs.clearUserPref(DETECT_INDENT);
+  }
+}