tunnel: Add an initial set of unit tests

Includes a control set of broken configuration files that we attempt to parse and
verify that the parser fails in a predictable and consistent manner.

Signed-off-by: Harsh Shandilya <me@msfjarvis.dev>

2 files changed, 217 insertions, 0 deletions

diff --git a/tunnel/src/test/java/com/wireguard/config/BadConfigExceptionTest.java b/tunnel/src/test/java/com/wireguard/config/BadConfigExceptionTest.java
new file mode 100644
index 00000000..54935510
--- /dev/null
+++ b/tunnel/src/test/java/com/wireguard/config/BadConfigExceptionTest.java
@@ -0,0 +1,172 @@
+/*
+ * Copyright © 2020 WireGuard LLC. All Rights Reserved.
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+package com.wireguard.config;
+
+import com.wireguard.config.BadConfigException.Location;
+import com.wireguard.config.BadConfigException.Reason;
+import com.wireguard.config.BadConfigException.Section;
+
+import org.junit.AfterClass;
+import org.junit.BeforeClass;
+import org.junit.Test;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.HashMap;
+import java.util.Map;
+
+import static org.junit.Assert.*;
+
+public class BadConfigExceptionTest {
+    private static final String[] CONFIG_NAMES = {
+            "invalid-key",
+            "invalid-number",
+            "invalid-value",
+            "missing-attribute",
+            "missing-section",
+            "syntax-error",
+            "unknown-attribute",
+            "unknown-section"
+    };
+    private static final Map<String, InputStream> CONFIG_MAP = new HashMap<>();
+
+    @BeforeClass
+    public static void readConfigs() {
+        for (final String config: CONFIG_NAMES) {
+            CONFIG_MAP.put(config, BadConfigExceptionTest.class.getClassLoader().getResourceAsStream(config + ".conf"));
+        }
+    }
+
+    @AfterClass
+    public static void closeStreams() {
+        for (final InputStream inputStream : CONFIG_MAP.values()) {
+            try {
+                inputStream.close();
+            } catch (final IOException ignored) {
+            }
+        }
+    }
+
+    @Test
+    public void throws_correctly_with_INVALID_KEY_reason() {
+        try {
+            Config.parse(CONFIG_MAP.get("invalid-key"));
+            fail("Config parsing must fail in this test");
+        } catch (final BadConfigException e) {
+            assertEquals(e.getReason(), Reason.INVALID_KEY);
+            assertEquals(e.getLocation(), Location.PUBLIC_KEY);
+            assertEquals(e.getSection(), Section.PEER);
+        } catch (final IOException e) {
+            e.printStackTrace();
+            fail("IOException thrown during test");
+        }
+    }
+
+    @Test
+    public void throws_correctly_with_INVALID_NUMBER_reason() {
+        try {
+            Config.parse(CONFIG_MAP.get("invalid-number"));
+            fail("Config parsing must fail in this test");
+        } catch (final BadConfigException e) {
+            assertEquals(e.getReason(), Reason.INVALID_NUMBER);
+            assertEquals(e.getLocation(), Location.PERSISTENT_KEEPALIVE);
+            assertEquals(e.getSection(), Section.PEER);
+        } catch (final IOException e) {
+            e.printStackTrace();
+            fail("IOException thrown during test");
+        }
+    }
+
+    @Test
+    public void throws_correctly_with_INVALID_VALUE_reason() {
+        try {
+            Config.parse(CONFIG_MAP.get("invalid-value"));
+            fail("Config parsing must fail in this test");
+        } catch (final BadConfigException e) {
+            assertEquals(e.getReason(), Reason.INVALID_VALUE);
+            assertEquals(e.getLocation(), Location.DNS);
+            assertEquals(e.getSection(), Section.INTERFACE);
+        } catch (final IOException e) {
+            e.printStackTrace();
+            fail("IOException throwing during test");
+        }
+    }
+
+    @Test
+    public void throws_correctly_with_MISSING_ATTRIBUTE_reason() {
+        try {
+            Config.parse(CONFIG_MAP.get("missing-attribute"));
+            fail("Config parsing must fail in this test");
+        } catch (final BadConfigException e) {
+            assertEquals(e.getReason(), Reason.MISSING_ATTRIBUTE);
+            assertEquals(e.getLocation(), Location.PUBLIC_KEY);
+            assertEquals(e.getSection(), Section.PEER);
+        } catch (final IOException e) {
+            e.printStackTrace();
+            fail("IOException throwing during test");
+        }
+    }
+
+    @Test
+    public void throws_correctly_with_MISSING_SECTION_reason() {
+        try {
+            Config.parse(CONFIG_MAP.get("missing-section"));
+            fail("Config parsing must fail in this test");
+        } catch (final BadConfigException e) {
+            assertEquals(e.getReason(), Reason.MISSING_SECTION);
+            assertEquals(e.getLocation(), Location.TOP_LEVEL);
+            assertEquals(e.getSection(), Section.CONFIG);
+        } catch (final IOException e) {
+            e.printStackTrace();
+            fail("IOException throwing during test");
+        }
+    }
+
+    @Test
+    public void throws_correctly_with_SYNTAX_ERROR_reason() {
+        try {
+            Config.parse(CONFIG_MAP.get("syntax-error"));
+            fail("Config parsing must fail in this test");
+        } catch (final BadConfigException e) {
+            assertEquals(e.getReason(), Reason.SYNTAX_ERROR);
+            assertEquals(e.getLocation(), Location.TOP_LEVEL);
+            assertEquals(e.getSection(), Section.PEER);
+        } catch (final IOException e) {
+            e.printStackTrace();
+            fail("IOException throwing during test");
+        }
+    }
+
+    @Test
+    public void throws_correctly_with_UNKNOWN_ATTRIBUTE_reason() {
+        try {
+            Config.parse(CONFIG_MAP.get("unknown-attribute"));
+            fail("Config parsing must fail in this test");
+        } catch (final BadConfigException e) {
+            assertEquals(e.getReason(), Reason.UNKNOWN_ATTRIBUTE);
+            assertEquals(e.getLocation(), Location.TOP_LEVEL);
+            assertEquals(e.getSection(), Section.PEER);
+        } catch (final IOException e) {
+            e.printStackTrace();
+            fail("IOException throwing during test");
+        }
+    }
+
+    @Test
+    public void throws_correctly_with_UNKNOWN_SECTION_reason() {
+        try {
+            Config.parse(CONFIG_MAP.get("unknown-section"));
+            fail("Config parsing must fail in this test");
+        } catch (final BadConfigException e) {
+            assertEquals(e.getReason(), Reason.UNKNOWN_SECTION);
+            assertEquals(e.getLocation(), Location.TOP_LEVEL);
+            assertEquals(e.getSection(), Section.CONFIG);
+        } catch (final IOException e) {
+            e.printStackTrace();
+            fail("IOException throwing during test");
+        }
+    }
+}
diff --git a/tunnel/src/test/java/com/wireguard/config/ConfigTest.java b/tunnel/src/test/java/com/wireguard/config/ConfigTest.java
new file mode 100644
index 00000000..6d599217
--- /dev/null
+++ b/tunnel/src/test/java/com/wireguard/config/ConfigTest.java
@@ -0,0 +1,45 @@
+/*
+ * Copyright © 2020 WireGuard LLC. All Rights Reserved.
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+package com.wireguard.config;
+
+import static org.junit.Assert.*;
+import org.junit.Test;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.HashSet;
+import java.util.Objects;
+
+public class ConfigTest {
+
+    @Test
+    public void valid_config_parses_correctly() throws IOException, ParseException {
+        Config config = null;
+        final Collection<InetNetwork> expectedAllowedIps = new HashSet<>(Arrays.asList(InetNetwork.parse("0.0.0.0/0"), InetNetwork.parse("::0/0")));
+        try (final InputStream is = Objects.requireNonNull(getClass().getClassLoader()).getResourceAsStream("working.conf")) {
+            config = Config.parse(is);
+        } catch (final BadConfigException e) {
+            fail("'working.conf' should never fail to parse");
+        }
+        assertNotNull("config cannot be null after parsing", config);
+        assertTrue(
+                "No applications should be excluded by default",
+                config.getInterface().getExcludedApplications().isEmpty()
+        );
+        assertEquals("Test config has exactly one peer", 1, config.getPeers().size());
+        assertEquals("Test config's allowed IPs are 0.0.0.0/0 and ::0/0", config.getPeers().get(0).getAllowedIps(), expectedAllowedIps);
+        assertEquals("Test config has one DNS server", 1, config.getInterface().getDnsServers().size());
+    }
+
+    @Test(expected = BadConfigException.class)
+    public void invalid_config_throws() throws IOException, BadConfigException {
+        try (final InputStream is = Objects.requireNonNull(getClass().getClassLoader()).getResourceAsStream("broken.conf")) {
+            Config.parse(is);
+        }
+    }
+}