tweak skiping opencv4nodejs

Author: KazuCocoa

test/functional/android/android/image_comparison_test.rb

@@ -16,7 +16,7 @@ def teardown
       end
 
       def test_image_comparison_match_result
-        skip 'Requres `npm install -g appium opencv4nodejs`' if `which opencv4nodejs`.empty?
+        skip 'Requres `npm install -g appium opencv4nodejs`' unless `npm list -g opencv4nodejs`.include? 'opencv4nodejs'
 
         image1 = File.read AppiumLibCoreTest.path_of('test/functional/data/test_normal.png')
         image2 = File.read AppiumLibCoreTest.path_of('test/functional/data/test_has_blue.png')
@@ -33,7 +33,7 @@ def test_image_comparison_match_result
       end
 
       def test_image_comparison_find_result
-        skip 'Requres `npm install -g appium opencv4nodejs`' if `which opencv4nodejs`.empty?
+        skip 'Requres `npm install -g appium opencv4nodejs`' unless `npm list -g opencv4nodejs`.include? 'opencv4nodejs'
 
         image1 = File.read AppiumLibCoreTest.path_of('test/functional/data/test_normal.png')
         image2 = File.read AppiumLibCoreTest.path_of('test/functional/data/test_has_blue.png')
@@ -50,7 +50,7 @@ def test_image_comparison_find_result
       end
 
       def test_image_comparison_get_images_result
-        skip 'Requres `npm install -g appium opencv4nodejs`' if `which opencv4nodejs`.empty?
+        skip 'Requres `npm install -g appium opencv4nodejs`' unless `npm list -g opencv4nodejs`.include? 'opencv4nodejs'
 
         image1 = File.read AppiumLibCoreTest.path_of('test/functional/data/test_normal.png')
         image2 = File.read AppiumLibCoreTest.path_of('test/functional/data/test_has_blue.png')

test/functional/ios/ios/device_test.rb

@@ -12,7 +12,7 @@ def setup
       end
 
       def test_image_element
-        skip 'Requres `npm install -g appium opencv4nodejs`' if `which opencv4nodejs`.empty?
+        skip 'Requres `npm install -g appium opencv4nodejs`' unless `npm list -g opencv4nodejs`.include? 'opencv4nodejs'
 
         @@driver.update_settings({ fixImageFindScreenshotDims: false,
                                    fixImageTemplateSize: true,
@@ -35,7 +35,7 @@ def test_image_element
       end
 
       def test_image_elements
-        skip 'Requres `npm install -g appium opencv4nodejs`' if `which opencv4nodejs`.empty?
+        skip 'Requres `npm install -g appium opencv4nodejs`' unless `npm list -g opencv4nodejs`.include? 'opencv4nodejs'
 
         @@driver.update_settings({ fixImageTemplateSize: true,
                                    autoUpdateImageElementPosition: true })

test/functional/ios/ios/image_comparison_test.rb

@@ -14,7 +14,7 @@ def setup
       end
 
       def test_image_comparison_match_result
-        skip 'Requres `npm install -g appium opencv4nodejs`' if `which opencv4nodejs`.empty?
+        skip 'Requres `npm install -g appium opencv4nodejs`' unless `npm list -g opencv4nodejs`.include? 'opencv4nodejs'
 
         image1 = File.read './test/functional/data/test_normal.png'
         image2 = File.read './test/functional/data/test_has_blue.png'
@@ -31,7 +31,7 @@ def test_image_comparison_match_result
       end
 
       def test_image_comparison_find_result
-        skip 'Requres `npm install -g appium opencv4nodejs`' if `which opencv4nodejs`.empty?
+        skip 'Requres `npm install -g appium opencv4nodejs`' unless `npm list -g opencv4nodejs`.include? 'opencv4nodejs'
 
         image1 = File.read './test/functional/data/test_normal.png'
         image2 = File.read './test/functional/data/test_has_blue.png'
@@ -48,7 +48,7 @@ def test_image_comparison_find_result
       end
 
       def test_image_comparison_get_images_result
-        skip 'Requres `npm install -g appium opencv4nodejs`' if `which opencv4nodejs`.empty?
+        skip 'Requres `npm install -g appium opencv4nodejs`' unless `npm list -g opencv4nodejs`.include? 'opencv4nodejs'
 
         image1 = File.read './test/functional/data/test_normal.png'
         image2 = File.read './test/functional/data/test_has_blue.png'