Add unit tests

Author: planarvoid

aztec/src/main/kotlin/org/wordpress/aztec/AztecText.kt

@@ -43,7 +43,6 @@ import android.text.TextWatcher
 import android.text.style.SuggestionSpan
 import android.util.AttributeSet
 import android.util.DisplayMetrics
-import android.util.Log
 import android.view.KeyEvent
 import android.view.LayoutInflater
 import android.view.MotionEvent
@@ -346,7 +345,6 @@ open class AztecText : AppCompatEditText, TextWatcher, UnknownHtmlSpan.OnUnknown
     }
 
     fun setCalypsoMode(isCompatibleWithCalypso: Boolean) {
-        Log.d("testing", "for the sake of testing")
         isInCalypsoMode = isCompatibleWithCalypso
     }
 

aztec/src/test/kotlin/org/wordpress/aztec/AztecContentChangeWatcherTest.kt

@@ -0,0 +1,73 @@
+package org.wordpress.aztec
+
+import org.junit.Assert.*
+import org.junit.Before
+import org.junit.Test
+import org.junit.runner.RunWith
+import org.junit.runners.JUnit4
+
+@RunWith(JUnit4::class)
+class AztecContentChangeWatcherTest {
+    private lateinit var aztecContentChangeWatcher: AztecContentChangeWatcher
+    @Before
+    fun setUp() {
+        aztecContentChangeWatcher = AztecContentChangeWatcher()
+    }
+
+    @Test
+    fun `notifies registered observer`() {
+        // Given
+        var contentChanged = false
+        setupRegisteredObserver {
+            contentChanged = true
+        }
+
+        // When
+        aztecContentChangeWatcher.notifyContentChanged()
+
+        // Then
+        assertTrue(contentChanged)
+    }
+
+    @Test
+    fun `does not notify unregistered observer`() {
+        // Given
+        var contentChanged = false
+        val observer = setupRegisteredObserver {
+            contentChanged = true
+        }
+
+        // When
+        aztecContentChangeWatcher.unregisterObserver(observer)
+        aztecContentChangeWatcher.notifyContentChanged()
+
+        // Then
+        assertFalse(contentChanged)
+    }
+
+    @Test
+    fun `observer is garbage collected and reference is lost`() {
+        // Given
+        var contentChanged = false
+        setupRegisteredObserver {
+            contentChanged = true
+        }
+        System.gc()
+
+        // When
+        aztecContentChangeWatcher.notifyContentChanged()
+
+        // Then
+        assertFalse(contentChanged)
+    }
+
+    private fun setupRegisteredObserver(onContentChanged: () -> Unit): AztecContentChangeWatcher.AztecTextChangeObserver {
+        val observer = object : AztecContentChangeWatcher.AztecTextChangeObserver {
+            override fun onContentChanged() {
+                onContentChanged()
+            }
+        }
+        aztecContentChangeWatcher.registerObserver(observer)
+        return observer
+    }
+}