Improve tools/unit_tests.py (#958)

Checks the output more carefully. The first line of output from
js/unit_tests.ts should be something like "running 96 tests"
And the last line should be something like
"test result: ok. 96 passed; 0 failed; 0 ignored; 0 measured; 36
filtered out"
This parses those strings and make sure they align.

This will catch silent death bugs.

1 files changed, 71 insertions, 0 deletions

diff --git a/tools/testdata/unit_test_output2.txt b/tools/testdata/unit_test_output2.txt
new file mode 100644
index 000000000..5913d3b90
--- /dev/null
+++ b/tools/testdata/unit_test_output2.txt
@@ -0,0 +1,71 @@
+running 96 tests
+test permSerialization_permW0N0E0
+... ok
+test permFromStringThrows_permW0N0E0
+... ok
+test compilerInstance_permW0N0E0
+... ok
+test compilerRun_permW0N0E0
+Compiling /root/project/foo/bar.ts
+... ok
+test compilerRunMultiModule_permW0N0E0
+... ok
+test compilerRunCircularDependency_permW0N0E0
+Compiling modA
+Compiling modB
+... ok
+test compilerResolveModule_permW0N0E0
+... ok
+test compilerGetModuleDependencies_permW0N0E0
+... ok
+test compilerGetCompilationSettings_permW0N0E0
+... ok
+test compilerGetNewLine_permW0N0E0
+... ok
+test compilerGetScriptFileNames_permW0N0E0
+Compiling /root/project/foo/bar.ts
+... ok
+test compilerRecompileFlag_permW0N0E0
+Compiling /root/project/foo/bar.ts
+Compiling /root/project/foo/bar.ts
+... ok
+test compilerGetScriptKind_permW0N0E0
+... ok
+test compilerGetScriptVersion_permW0N0E0
+Compiling /root/project/foo/bar.ts
+... ok
+test compilerGetScriptVersionUnknown_permW0N0E0
+... ok
+test compilerGetScriptSnapshot_permW0N0E0
+... ok
+test compilerGetCurrentDirectory_permW0N0E0
+... ok
+test compilerGetDefaultLibFileName_permW0N0E0
+... ok
+test compilerUseCaseSensitiveFileNames_permW0N0E0
+... ok
+test compilerReadFile_permW0N0E0
+... ok
+test compilerFileExists_permW0N0E0
+... ok
+test compilerResolveModuleNames_permW0N0E0
+... ok
+test consoleTestAssert_permW0N0E0
+... ok
+test consoleTestStringifyComplexObjects_permW0N0E0
+... ok
+test consoleTestStringifyCircular_permW0N0E0
+... ok
+test consoleTestStringifyWithDepth_permW0N0E0
+... ok
+test consoleTestError_permW0N0E0
+... ok
+test consoleDetachedLog_permW0N0E0
+Hello world
+Hello world
+Hello world
+Hello world
+Hello world
+Hello world
+... ok
+test fetchPerm_permW0N0E0