Add test failure annotations on v1.8+ (#58)

Co-authored-by: Dilum Aluthge <dilum@aluthge.com>

test_logger_tests.jl

@@ -0,0 +1,71 @@
+include("test_logger.jl")
+using Logging, Test
+
+function simulate(text)
+    logger = Test.TestLogger()
+    output = IOBuffer()
+    with_logger(logger) do
+        stream, t = TestLogger.build_stream(output)
+        for line in eachline(IOBuffer(text); keep=true)
+            write(stream, line)
+        end
+        close(stream)
+        wait(t)
+    end
+    return String(take!(output)), logger.logs
+end
+
+@testset "TestLogger" begin
+
+    for input in (
+            """
+            Test Failed at file.txt:1
+            1
+            2
+            3
+            4
+            5
+            6
+            Stacktrace:
+            Hi
+            """,
+            # Let us mess with the stacktrace line
+            """
+            Test Failed at file.txt:1
+            1
+            2
+            3
+            4
+            5
+            6
+               Stacktrace:   extra stuff
+            Hi
+            """)
+
+        output, logs = simulate(input)
+        @test output == input
+        log = only(logs)
+        @test log.message == "Test Failed\n1\n2\n3\n4\n5\n6"
+        @test log.file == "file.txt"
+        @test log.line == "1"
+    end
+
+    # Next, check that if we hit a Test Failed, and then hit another one before we get a stacktrace,
+    # we just move on to handling the new one.
+    input = """
+    Test Failed at file.txt:1
+    Nah
+    Test Failed at file.txt:1
+    Correct
+    Stacktrace:
+    Hi
+    """
+
+    output, logs = simulate(input)
+    @test output == input
+
+    log = only(logs)
+    @test log.message == "Test Failed\nCorrect"
+    @test log.file == "file.txt"
+    @test log.line == "1"
+end