CtsNetTests: Add a test for b/25624963

Ensure that password is not output in toString() for an enterprise
credential.

Bug: 25624963
Test: Run this CTS test: run cts --module CtsNetTestCases --test android.net.wifi.cts.WifiEnterpriseConfigTest#testEnterpriseConfigDoesNotPrintPassword
Change-Id: I84a62ae5d37aa7d397203f41362dadb8ceba1e62
diff --git a/tests/cts/net/src/android/net/wifi/cts/WifiEnterpriseConfigTest.java b/tests/cts/net/src/android/net/wifi/cts/WifiEnterpriseConfigTest.java
index f3eb4e9..a074f14 100644
--- a/tests/cts/net/src/android/net/wifi/cts/WifiEnterpriseConfigTest.java
+++ b/tests/cts/net/src/android/net/wifi/cts/WifiEnterpriseConfigTest.java
@@ -532,4 +532,15 @@
         }
         return false;
     }
+
+    public void testEnterpriseConfigDoesNotPrintPassword() {
+        WifiEnterpriseConfig enterpriseConfig = new WifiEnterpriseConfig();
+        final String identity = "IdentityIsOkayToBeDisplayedHere";
+        final String password = "PasswordIsNotOkayToBeDisplayedHere";
+        enterpriseConfig.setIdentity(identity);
+        enterpriseConfig.setPassword(password);
+        final String stringRepresentation = enterpriseConfig.toString();
+        assertTrue(stringRepresentation.contains(identity));
+        assertFalse(stringRepresentation.contains(password));
+    }
 }