Test detection of Mbed Studio version of ARMC6

Author: bridadan

tools/test/toolchains/api_test.py

@@ -92,7 +92,33 @@ def test_armc6_version_check(_run_cmd):
     """, "", 0)
 
     toolchain.version_check()
-    assert notifier.messages == []   
+    assert notifier.messages == []
+    assert not toolchain.is_mbed_studio_armc6
+
+    _run_cmd.return_value = ("""
+    armclang: error: Failed to check out a license.
+    The provided license does not enable these tools.
+    Information about this error is available at: http://ds.arm.com/support/lic56/m5
+     General licensing information is available at: http://ds.arm.com/support/licensing/
+     If you need further help, provide this complete error report to your supplier or license.support@arm.com.
+     - ARMLMD_LICENSE_FILE: unset
+     - LM_LICENSE_FILE: unset
+     - ARM_TOOL_VARIANT: unset
+     - ARM_PRODUCT_PATH: unset
+     - Product location: C:\MbedStudio\tools\ac6\sw\mappings
+     - Toolchain location: C:\MbedStudio\tools\ac6\bin
+     - Selected tool variant: product
+     - Checkout feature: mbed_armcompiler
+     - Feature version: 5.0201810
+     - Flex error code: -5
+    Product: ARM Compiler 6.11 for Mbed Studio
+    Component: ARM Compiler 6.11
+    Tool: armclang [5d3b3c00]
+    """, "", 0)
+
+    toolchain.version_check()
+    assert notifier.messages == []
+    assert toolchain.is_mbed_studio_armc6
 
 @patch('tools.toolchains.iar.run_cmd')
 def test_iar_version_check(_run_cmd):