Improve Java examples

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MOS_MIGRATED_REVID=86787893

4 files changed, 114 insertions, 0 deletions

diff --git a/base_workspace/examples/java-native/src/test/java/com/example/myproject/BUILD b/base_workspace/examples/java-native/src/test/java/com/example/myproject/BUILD
new file mode 100644
index 0000000000..838107650c
--- /dev/null
+++ b/base_workspace/examples/java-native/src/test/java/com/example/myproject/BUILD
@@ -0,0 +1,33 @@
+java_test(
+    name = "hello",
+    srcs = ["TestHello.java"],
+    deps = [
+        "//examples/java-native/src/main/java/com/example/myproject:hello-lib",
+        "//third_party:junit4",
+    ],
+)
+
+java_test(
+    name = "custom",
+    srcs = ["TestCustomGreeting.java"],
+    deps = [
+        "//examples/java-native/src/main/java/com/example/myproject:custom-greeting",
+        "//third_party:junit4",
+    ],
+)
+
+java_test(
+    name = "fail",
+    srcs = ["Fail.java"],
+    deps = ["//third_party:junit4"],
+)
+
+# This attempts to run TestCustomGreeting.java without any resources, so fails.
+java_test(
+    name = "resource-fail",
+    srcs = glob(["Test*.java"]),
+    deps = [
+        "//examples/java-native/src/main/java/com/example/myproject:hello-lib",
+        "//third_party:junit4",
+    ],
+)
diff --git a/base_workspace/examples/java-native/src/test/java/com/example/myproject/Fail.java b/base_workspace/examples/java-native/src/test/java/com/example/myproject/Fail.java
new file mode 100644
index 0000000000..7b947c6e96
--- /dev/null
+++ b/base_workspace/examples/java-native/src/test/java/com/example/myproject/Fail.java
@@ -0,0 +1,14 @@
+package com.example.myproject;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+/**
+ * A test that always fails.
+ */
+public class Fail {
+  @Test
+  public void testFail() {
+    Assert.fail("This is an expected test failure.");
+  }
+}
diff --git a/base_workspace/examples/java-native/src/test/java/com/example/myproject/TestCustomGreeting.java b/base_workspace/examples/java-native/src/test/java/com/example/myproject/TestCustomGreeting.java
new file mode 100644
index 0000000000..f14b7d234a
--- /dev/null
+++ b/base_workspace/examples/java-native/src/test/java/com/example/myproject/TestCustomGreeting.java
@@ -0,0 +1,32 @@
+package com.example.myproject;
+
+import static org.junit.Assert.assertEquals;
+
+import org.junit.Test;
+
+import java.io.ByteArrayOutputStream;
+import java.io.PrintStream;
+import java.nio.charset.StandardCharsets;
+
+/**
+ * Tests using a resource file to replace "Hello" in the output.
+ */
+public class TestCustomGreeting {
+
+  @Test
+  public void testNoArgument() throws Exception {
+    ByteArrayOutputStream out = new ByteArrayOutputStream();
+    Greeter.out = new PrintStream(out);
+    Greeter.main();
+    assertEquals("Bye world\n", new String(out.toByteArray(), StandardCharsets.UTF_8));
+  }
+
+  @Test
+  public void testWithArgument() throws Exception {
+    ByteArrayOutputStream out = new ByteArrayOutputStream();
+    Greeter.out = new PrintStream(out);
+    Greeter.main("toto");
+    assertEquals("Bye toto\n", new String(out.toByteArray(), StandardCharsets.UTF_8));
+  }
+
+}
diff --git a/base_workspace/examples/java-native/src/test/java/com/example/myproject/TestHello.java b/base_workspace/examples/java-native/src/test/java/com/example/myproject/TestHello.java
new file mode 100644
index 0000000000..d50e6e503f
--- /dev/null
+++ b/base_workspace/examples/java-native/src/test/java/com/example/myproject/TestHello.java
@@ -0,0 +1,35 @@
+package com.example.myproject;
+
+import static org.junit.Assert.assertEquals;
+
+import org.junit.Test;
+
+import java.io.ByteArrayOutputStream;
+import java.io.PrintStream;
+import java.nio.charset.StandardCharsets;
+
+/**
+ * Tests different numbers of arguments to main().
+ *
+ * <p>With an empty args array, {@link Greeter} should print "Hello world". If there are one or more
+ * args, {@link Greeter} should print "Hello &lt;arg[0]&gt;".</p>
+ */
+public class TestHello {
+
+  @Test
+  public void testNoArgument() throws Exception {
+    ByteArrayOutputStream out = new ByteArrayOutputStream();
+    Greeter.out = new PrintStream(out);
+    Greeter.main();
+    assertEquals("Hello world\n", new String(out.toByteArray(), StandardCharsets.UTF_8));
+  }
+
+  @Test
+  public void testWithArgument() throws Exception {
+    ByteArrayOutputStream out = new ByteArrayOutputStream();
+    Greeter.out = new PrintStream(out);
+    Greeter.main("toto");
+    assertEquals("Hello toto\n", new String(out.toByteArray(), StandardCharsets.UTF_8));
+  }
+
+}