Custom matchers for the espresso tests

Author: kunall17

app/src/androidTest/java/com/zulip/android/helper/Matchers.java

@@ -0,0 +1,117 @@
+package com.zulip.android.helper;
+
+import android.content.res.Resources;
+import android.support.test.espresso.matcher.BoundedMatcher;
+import android.support.v7.widget.RecyclerView;
+import android.view.View;
+import android.widget.TextView;
+
+import com.zulip.android.R;
+import com.zulip.android.models.Message;
+import com.zulip.android.models.MessageType;
+import com.zulip.android.viewholders.MessageHeaderParent;
+import com.zulip.android.viewholders.MessageHolder;
+
+import org.hamcrest.Description;
+import org.hamcrest.Matcher;
+import org.hamcrest.TypeSafeMatcher;
+
+public class Matchers {
+
+    public static Matcher<View> withFirstId(final int id) {
+        return new TypeSafeMatcher<View>() {
+            Resources resources = null;
+            boolean found = false;
+
+            @Override
+            public void describeTo(Description description) {
+                String idDescription = Integer.toString(id);
+                if (resources != null) {
+                    try {
+                        idDescription = resources.getResourceName(id);
+                    } catch (Resources.NotFoundException e) {
+                        // No big deal, will just use the int value.
+                        idDescription = String.format("%s (resource name not found)", id);
+                    }
+                }
+                description.appendText("with id: " + idDescription);
+            }
+
+            @Override
+            public boolean matchesSafely(View view) {
+                if (found) return false;
+                resources = view.getResources();
+                if (id == view.getId()) {
+                    found = true;
+                    return true;
+                }
+                return false;
+            }
+        };
+    }
+
+    public static Matcher<RecyclerView.ViewHolder> withMessageHolderAndClick(final MessageType messageType, final int id) {
+        return new BoundedMatcher<RecyclerView.ViewHolder, MessageHolder>(MessageHolder.class) {
+            private boolean found = false;
+
+            @Override
+            public void describeTo(Description description) {
+                description.appendText("No ViewHolder found with text: " + messageType.toString());
+            }
+
+            @Override
+            protected boolean matchesSafely(MessageHolder item) {
+                if (found) return false;
+                if (item.getLayoutPosition() < 0) return false;
+                Message message = item.onItemClickListener.getMessageAtPosition(item.getLayoutPosition());
+                if (message == null) return false;
+                if (messageType == message.getType()) {
+                    if (id == R.id.contentView) {
+                        item.onItemClickListener.onItemClick(R.id.contentView, item.getLayoutPosition());
+                    }
+                    found = true;
+                    return true;
+                } else {
+                    return false;
+                }
+            }
+        };
+    }
+
+    public static Matcher<RecyclerView.ViewHolder> withMessageHolder(final String text, final int textViewId) {
+        return new BoundedMatcher<RecyclerView.ViewHolder, MessageHolder>(MessageHolder.class) {
+            private boolean found = false;
+
+            @Override
+            public void describeTo(Description description) {
+                description.appendText("No ViewHolder found with text: ");
+            }
+
+            @Override
+            protected boolean matchesSafely(MessageHolder item) {
+                if (found) return false;
+                found = ((TextView) item.itemView.findViewById(textViewId)).getText().toString().matches(text);
+                return found;
+            }
+        };
+    }
+
+    public static Matcher<RecyclerView.ViewHolder> withMessageHeaderHolder(final MessageType messageType) {
+        return new BoundedMatcher<RecyclerView.ViewHolder, MessageHeaderParent.MessageHeaderHolder>(MessageHeaderParent.MessageHeaderHolder.class) {
+            private boolean found = false;
+
+            @Override
+            public void describeTo(Description description) {
+                description.appendText("No ViewHolder found with text: " + messageType.toString());
+            }
+
+            @Override
+            protected boolean matchesSafely(MessageHeaderParent.MessageHeaderHolder item) {
+                if (found) return false;
+                MessageHeaderParent messageHeaderParent = item.onItemClickListener.getMessageHeaderParentAtPosition(item.getLayoutPosition());
+                found = (messageType == messageHeaderParent.getMessageType());
+                return found;
+            }
+        };
+    }
+}