add comparator test

Author: David Ungar

test/Driver/Dependencies/Inputs/range-sourcecomparator/in6.compiledsource

@@ -0,0 +1,4 @@
+
+    }
+    }
+    }

test/Driver/Dependencies/Inputs/range-sourcecomparator/in6.swift

@@ -0,0 +1,5 @@
+f
+    }
+    }
+    }
+

test/Driver/Dependencies/Inputs/range-sourcecomparator/in6.swiftranges

@@ -0,0 +1,5 @@
+### Swift source ranges file v0 ###
+---
+unparsedRangesByNonPrimary: {}
+noninlinableFunctionBodies: []
+...

test/Driver/Dependencies/Inputs/range-sourcecomparator/output.json

@@ -19,6 +19,10 @@
     "object": "./in5.o",
     "swift-dependencies": "./in5.swiftdeps"
   },
+  "./in6.swift": {
+    "object": "./in6.o",
+    "swift-dependencies": "./in6.swiftdeps"
+  },
   "": {
     "swift-dependencies": "./main~buildrecord.swiftdeps"
   }

test/Driver/Dependencies/range-sourcecomparator.swift

@@ -1,15 +1,25 @@
 // Tests the diff algorithm (the SourceComparator) used for range-based
 // incremental compilation.
+//
+// If you try to add inputs, be sure to update output.json and add a swiftranges
+// input.
 
 // Copy in the inputs.
-// The lack of a build record or swiftdeps files should disable incremental compilation
+
 
 // Ensure that the extra outputs are not generated when they should not be:
 // RUN: %empty-directory(%t)
 // RUN: cp -r %S/Inputs/range-sourcecomparator/* %t
-// RUN: cd %t && %swiftc_driver -output-file-map %t/output.json -incremental -c ./in1.swift ./in2.swift ./in3.swift ./in4.swift ./in5.swift -module-name main -incremental -enable-source-range-dependencies -driver-dump-compiled-source-diffs -driver-skip-execution >& output
 
-// RUN: %FileCheck  %s <%t/output --match-full-lines
+// The lack of a build record or swiftdeps files should disable incremental compilation
+// So, do one run just to build the build record
+
+// RUN: cd %t && %swiftc_driver -output-file-map %t/output.json -incremental -c ./in1.swift ./in2.swift ./in3.swift ./in4.swift ./in5.swift ./in6.swift -module-name main -incremental -enable-source-range-dependencies -driver-dump-compiled-source-diffs -driver-skip-execution -driver-compare-incremental-schemes >& output
+
+// RUN: cd %t && %swiftc_driver -output-file-map %t/output.json -incremental -c ./in1.swift ./in2.swift ./in3.swift ./in4.swift ./in5.swift ./in6.swift -module-name main -incremental -enable-source-range-dependencies -driver-dump-compiled-source-diffs -driver-skip-execution -driver-compare-incremental-schemes >& output1
+
+
+// RUN: %FileCheck  %s <%t/output1 --match-full-lines
 // CHECK: *** all changed ranges in 'in1.swift' (w.r.t previously-compiled) ***
 // CHECK-NEXT: - [2:1--2:15)
 // CHECK-NEXT: *** all changed ranges in 'in1.swift' (w.r.t to-be-compiled) ***