Add test for Genie with multiple and mixed sources

test cases/vala/20 genie multiple mixed sources/c_test_one.c

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+#include <glib.h>
+
+gboolean c_test_one_is_true (void) {
+    return TRUE;
+}

test cases/vala/20 genie multiple mixed sources/c_test_two.c

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+#include <glib.h>
+
+gboolean c_test_two_is_true (void) {
+    return TRUE;
+}

test cases/vala/20 genie multiple mixed sources/init.gs

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+def extern c_test_one_is_true():bool
+def extern c_test_two_is_true():bool
+
+init
+	assert( new Genie.TestOne().is_true() )
+	assert( new Genie.TestTwo().is_true() )
+	assert( new Vala.TestOne().is_true() )
+	assert( new Vala.TestTwo().is_true() )
+	assert( c_test_one_is_true() )
+	assert( c_test_two_is_true() )
+

test cases/vala/20 genie multiple mixed sources/meson.build

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+project( 'Genie multiple and mixed sources', 'vala', 'c' )
+
+genie_deps = [
+    dependency( 'glib-2.0' ),
+    dependency( 'gobject-2.0' ),
+]
+
+sources = [
+    'init.gs',
+    'test_one.gs',
+    'test_two.gs',
+    'vala_test_one.vala',
+    'vala_test_two.vala',
+    'c_test_one.c',
+    'c_test_two.c',
+]
+
+prog = executable( 'genie_prog', sources, dependencies: genie_deps )
+test( 'Given a Genie program when it is compiled from multiple mixed sources then it should work', prog )

test cases/vala/20 genie multiple mixed sources/test_one.gs

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+namespace Genie
+
+	class TestOne
+		def is_true():bool
+			return true

test cases/vala/20 genie multiple mixed sources/test_two.gs

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+namespace Genie
+
+	class TestTwo
+		def is_true():bool
+			return true

test cases/vala/20 genie multiple mixed sources/vala_test_one.vala

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+namespace Vala {
+    public class TestOne {
+        public bool is_true() {
+            return true;
+        }
+    }
+}

test cases/vala/20 genie multiple mixed sources/vala_test_two.vala

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+namespace Vala {
+    public class TestTwo {
+        public bool is_true() {
+            return true;
+        }
+    }
+}