add a test case

Author: lijunchen

crates/moon/tests/test_cases/general.in/.gitignore

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+target/
+.mooncakes/

crates/moon/tests/test_cases/general.in/README.md

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+# username/hello

crates/moon/tests/test_cases/general.in/moon.mod.json

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+{
+  "name": "username/hello",
+  "version": "0.1.0",
+  "readme": "README.md",
+  "repository": "",
+  "license": "",
+  "keywords": [],
+  "description": "",
+  "source": "src"
+}

crates/moon/tests/test_cases/general.in/src/lib/hello.mbt

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+pub fn hello() -> String {
+  "Hello, world!"
+}

crates/moon/tests/test_cases/general.in/src/lib/hello_test.mbt

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+test "hello" {
+  if @lib.hello() != "Hello, world!" {
+    fail!("@lib.hello() != \"Hello, world!\"")
+  }
+}

crates/moon/tests/test_cases/general.in/src/lib/moon.pkg.json

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+{}

crates/moon/tests/test_cases/general.in/src/main/main.mbt

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+fn main {
+  println(@lib.hello())
+}

crates/moon/tests/test_cases/general.in/src/main/moon.pkg.json

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+{
+  "is-main": true,
+  "import": [
+    "username/hello/lib"
+  ]
+}