Fix namespaces for Tests

field names are OK

all tests are placed into anonymous namespace to prevent them from being executed from the outside of test environment. a common practice for gtest

Introduced AnalysisTree::Test::Base

.idea/vcs.xml

@@ -2,7 +2,6 @@
 <project version="4">
   <component name="VcsDirectoryMappings">
     <mapping directory="$PROJECT_DIR$" vcs="Git" />
-    <mapping directory="$PROJECT_DIR$/cmake-build-debug" vcs="Git" />
     <mapping directory="$PROJECT_DIR$/cmake-build-debug/googletest-src" vcs="Git" />
   </component>
 </project>
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