Trim message bodies at display time.

app/src/test/java/org/thoughtcrime/securesms/util/StringUtilTest_trim.java

@@ -0,0 +1,59 @@
+package org.thoughtcrime.securesms.util;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.Parameterized;
+
+import java.util.Arrays;
+import java.util.Collection;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotSame;
+import static org.junit.Assert.assertSame;
+
+@RunWith(Parameterized.class)
+public final class StringUtilTest_trim {
+
+  private final CharSequence input;
+  private final CharSequence expected;
+  private final boolean      changed;
+
+  @Parameterized.Parameters
+  public static Collection<Object[]> data() {
+    return Arrays.asList(new Object[][]{
+      { "",        "",       false },
+      { " ",       "",       true },
+      { "   ",     "",       true },
+      { "\n",      "",       true},
+      { "\n\n\n",  "",       true },
+      { "A",       "A",      false },
+      { "A ",      "A",      true },
+      { " A",      "A",      true },
+      { " A ",     "A",      true },
+      { "\nA\n",   "A",      true },
+      { "A\n\n",   "A",      true },
+      { "A\n\nB",  "A\n\nB", false },
+      { "A\n\nB ", "A\n\nB", true },
+      { "A  B",    "A  B",   false },
+    });
+  }
+
+  public StringUtilTest_trim(CharSequence input, CharSequence expected, boolean changed) {
+    this.input    = input;
+    this.expected = expected;
+    this.changed  = changed;
+  }
+
+  @Test
+  public void trim() {
+    CharSequence output = StringUtil.trim(input);
+    assertEquals(expected, output);
+
+    if (changed) {
+      assertNotSame(output, input);
+    } else {
+      assertSame(output, input);
+    }
+  }
+
+}