Ruby: add some integration tests for diagnostic messages

ruby/ql/integration-tests/all-platforms/diagnostics/syntax-error/bad.rb

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+4 %%% 5
+
+if 1; 2

ruby/ql/integration-tests/all-platforms/diagnostics/syntax-error/diagnostics.expected

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+{
+  "helpLinks": [
+    "https://docs.github.com/en/code-security/code-scanning/automatically-scanning-your-code-for-vulnerabilities-and-errors/customizing-code-scanning"
+  ],
+  "location": {
+    "endColumn": 5,
+    "endLine": 1,
+    "file": "<test-root-directory>/bad.rb",
+    "startColumn": 4,
+    "startLine": 1
+  },
+  "markdownMessage": "A parse error occurred. Check the syntax of the file. If the file is invalid, correct the error or [exclude](https://docs.github.com/en/code-security/code-scanning/automatically-scanning-your-code-for-vulnerabilities-and-errors/customizing-code-scanning) the file from analysis.",
+  "plaintextMessage": "A parse error occurred. Check the syntax of the file. If the file is invalid, correct the error or exclude the file from analysis.",
+  "severity": "Error",
+  "source": {
+    "extractorName": "ruby",
+    "id": "ruby/parse-error",
+    "name": "Parse error"
+  },
+  "visibility": {
+    "statusPage": true
+  }
+}
+{
+  "helpLinks": [
+    "https://docs.github.com/en/code-security/code-scanning/automatically-scanning-your-code-for-vulnerabilities-and-errors/customizing-code-scanning"
+  ],
+  "location": {
+    "endColumn": 7,
+    "endLine": 3,
+    "file": "<test-root-directory>/bad.rb",
+    "startColumn": 8,
+    "startLine": 3
+  },
+  "markdownMessage": "A parse error occurred (expected `end` symbol). Check the syntax of the file. If the file is invalid, correct the error or [exclude](https://docs.github.com/en/code-security/code-scanning/automatically-scanning-your-code-for-vulnerabilities-and-errors/customizing-code-scanning) the file from analysis.",
+  "plaintextMessage": "A parse error occurred (expected end symbol). Check the syntax of the file. If the file is invalid, correct the error or exclude the file from analysis.",
+  "severity": "Error",
+  "source": {
+    "extractorName": "ruby",
+    "id": "ruby/parse-error",
+    "name": "Parse error"
+  },
+  "visibility": {
+    "statusPage": true
+  }
+}

ruby/ql/integration-tests/all-platforms/diagnostics/syntax-error/test.py

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+import os
+from create_database_utils import *
+from diagnostics_test_utils import *
+
+run_codeql_database_create([], lang="ruby", runFunction = runSuccessfully, db = None)
+
+check_diagnostics()

ruby/ql/integration-tests/all-platforms/diagnostics/unknown-encoding/diagnostics.expected

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+{
+  "helpLinks": [
+    "https://docs.ruby-lang.org/en/master/syntax/comments_rdoc.html#label-encoding+Directive"
+  ],
+  "location": {
+    "file": "<test-root-directory>/encoding.rb"
+  },
+  "markdownMessage": "Unknown character encoding `silly` in `#encoding:` [directive](https://docs.ruby-lang.org/en/master/syntax/comments_rdoc.html#label-encoding+Directive).",
+  "plaintextMessage": "Unknown character encoding silly in #encoding: directive.",
+  "severity": "Warning",
+  "source": {
+    "extractorName": "ruby",
+    "id": "ruby/unknown-character-encoding",
+    "name": "Unknown character encoding"
+  },
+  "visibility": {
+    "statusPage": true
+  }
+}

ruby/ql/integration-tests/all-platforms/diagnostics/unknown-encoding/encoding.rb

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+# encoding: silly
+
+def f
+  puts "hello"
+end

ruby/ql/integration-tests/all-platforms/diagnostics/unknown-encoding/test.py

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+import os
+from create_database_utils import *
+from diagnostics_test_utils import *
+
+run_codeql_database_create([], lang="ruby", runFunction = runSuccessfully, db = None)
+
+check_diagnostics()

ruby/ql/integration-tests/all-platforms/qlpack.yml

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+dependencies:
+  codeql/ruby-all: '*'
+  codeql/ruby-queries: '*'