_Default value_: Not null
+
The Groovy source files of this source set. Contains all `.groovy` and `.java` files found in the Groovy source directories, and excludes all other types of files.

`groovy.srcDirs` — `Set<File>`::
_Default value_: `[__projectDir__/src/__name__/groovy]`
+

	SYS_VMM_GUEST_CTL          = 534 // { int vmm_guest_ctl(int op, struct vmm_guest_options *options); }
	SYS_VMM_GUEST_SYNC_ADDR    = 535 // { int vmm_guest_sync_addr(long *dstaddr, long *srcaddr); }
	SYS_PIPE2                  = 538 // { int pipe2(int *fildes, int flags); }
	SYS_UTIMENSAT              = 539 // { int utimensat(int fd, const char *path, const struct timespec *ts, int flags); }

[source,groovy]
----
// Define a source set named 'test' for test sources
sourceSets {
    test {
        java {
            srcDirs = ['src/test/java']
        }
    }
}
// Specify a test implementation dependency on JUnit
dependencies {
    testImplementation 'junit:junit:4.12'
}
----

The Java source files of this source set. Contains only `.java` files found in the Java source directories, and excludes all other files.

`java.srcDirs` — `Set<File>`::
_Default value_: `src/$name/java`, e.g. _src/main/java_
+

The Scala source files of this source set. Contains all `.scala` and `.java` files found in the Scala source directories, and excludes all other types of files. _Default value:_ non-null.

`scala.srcDirs` — `Set<File>`::
The source directories containing the Scala source files of this source set. May also contain Java source files for joint compilation.

	SYS_VMM_GUEST_CTL          = 534 // { int vmm_guest_ctl(int op, struct vmm_guest_options *options); }
	SYS_VMM_GUEST_SYNC_ADDR    = 535 // { int vmm_guest_sync_addr(long *dstaddr, long *srcaddr); }
	SYS_PROCCTL                = 536 // { int procctl(idtype_t idtype, id_t id, int cmd, void *data); }
	SYS_CHFLAGSAT              = 537 // { int chflagsat(int fd, const char *path, u_long flags, int atflags);}

<2> Configure the `sources` of the test suite.
<3> Configure the `java` SourceDirectorySet of the test suite.
<4> Overwrite the `srcDirs` property, replacing the conventional `src/integrationTest/java` location with `src/it/java`.

== Configure the type of a test suite

====

include::sample[dir="snippets/java/customDirs/groovy",files="build.gradle[tags=custom-extra-src-dir]"]
====

Crucially, we're using the _method_ `srcDir()` here to append a directory path, whereas setting the `srcDirs` property replaces any existing values. This is a common convention in Gradle: setting a property replaces values, while the corresponding method appends values.

			// for c:\program files.
			continue
		}
		all = append(all, p)
	}
	return all
}

// SrcDirs returns a list of package source root directories.
// It draws from the current Go root and Go path but omits directories
// that do not exist.
func (ctxt *Context) SrcDirs() []string {
	var all []string
	if ctxt.GOROOT != "" && ctxt.Compiler != "gccgo" {
		dir := ctxt.joinPath(ctxt.GOROOT, "src")

		{"Visitor", Type, 0},
		{"Walk", Func, 0},
	},
	"go/build": {
		{"(*Context).Import", Method, 0},
		{"(*Context).ImportDir", Method, 0},
		{"(*Context).MatchFile", Method, 2},
		{"(*Context).SrcDirs", Method, 0},
		{"(*MultiplePackageError).Error", Method, 4},
		{"(*NoGoError).Error", Method, 0},
		{"(*Package).IsCommand", Method, 0},
		{"AllowBinary", Const, 0},
		{"ArchChar", Func, 0},