1 files changed, 49 insertions, 0 deletions
diff --git a/app/src/androidTest/java/it/niedermann/nextcloud/deck/util/DeckColorUtilTest.java b/app/src/androidTest/java/it/niedermann/nextcloud/deck/util/DeckColorUtilTest.java
new file mode 100644
index 000000000..10ac5cdc9
--- /dev/null
+++ b/app/src/androidTest/java/it/niedermann/nextcloud/deck/util/DeckColorUtilTest.java
@@ -0,0 +1,49 @@
+package it.niedermann.nextcloud.deck.util;
+
+import android.graphics.Color;
+
+import androidx.core.util.Pair;
+import androidx.test.ext.junit.runners.AndroidJUnit4;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+
+@RunWith(AndroidJUnit4.class)
+public class DeckColorUtilTest {
+
+    @Test
+    public void testContrastRatioIsSufficient() {
+        final List<Pair<Integer, Integer>> sufficientContrastColorPairs = new ArrayList<>();
+        sufficientContrastColorPairs.add(new Pair<>(Color.BLACK, Color.WHITE));
+        sufficientContrastColorPairs.add(new Pair<>(Color.WHITE, Color.parseColor("#0082C9")));
+
+        for (Pair<Integer, Integer> colorPair : sufficientContrastColorPairs) {
+            assert colorPair.first != null;
+            assert colorPair.second != null;
+            assertTrue(
+                    "Expect contrast between " + String.format("#%06X", (0xFFFFFF & colorPair.first)) + " and " + String.format("#%06X", (0xFFFFFF & colorPair.second)) + " to be sufficient",
+                    DeckColorUtil.contrastRatioIsSufficient(colorPair.first, colorPair.second)
+            );
+        }
+
+        final List<Pair<Integer, Integer>> insufficientContrastColorPairs = new ArrayList<>();
+        insufficientContrastColorPairs.add(new Pair<>(Color.WHITE, Color.WHITE));
+        insufficientContrastColorPairs.add(new Pair<>(Color.BLACK, Color.BLACK));
+
+        for (Pair<Integer, Integer> colorPair : insufficientContrastColorPairs) {
+            assert colorPair.first != null;
+            assert colorPair.second != null;
+            assertFalse(
+                    "Expect contrast between " + String.format("#%06X", (0xFFFFFF & colorPair.first)) + " and " + String.format("#%06X", (0xFFFFFF & colorPair.second)) + " to be insufficient",
+                    DeckColorUtil.contrastRatioIsSufficient(colorPair.first, colorPair.second)
+            );
+        }
+    }
+
+}