Original patch from issue 570048

chrome/test/data/extensions/api_test/tabs/zoom_getset/test.html

+<script>
+
+var blankURL = chrome.extension.getURL('blank.html');
+
+// Not sure if this precaution is necessary
+function assertFloatEq(a, b) {
+  var epsilon = 0.00001;
+  chrome.test.assertTrue(Math.abs(a - b) < epsilon);
+}
+
+chrome.test.runTests([
+  function getSet() {
+    var expectedZoomPercent = 120;
+
+    chrome.tabs.create({ url: blankURL }, function(tab) {
+      chrome.tabs.setZoomPercent(tab.id, expectedZoomPercent,
+                                 function(actualZoomPercent1) {
+        assertFloatEq(expectedZoomPercent, actualZoomPercent1);
+
+        chrome.tabs.getZoomPercent(tab.id, function(actualZoomPercent2) {
+          assertFloatEq(expectedZoomPercent, actualZoomPercent2);
+          chrome.test.succeed();
+        });
+      });
+    });
+  },
+
+  function setReal() {
+    // This will be treated as a real number internally
+    var expectedZoomPercent = 120.11;
+
+    chrome.tabs.create({ url: blankURL }, function(tab) {
+      chrome.tabs.setZoomPercent(tab.id, expectedZoomPercent,
+                                 function(actualZoomPercent) {
+        assertFloatEq(expectedZoomPercent, actualZoomPercent);
+        chrome.test.succeed();
+      });
+    });
+  },
+
+  function setInteger() {
+    // This will be treated as an integer internally
+    var expectedZoomPercent = 120;
+
+    chrome.tabs.create({ url: blankURL }, function(tab) {
+      chrome.tabs.setZoomPercent(tab.id, expectedZoomPercent,
+                                 function(actualZoomPercent) {
+        assertFloatEq(expectedZoomPercent, actualZoomPercent);
+        chrome.test.succeed();
+      });
+    });
+  },
+
+  function setAboveLimit() {
+    var requestedZoomPercent = 400;
+    var expectedZoomPercent = 300; // The max zoom
+
+    chrome.tabs.create({ url: blankURL }, function(tab) {
+      chrome.tabs.setZoomPercent(tab.id, requestedZoomPercent,
+                                 function(actualZoomPercent) {
+        assertFloatEq(expectedZoomPercent, actualZoomPercent);
+        chrome.test.succeed();
+      });
+    });
+  },
+
+  function setBelowLimit() {
+    var requestedZoomPercent = 10;
+    var expectedZoomPercent = 50; // The min zoom
+
+    chrome.tabs.create({ url: blankURL }, function(tab) {
+      chrome.tabs.setZoomPercent(tab.id, requestedZoomPercent,
+                                 function(actualZoomPercent) {
+        assertFloatEq(expectedZoomPercent, actualZoomPercent);
+        chrome.test.succeed();
+      });
+    });
+  },
+
+  function setZero() {
+    var requestedZoomPercent = 0;
+    var expectedZoomPercent = 50;
+
+    chrome.tabs.create({ url: blankURL }, function(tab) {
+      chrome.tabs.setZoomPercent(tab.id, requestedZoomPercent,
+                                 function(actualZoomPercent) {
+        assertFloatEq(expectedZoomPercent, actualZoomPercent);
+        chrome.test.succeed();
+      });
+    });
+  },
+
+  function setNegative() {
+    var requestedZoomPercent = -1;
+    var expectedZoomPercent = 100;
+
+    chrome.tabs.create({ url: blankURL }, function(tab) {
+      try {
+        chrome.tabs.setZoomPercent(tab.id, requestedZoomPercent);
+      } catch (err) {
+        chrome.test.assertEq(
+            'Invalid value for argument 2. Value must not be less than 0.',
+            err.message);
+        chrome.test.succeed();
+        return;
+      }
+
+      chrome.test.fail('Expected error');
+    });
+  },
+
+  function setNaN() {
+    var requestedZoomPercent = Number.NaN;
+    var expectedZoomPercent = 100;
+
+    chrome.tabs.create({ url: blankURL }, function(tab) {
+      try {
+        chrome.tabs.setZoomPercent(tab.id, requestedZoomPercent);
+      } catch (err) {
+        chrome.test.assertEq(
+            'Invalid value for argument 2. Value must not be NaN.',
+            err.message);
+        chrome.test.succeed();
+        return;
+      }
+
+      chrome.test.fail('Expected error');
+    });
+  },
+
+  function setBadTabId() {
+    chrome.tabs.setZoomPercent(12345, 100, function() {
+      chrome.test.assertEq('No tab with id: 12345.',
+                           chrome.extension.lastError.message);
+      chrome.test.succeed();
+    });
+  },
+
+  function getBadTabId() {
+    chrome.tabs.getZoomPercent(12345, function() {
+      chrome.test.assertEq('No tab with id: 12345.',
+                           chrome.extension.lastError.message);
+      chrome.test.succeed();
+    });
+  }
+
+]);
+
+</script>